Patent CH119028A successfully refreshed from Google Patents.
Patent US5688729A successfully refreshed from Google Patents.
US5688729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whisker-reinforced ceramic material
Assignee: Sandvik Intellectual Property AB
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Filing: 1996-06-13
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Granted: 1997-11-18
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Expires: 2016-06-13
Abstract
Abstract There is now provided a ceramic material comprising of alumina, 10-50% by volume, preferably 20-35% by volume, silicon carbide whiskers, 1-25% by volume, preferably 5-20% by volume, most preferably 7-15% by volume, zirconia and 1-20% by volume, preferably 3-15% by volume, titanium compound-containing cubic phase. If this cubic phase has a lattice spacing of 4.29 to 4.40 ANGSTROM and a zirconium content of 3-65 weight %, a material with improved performance when turning heat resistant material such as aged Iconel 718, is obtained.
Inventors
- 👤 Mats Andersson
- 👤 Marianne Collin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:45
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C04B35/622; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
A method of manufacturing a ceramic material comprising alumina, 10-50% by volume of silicon carbide whiskers, 1-25% by volume of zirconia and 1-20% by volume of a titanium compound-containing cubic phase comprising mixing and granulating powders of silicon carbide whiskers, alumina and zirconia and a titanium compound capable of forming a cubic phase and hot pressing the mixture at a hot press temperature of 1500°-1750° C. a mechanical pressure of 5-40 MPa having a heating up period before the hot pressing temperature is reached and the mechanical pressure is applied, being performed under a subpressure of 50 to 800 mbar.
Claim 2
Independent Claim
100 words
A method of manufacturing a ceramic material comprising alumina, 10-50% by volume of silicon carbide whiskers, 1-25% by volume of zirconia and 1-20% by volume of a titanium compound-containing cubic phase comprising mixing and granulating powders of silicon carbide whiskers, alumina and zirconia and a titanium compound capable of forming a cubic phase and hot pressing the mixture at a hot press temperature of 1500°-1750° C. a mechanical pressure of 5-40 MPa having a heating up period before the hot pressing temperature is reached and the mechanical pressure is applied, being performed under a subpressure of 50 to 800 mbar.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the mixture is hot pressed at a temperature of 1550°-1650° C.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the mixture is hot pressed at a pressure of 20 to 40 MPa.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the titanium compound is titanium nitride.
Claim 6
Dependent Claim
13 words
The method of claim 1 wherein the titanium compound is titanium zirconium carbonitride.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the heating up period is performed under a subpressure of 100 to 500 mbar.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein said granulating is performed by freeze granulation followed by freeze drying.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-11-17 | 2001-05-19 | 2001-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-11-17 | 2005-05-19 | 2005-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-11-17 | 2009-05-19 | 2009-11-18 | $7700.00 | Window Closed / Lapsed |