Patent US3871891A successfully refreshed from Google Patents.
US3871891A
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US
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Method for the production of highly wear-resistant ceramic material
Assignee: Ceramtec GmbH
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Filing: 1973-12-14
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Granted: 1975-03-18
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Expires: 1993-12-14
Abstract
Abstract A new method for the production of extremely wear-resistant aluminum oxide ceramic material, particularly Al2O3 in which at least 98% Al2O3 powder is mixed with 10-50 pph carbonaceous plasticizer, optionally pressed into a blank, heated to 1,280*1,500* C., sintered for at least 5 minutes at the highest temperature, and then cooled is described.
Inventors
- 👤 Karl-Heinz Schuller
- 👤 Horst Nink
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:49
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/622; C04B35/64; C04B35/645
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
METHOD FOR THE PRODUCTION OF HIGHLY WEAR-RESISTANT BODIES OF AL2O3 CERAMIC MATERIAL, CHARACTERIZED BY THE SUCCESSION OF THE FOLLOWING OPERATING STEPS: A. PREPARING A MIXTURE CONSISTING OF 100 PARTS BY WEIGHT OF
Claim 2
Dependent Claim
32 words
METHOD FOR THE PRODUCTION OF HIGHLY WEAR-RESISTANT BODIES OF AL2O3 CERAMIC MATERIAL, CHARACTERIZED BY THE SUCCESSION OF THE FOLLOWING OPERATING STEPS: A. PREPARING A MIXTURE CONSISTING OF 100 PARTS BY WEIGHT OF
Claim 3
Dependent Claim
12 words
Method according to claim 1 wherein polyvinyl alcohol is the carbonaceous plasticizer.
Claim 4
Dependent Claim
11 words
Method according to claim 1 wherein 100% Al203 powder is used.
Claim 5
Dependent Claim
16 words
Method according to claim 1 wherein the mixture of step (a) is pressed into a blank.
Claim 6
Dependent Claim
17 words
Method according to claim 4 wherein the pressure is applied before the maximum temperature has been attained.
Claim 7
Dependent Claim
18 words
Method according to claim 4 wherein the pressure is applied when about the maximum temperature has been attained.
Claim 8
Dependent Claim
10 words
Dense, ceramic aluminum oxide body, produced according to claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |