EP0096519A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for producing zirconium oxide sintered body
Assignee: Resonac Corp
•
Filing: 1983-05-27
•
Granted: —
•
Expires: 2003-05-27
Abstract
Abstract A zirconium oxide sintered body for an oxygen concentration sensor is produced by mixing 87.5 to 91.0% by weight of zirconium oxide powder, 8.5 to 12.3% by weight of yttrium oxide powder, 0.5% by weight or less of silicon oxide and 0.2 to 1.0% by weight of aluminium oxide, drying the resulting mixture, followed by sintering so as to make the cubic phase content in crystal phase of the resulting sintered body at ordinary temperatures 95% by weight or more. Such zirconium oxide sintered bodies have excellent mechanical strength, ionic conductivity and thermal shock properties and can be used stably for a long period of time.
Inventors
- 👤 Takao Nakada
- 👤 Mamoru Kamimura
- 👤 Toranosuke Ashizawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 11:29
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/406; G01N27/407; G01N27/4073; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; H; H01; H01M; H01M8/00; H01M8/10; H01M8/12; H01M8/124; H01M8/1246; H01M8/1253; Y; Y02; Y02E; Y02E60/00; Y02E60/30; Y02E60/50; Y02P; Y02P70/00; Y02P70/50
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
72 words
A process for producing a zirconium oxide sintered body whose crystal phase at ordinary temperatures contains 95% by weight or more of a cubic phase, which comprises mixing 87.5 to 91.0% by weight of zirconium oxide powder, 8.5 to 12.3% by weight of yttrium oxide powder, 0.5% by weight or less of silicon oxide and 0.2 to 1.0% by weight of aluminium oxide, drying the resulting mixture, and then sintering the mixture.
Claim 2
Dependent Claim
72 words
A process for producing a zirconium oxide sintered body whose crystal phase at ordinary temperatures contains 95% by weight or more of a cubic phase, which comprises mixing 87.5 to 91.0% by weight of zirconium oxide powder, 8.5 to 12.3% by weight of yttrium oxide powder, 0.5% by weight or less of silicon oxide and 0.2 to 1.0% by weight of aluminium oxide, drying the resulting mixture, and then sintering the mixture.
Claim 3
Dependent Claim
18 words
A process according to claim 1, wherein the mixture is heat-treated at 1,300°C or higher after the drying.
Claim 4
Dependent Claim
22 words
A process according to claim 2, wherein the blending drying step and the heat treatment step are repeated two or more times.
Claim 5
Dependent Claim
20 words
A process according to claim 2 or 3 wherein the heat treatment is carried out at 1300°-1500°C for 10-120 minutes.
Claim 6
Dependent Claim
24 words
A process according to any of the preceding claims wherein the sintering is conducted in air or a neutral atmosphere at 1,500° to 1,700°C.
Claim 7
Dependent Claim
29 words
A process according to any one of the preceding claims, wherein the average particle size of the mixture of the oxide powders after grinding is 1 µm or less.
Claim 8
Dependent Claim
24 words
A process according to claim 6 wherein at least 40% by weight of the oxide particles have a particle size of 0.5µm or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.