EP0257963A2
Expired / Lapsed
EP
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High strength zirconia ceramic
Assignee: NGK Insulators Ltd
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Filing: 1987-08-18
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Granted: —
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Expires: 2007-08-18
Abstract
Abstract A zirconia ceramic composition consisting essentially of Zr0 2 containing not more than 5.0 mol% Y 2 0 3 as a stabilizer and further containing aluminum and magnesium compounds in a combined amount of from 1 to 30 weight% expressed in terms of Al 2 O 3 and MgO relative to the amount of Zr0 2 . From 0.5 to 12 mol% Ce0 2 ; may also be present.
Inventors
- 👤 Kyosuke Tsunekawa
- 👤 Ken Fukuta
- 👤 Muneyuki Iwabuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/624; C04B35/01; C04B35/48; C04B35/486; C04B35/488; C04B35/4885
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
A zirconia ceramic composition consisting essentially of Zr0 2 containing not more than 5.0 mol% Y 2 O 3 as a stabilizer and further containing aluminum and magnesium compounds in a combined amount of from 1 to 30 weight% expressed in terms of Al 2 O 3 and MgO relative to the amount of Zr0 2 .
Claim 2
Dependent Claim
57 words
A zirconia ceramic composition consisting essentially of Zr0 2 containing not more than 5.0 mol% Y 2 O 3 as a stabilizer and further containing aluminum and magnesium compounds in a combined amount of from 1 to 30 weight% expressed in terms of Al 2 O 3 and MgO relative to the amount of Zr0 2 .
Claim 3
Dependent Claim
20 words
A zirconia ceramic composition according to claim 1, which comprises from 1.5 to 5 mol% Y 2 O 3 .
Claim 4
Dependent Claim
20 words
A zirconia ceramic composition according to claim 1 or 2, which comprises from 1 to 5 weight% aluminum and magnesium.
Claim 5
Dependent Claim
83 words
A zirconia ceramic composition consisting essentially of Zr0 2 containing, as a stabilizer, 0.5 to 5 mol% Y 2 O 3 and 0.5 to 12 mol% Ce0 2 , such that the total amount of Y 2 O 3 and Ce0 2 is from 1.0 to 15 mol%, and further containing aluminum and magnesium compounds in a combined amount of from 1 to 30 weight% expressed in terms of Al 2 O 3 and MgO relative to the amount of ZrO 2 .
Claim 6
Dependent Claim
83 words
A zirconia ceramic composition consisting essentially of Zr0 2 containing, as a stabilizer, 0.5 to 5 mol% Y 2 O 3 and 0.5 to 12 mol% Ce0 2 , such that the total amount of Y 2 O 3 and Ce0 2 is from 1.0 to 15 mol%, and further containing aluminum and magnesium compounds in a combined amount of from 1 to 30 weight% expressed in terms of Al 2 O 3 and MgO relative to the amount of ZrO 2 .
Claim 7
Dependent Claim
18 words
A zirconia ceramic composition according to claim 4, which comprises from 1 to 5 wt% aluminum and magnesium.
Claim 8
Dependent Claim
38 words
A zirconia ceramic composition according to any one of claims 1 to 5, wherein the aluminum :magnesium molar ratio, expressed in terms of Al 2 O 3 and MgO, is from 35 to 45 : 65 to 55.
Claim 9
Dependent Claim
38 words
A zirconia ceramic composition according to any one of claims 1 to 5, wherein the aluminum :magnesium molar ratio, expressed in terms of Al 2 O 3 and MgO, is from 60 to 75 : 40 to 25.
Claim 10
Dependent Claim
35 words
A zirconia ceramic composition according to any one of claims I to 5, wherein the aluminum:magnesium molar ratio, expressed in terms of Al 2 O 3 and MgO, is from 85 to 99 15to 1.
Claim 11
Dependent Claim
40 words
A zirconia ceramic composition according to any one of claims 1 to 8 wherein the aluminum compound is A1 2 0 3 , AI(OH)s, AICI 3 , Al(NO 3 )s or Al 2 (C 2 O 4 ) 3 .
Claim 12
Dependent Claim
39 words
A zirconia ceramic composition according to any one of claims 1 to 8 wherein the magnesium compound is MgO, Mg(OH) 2 , MgCl 2 , Mg(N0 3 ) 2 , MgC 2 0 4 : or MgCO 3 .
References Cited (Backward Citations)
No citation records indexed.
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