US5688729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whisker-reinforced ceramic material
Assignee: Sandvik Intellectual Property AB
•
Filing: 1996-06-13
•
Granted: 1997-11-18
•
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 19:20
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.
References Cited (Backward Citations)
US4745091A
Cited
US4543345A
Cited
US4961757A
Cited
US4746635A
Cited
US4746635B1
Cited
US4789277B1
Cited
US4789277A
Cited
US4867761A
Cited
US4804645A
Cited
US4849381A
Cited
US5110770A
Cited
US5123935A
Cited
JPH04149062A
Cited
US5238334A
Cited
US5418197A
Cited
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 |