Agglomerate abrasive grain and a method of making the same
First Claim
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1. Agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, and wherein the abrasive particles have an average particle size of at least 5 micrometers.
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Accused Products
Abstract
Agglomerate abrasive grain is disclosed. The agglomerate abrasive grain can be incorporated into abrasive products such as coated abrasives, bonded abrasives, nonwoven abrasives, and abrasive brushes. A method of making agglomerate abrasive grain is also disclosed.
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Citations
210 Claims
- 1. Agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, and wherein the abrasive particles have an average particle size of at least 5 micrometers.
- 22. Agglomerate abrasive grain comprising a plurality of polycrystalline abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, the abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent.
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37. A method for making agglomerate abrasive grain comprising:
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contacting a plurality of at least one of abrasive particles or precursor abrasive particles with a precursor bonding material such that the particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to convert the agglomerated particles, into agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered bonding material;
wherein the sintered bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on the total metal oxide content of the bonding material; and
wherein the abrasive particles of the agglomerate abrasive grain have an average particle size of at least 5 micrometers.- View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50)
drying the agglomerated particles;
calcining the dried agglomerated particles to provide porous agglomerated particles; and
impregnating the porous agglomerated particles with a composition comprising water and at least one of metal oxide or metal oxide precursor.
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44. The method according to claim 37, wherein the average particle size of the particles is at least 25 micrometers.
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45. The method according to claim 37, wherein the average particle size of the particles is at least 100 micrometers.
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46. The method according to claim 37, wherein the abrasive particles are comprised of crystals having an average crystal size less than 10 micrometers.
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47. The method according to claim 37, wherein the abrasive particles include sintered, crystalline ceramic alpha alumina-based abrasive particles.
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48. The method according to claim 37, wherein the bonding material and the sintered, ceramic alpha alumina-based abrasive particles have substantially the same composition.
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49. The method according to claim 37, wherein the bonding material and the sintered, ceramic alpha alumina-based abrasive particles have substantially the same composition and microstructure.
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50. The method according to claim 37, wherein the abrasive particles of the agglomerate abrasive grain have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 30 percent.
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51. A method for making agglomerate abrasive grain comprising:
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contacting a plurality of at least one of abrasive particles or precursor abrasive particles with a precursor bonding material such that the particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to convert the agglomerated particles into agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered bonding material;
wherein the sintered bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on the total metal oxide content of the bonding material; and
wherein the heat-treated abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent.- View Dependent Claims (52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 69)
drying the agglomerated particles;
calcining the dried agglomerated particles to provide porous agglomerated particles; and
impregnating the porous agglomerated particles with a composition comprising water and at least one of metal oxide or metal oxide precursor.
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58. The method according to claim 51, wherein the average particle size of the particles is at least 25 micrometers.
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59. The method according to claim 51, wherein the average particle size of the particles is at least 100 micrometers.
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60. The method according to claim 51, wherein the abrasive particles are comprised of crystals having an average crystal size less than 10 micrometers.
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61. The method according to claim 51, wherein the abrasive particles include sintered, crystalline ceramic alpha alumina-based abrasive particles.
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62. The method according to claim 51, wherein the bonding material and the sintered, ceramic alpha alumina-based abrasive particles have substantially the same composition.
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63. The method according to claim 51, the bonding material and the sintered, ceramic alpha alumina-based abrasive particles have substantially the same composition and microstructure.
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64. The method according to claim 51, wherein the abrasive particles have a density of at least 95% of theoretical density.
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65. The method according to claim 51, wherein the abrasive grain has a porosity value of at least 30 percent.
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69. The agglomerate abrasive grain according to claim 54, wherein the bonding material comprises, on a theoretical oxide basis, at least 95 percent by weight Al2O3, based on the total metal oxide content of the bonding material.
- 66. Agglomerate abrasive grain comprising a plurality of sintered polycrystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles have substantially the same volume.
- 74. Agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size.
- 83. Agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein said agglomerate abrasive grain comprises, on a theoretical oxide basis, at least 85% by weight Al2O3, based on the total metal oxide content of the agglomerate abrasive grain, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size.
- 95. Agglomerate abrasive grain comprising a plurality of sintered, polycrystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein the agglomerate abrasive grain has a porosity value in the range from 10 to about 60 percent.
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107. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein at least three of the largest abrasive particles have substantially the same volume, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain. - View Dependent Claims (108, 109, 110, 111, 112, 113, 114, 115)
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116. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein at least three of the largest abrasive particles have substantially the same volume, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together;
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles;
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor; and
heating the impregnated, agglomerated precursor particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain.
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117. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain. - View Dependent Claims (118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133)
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles; and
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor.
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128. The method according to claim 127, wherein the liquid comprises water.
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129. The method according to claim 127, wherein the liquid comprises acidified water.
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130. The method according to claim 127, wherein the liquid comprises water and metal oxide precursor.
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131. The method according to claim 130, wherein the metal oxide precursor is a metal nitrate salt in solution.
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132. The method according to claim 127, wherein the liquid comprises water and metal oxide precursor selected from the group consisting of chromium nitrate, cobalt nitrate, dysprosium nitrate, erbium nitrate, europium nitrate, ferric nitrate, gadolinium nitrate, lanthanum nitrate, lithium nitrate, magnesium nitrate, manganese nitrate, neodymium nitrate, nickel nitrate, praseodymium nitrate, samarium nitrate, yttrium nitrate, zinc nitrate, zirconium hydroxynitrate, zirconium nitrate, zirconium oxynitrate, and combinations thereof in solution.
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133. The method according to claim 127, wherein contacting the dried, boehmite-based precursor particles in the presence of liquid includes rotating the particles in the presence of the liquid with a disc agglomerator.
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134. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together;
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles;
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor; and
heating the impregnated, agglomerated precursor particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain.
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135. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein said agglomerate abrasive grain comprises, on a theoretical oxide basis, at least 85% by weight alumina, based on the total metal oxide content of the agglomerate abrasive grain, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to provide the agglomerate abrasive grain. - View Dependent Claims (136, 137, 138, 139, 140, 141, 142, 143, 144, 145)
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles; and
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor.
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146. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein said agglomerate abrasive grain comprises, on a theoretical oxide basis, at least 85% by weight alumina, based on the total metal oxide content of the agglomerate abrasive grain, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together;
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles;
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor; and
heating the impregnated, agglomerated precursor particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain.
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147. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein said agglomerate abrasive grain has a porosity value in the range from 10 to 60 percent, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain. - View Dependent Claims (148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161)
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles; and
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor.
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162. A method for making agglomerate abrasive grain comprising a plurality of sintered, crystalline, alpha alumina-based abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein said agglomerate abrasive grain has a porosity value in the range from 10 to 60 percent, said method comprising:
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contacting dried, boehmite-based precursor particles in the presence of liquid such that a plurality of said precursor particles agglomerate together;
drying the agglomerated precursor particles;
calcining the dried agglomerated precursor particles to provide porous agglomerated precursor particles;
impregnating the porous agglomerated precursor particles with a composition comprising liquid and at least one of metal oxide or metal oxide precursor; and
heating the impregnated, agglomerated precursor particles at at least one temperature for a time sufficient to provide said agglomerate abrasive grain.
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163. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, and wherein the abrasive particles have an average particle size of at least 5 micrometers, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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164. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of polycrystalline abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, the abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain. - View Dependent Claims (165)
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166. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a, plurality of sintered polycrystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles have substantially the same volume, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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167. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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168. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein said agglomerate abrasive grain comprises, on a theoretical oxide basis, at least 85% by weight Al2O3, based on the total metal oxide content of the agglomerate abrasive grain, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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169. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of sintered, polycrystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein the agglomerate abrasive grain has a porosity value in the range from 10 to about 60 percent, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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170. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, and wherein the abrasive particles have an average particle size of at least 5 micrometers, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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- 171. Agglomerate abrasive grain comprising a plurality of sintered, crystalline alpha alumina-based abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, the abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent.
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176. A method for making agglomerate abrasive grain comprising:
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contacting a plurality of abrasive particles with a precursor bonding material such that the particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to convert the agglomerated particles, into agglomerate abrasive grain comprising a plurality of sintered, crystalline alpha alumina-based abrasive particles bonded together with a sintered bonding material;
wherein the sintered bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on the total metal oxide content of the bonding material; and
wherein the abrasive particles of the agglomerate abrasive grain have an average particle size of at least 5 micrometers.- View Dependent Claims (177, 178, 179, 180, 181, 182)
drying the agglomerated particles;
calcining the dried agglomerated particles to provide porous agglomerated particles; and
impregnating the porous agglomerated particles with a composition comprising water and at least one of metal oxide or metal oxide precursor.
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180. The method according to claim 176, wherein the average particle size of the particles is at least 25 micrometers.
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181. The method according to claim 176, wherein the abrasive particles include sintered, crystalline alpha alumina-based abrasive particles.
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182. The method according to claim 176, wherein the bonding material and the sintered alpha alumina-based abrasive particles have substantially the same composition.
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183. A method for making agglomerate abrasive grain comprising:
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contacting a plurality of abrasive particles with a precursor bonding material such that the particles agglomerate together; and
heating the agglomerated particles at at least one temperature for a time sufficient to convert the agglomerated particles into agglomerate abrasive grain comprising a plurality of sintered, crystalline alpha alumina-based abrasive particles bonded together with a sintered bonding material;
wherein the sintered bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on the total metal oxide content of the bonding material; and
wherein the heat-treated abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent.- View Dependent Claims (184, 185, 186, 187, 188, 189, 190, 191)
drying the agglomerated particles;
calcining the dried agglomerated particles to provide porous agglomerated particles; and
impregnating the porous agglomerated particles with a composition comprising water and at least one of metal oxide or metal oxide precursor.
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188. The method according to claim 187, wherein the average particle size of the particles is at least 25 micrometers.
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189. The method according to claim 187, wherein the abrasive particles are comprised of crystals having an average crystal size less than 10 micrometers.
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190. The method according to claim 187, wherein the bonding material and the sintered, crystalline alpha alumina-based abrasive particles have substantially the same composition.
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191. The method according to claim 187, wherein the abrasive grain has a porosity value of at least 30 percent.
- 192. Agglomerate abrasive grain comprising a plurality of sintered crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles have substantially the same volume.
- 196. Agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, wherein the crystalline abrasive particles are comprised of crystals having an average size less than 10 micrometers, and wherein at least three of the largest abrasive particles are greater than 20 micrometers in size.
- 200. Agglomerate abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together via crystalline ceramic, metal oxide bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight Al2O3, based on the total metal oxide content of the bonding material, and wherein the agglomerate abrasive grain has a porosity value in the range from 10 to about 60 percent.
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207. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, wherein the abrasive particles have an average particle size of at least 5 micrometers, and wherein the abrasive particles comprises at least one of fused aluminum oxide abrasive particles, silicon carbide abrasive particles, boron carbide abrasive particles, titanium carbide abrasive particles, diamond abrasive particles, cubic boron nitride abrasive particles, garnet, or fused alumina-zirconia abrasive particles, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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208. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain comprising a plurality of fused abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, and wherein the abrasive particles have an average particle size of at least 5 micrometers, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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209. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain abrasive grain comprising a plurality of sintered, crystalline abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, the abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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210. A method of abrading a surface, said method comprising:
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contacting at least agglomerate abrasive grain abrasive grain comprising a plurality of fused, polycrystalline abrasive particles bonded together with a sintered, crystalline ceramic bonding material, wherein the bonding material comprises, on a theoretical oxide basis, at least 50 percent by weight crystalline Al2O3, based on a total metal oxide content of the bonding material, the abrasive particles have a density of at least 85% of theoretical density, and the agglomerate abrasive grain has a porosity value of at least 10 percent, with a surface of a workpiece; and
moving at least of one said agglomerate abrasive grain or said surface relative to the other to abrade at least a portion of said surface with said agglomerate abrasive grain.
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Specification