High density alumina zirconia ceramics and a process for production thereof
First Claim
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1. A high density alumina-zirconia ceramic body, the formulation of which comprises alumina ranging from 60 mol percent to 99 mol prcent;
- zirconia, wherein more than 65 percent of said zirconia is in the tetragonal phase, ranging from 1 mol percent to 40 mol percent; and
, an oxide of at least one transition metal element selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Zn, in an amount that said transition metal atom to Al and Zr ranges from 0.01 to 1 percent.
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Abstract
A process for the production of a sinterable raw material powder to be used for the production of a partially stabilized ZrO2 sintered body or ceramic body containing 0 to 60 parts of alumina, and the process for the production of the sintered body or ceramic body using this powder.
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7 Claims
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1. A high density alumina-zirconia ceramic body, the formulation of which comprises alumina ranging from 60 mol percent to 99 mol prcent;
- zirconia, wherein more than 65 percent of said zirconia is in the tetragonal phase, ranging from 1 mol percent to 40 mol percent; and
, an oxide of at least one transition metal element selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Zn, in an amount that said transition metal atom to Al and Zr ranges from 0.01 to 1 percent. - View Dependent Claims (2, 3, 4, 6)
- zirconia, wherein more than 65 percent of said zirconia is in the tetragonal phase, ranging from 1 mol percent to 40 mol percent; and
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5. A process for the production of a high density alumina-zirconia ceramic body, the formulation of which comprises alumina ranging from 60 mol percent to 99 mol percent;
- zirconia, wherein more than 65 percent of said zirconia is in the tetragonal phase, wanging from 1 mol percent to 40 mol percent and an oxide of at least one transition metal element selected from the group consisting of Mn, Fe, Co, Ni, Cu and Zn in an amount that said transition metal atom to Al and Zr ranges from 0.01 to 1 percent, which comprises the steps of
(a) mixing the following (i), (ii), and (iii) (i) alumina powder, or a precursor powder to generate alumina by heat decomposition, (ii) zirconia powder, or a precursor powder to generate zirconia by heat decomposition, and, (iii) a solution or dispersion containing at least one transition metal element selected from the group consisting of Mn, Fe, Co, Ni, Cu, and Zn, (b) removing the solvent from said mixture, (c) drying the resultant mixture to produce a raw material powder, and, (d) shapng and sintering the aforementioned raw material powder. - View Dependent Claims (7)
- zirconia, wherein more than 65 percent of said zirconia is in the tetragonal phase, wanging from 1 mol percent to 40 mol percent and an oxide of at least one transition metal element selected from the group consisting of Mn, Fe, Co, Ni, Cu and Zn in an amount that said transition metal atom to Al and Zr ranges from 0.01 to 1 percent, which comprises the steps of
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