US4769346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whisker composite ceramics for metal extrusion or the like
Assignee: Corning Glass Works
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Filing: 1986-10-24
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Granted: 1988-09-06
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Expires: 2006-10-24
Abstract
Abstract A composite ceramic extrusion die consisting of a silicon carbide wisker-reinforced cordierite ceramic wherein the predominant matrix phase is cordierite or, preferably, barium-stuffed cordierite having a crystal compositon xBaO.4MgO.(4+x)Al 2 O 3 .(10-2x)SiO 2 wherein x ranges from zero up to about 0.5, such extrusion die exhibiting excellent durability under the conditions of non-ferrous metal alloy extrusion at temperatures of 700°-900° C., is described.
Inventors
- 👤 Kishor P. Gadkaree
- 👤 K. Pattabhirami Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:35
CPC Classifications
B; B21; B21C; B21C25/00; B21C25/02; B21C25/025; C; C03; C03C; C03C14/00; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/195; C04B35/622; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80; C03C2214/00; C03C2214/06; C03C2214/20; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3201; C04B2235/3205; C04B2235/3206; C04B2235/3215; C04B2235/36; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5244; C04B2235/5276; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/65; C04B2235/66; C04B2235/661; C04B2235/662; C04B2235/70; C04B2235/96; C04B2235/9607; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
79 words
In a metal extrusion die for the extrusion of ferrous and non-ferrous alloys comprising a ceramic body incorporating an extrusion orifice therethrough for the extrusion of said alloys, the improvement wherein the die consists of a whisker-reinforced crystalline body consisting essentially of about 5-35 weight percent of SiC whiskers and 65-95 weight percent of a crystalline matrix, the predominant crystal phase in the crystalline matrix consisting of a crystal selected from the group consisting of cordierite and barium-stuffed cordierite.
Claim 2
Dependent Claim
79 words
In a metal extrusion die for the extrusion of ferrous and non-ferrous alloys comprising a ceramic body incorporating an extrusion orifice therethrough for the extrusion of said alloys, the improvement wherein the die consists of a whisker-reinforced crystalline body consisting essentially of about 5-35 weight percent of SiC whiskers and 65-95 weight percent of a crystalline matrix, the predominant crystal phase in the crystalline matrix consisting of a crystal selected from the group consisting of cordierite and barium-stuffed cordierite.
Claim 3
Dependent Claim
34 words
A die in accordance with claim 1 wherein the crystalline matrix has an oxide composition, in weight percent, of about 0-12% BaO, 12-14% MgO, 34-40% Al 2 O 3 and 36-52% SiO 2 .
Claim 4
Dependent Claim
60 words
A die in accordance with claim 2 wherein the whisker-reinforced crystalline body consists essentially of 20-30% by weight of SiC whiskers and 70-80% by weight of a crystalline matrix, and wherein the predominant crystal phase present in the matrix has an approximate crystal composition: xBaO.4MgO.(4+x)Al 2 O 3 .(10-2x)SiO 2 , wherein x ranges from zero up to about 0.5.
Claim 5
Dependent Claim
36 words
A die in accordance with claim 3 wherein the crystal phase present in the matrix consists essentially of barium-stuffed cordierite crystals of the formula: xBaO.4MgO.(4+x)Al 2 O 3 .(10-2x)SiO 2 wherein x ranges from about 0.4-0.5.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |