BONDED ABRASIVES FORMED BY UNIAXIAL HOT PRESSING

• US 20130081334A1
• Filed: 09/28/2012
• Published: 04/04/2013
• Est. Priority Date: 09/29/2011
• Status: Abandoned Application

• Current Assignee: Saint-Gobain Abrasives Incorporated (Compagnie De Saint-Gobain), Saint-Gobain Abrasifs (Compagnie de Saint-Gobain SA)
• Original Assignee: Saint-Gobain Abrasives Incorporated (Compagnie De Saint-Gobain), Saint-Gobain Abrasifs (Compagnie de Saint-Gobain SA)
• Inventors: Hoang, Marc Linh
• Application Number:
  US13/631,372
• Publication Number:
  US 20130081334A1
• Time in Patent Office: Days
• US Class Current: 51/296
• CPC Class Codes: B22F 2003/145 by warm compacting, below debindering temperature
• CPC Class Codes: B22F 3/1035 Liquid phase sintering
• CPC Class Codes: B22F 3/14 simultaneously
• CPC Class Codes: B24D 18/0009 using moulds or presses
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3229 Cerium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3418 Silicon oxide, silicic acids or oxide forming salts thereof, e.g. silica sol, fused silica, silica fume, cristobalite, quartz or flint
• CPC Class Codes: C04B 2235/3826 Silicon carbides
• CPC Class Codes: C04B 2235/386 Boron nitrides
• CPC Class Codes: C04B 2235/427 Diamond
• CPC Class Codes: C04B 2235/48 Organic compounds becoming part of a ceramic after heat treatment, e.g. carbonising phenol resins
• CPC Class Codes: C04B 2235/604 Pressing at temperatures other than sintering temperatures
• CPC Class Codes: C04B 2235/608 Green bodies or pre-forms with well-defined density
• CPC Class Codes: C04B 2235/77 Density
• CPC Class Codes: C04B 35/528 obtained from carbonaceous particles with or without other non-organic components
• CPC Class Codes: C04B 35/5831 based on cubic boron nitrides or Wurtzitic boron nitrides, including crystal structure transformation of powder
• CPC Class Codes: C04B 35/6303 Inorganic additives
• CPC Class Codes: C04B 35/645 Pressure sintering
• CPC Class Codes: C04B 35/80 Fibres, filaments, whiskers, platelets, or the like
• CPC Class Codes: C22C 2026/003 Cubic boron nitrides only
• CPC Class Codes: C22C 2026/005 : with additional metal compounds being borides
• CPC Class Codes: C22C 2026/006 : with additional metal compounds being carbides
• CPC Class Codes: C22C 2026/007 : with additional metal compounds being nitrides
• CPC Class Codes: C22C 2026/008 : with additional metal compounds other than carbides, borides or nitrides
• CPC Class Codes: C22C 26/00 : Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
• CPC Class Codes: C22C 32/0005 : with at least one oxide and at least one of carbides, nitrides, borides or silicides as the main non-metallic constituents
• CPC Class Codes: C22C 32/001 : with only oxides
• CPC Class Codes: C22C 32/0015 : with only single oxides as main non-metallic constituents
• CPC Class Codes: C22C 32/0047 : with carbides, nitrides, borides or silicides as the main non-metallic constituents

Abstract

A particular method includes uniaxially hot pressing a preform that includes abrasive particles in a bonding material to form a bonded abrasive body.

Claims

1. A method of forming a bonded abrasive body comprising:

uniaxially hot pressing a preform comprising abrasive particles in a bonding material to form a bonded abrasive body.

2. The method of claim 1, wherein during uniaxially hot pressing, the geometry of the preform is substantially altered.

3. The method of claim 1, wherein uniaxially hot pressing comprises liquid phase sintering.

6. The method of claim 1, further comprising uniaxially hot pressing in one of an oxidizing atmosphere, a reducing atmosphere, or an inert atmosphere.

33. The method of claim 1, further comprising forming a green body preform comprising abrasive particles and a bonding material.

35. The method of claim 1, wherein the preform comprises about 20-60 vol % porosity.

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39. A method of forming a body comprising:

uniaxially hot pressing a preform comprising abrasive particles to form a body having a relief extending from a plane which extends parallel to an axis of pressing.

40. The method of claim 39, further comprising forming the body such that the final shape of the body is asymmetric around the axis of pressing, and wherein the plane defines an exterior surface of the body.

42. The method of claim 39, wherein uniaxially hot pressing comprises forming a relief in the body during pressing, wherein the relief extends at an angle to the axis of pressing.

48. The method of claim 39, further comprising uniaxially hot pressing at a temperature within a range of about 600°

C. (1112°

F.) to about 1100°

C. (2012°

F.).

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88. A method of forming a composite body comprising:

uniaxially hot pressing a green body preform to form a composite body, wherein pressing comprises liquid phase sintering and wherein during pressing the geometry of the preform is substantially altered.

90. The method of claim 88, wherein during pressing an extension is formed protruding from a surface of the composite body.

91. The method of claim 90, wherein the extension extends from a surface of the body at an angle to an axis of pressing.

95. The method of claim 88, wherein pressing comprises uniaxially hot pressing at a temperature within a range of about 600°

C. (1112°

F.) to about 1100°

C. (2012°

F.).

97. The method of claim 88, further comprising pressing in one of an oxidizing atmosphere, a reducing atmosphere, or an inert atmosphere.

99. The method of claim 88, further comprising placing the green body preform in a mold prior to pressing.

106. The method of claim 99, further comprising providing a mold pack within a die wherein the mold pack comprises a plurality of molds and a plurality of green body preforms.

107. The method of claim 106, wherein providing a mold pack within a die comprises loading a mold of the plurality of molds with a green body preform of the plurality of green body preforms.

108. The method of claim 106, further comprising uniaxially hot pressing the mold pack.

109. The method of claim 88, further comprising pressing at least two green body preforms simultaneously.

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