US5397750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabricating an aluminum article
Assignee: Corning Inc
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Filing: 1994-04-29
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Granted: 1995-03-14
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Expires: 2014-04-29
Abstract
Abstract An aluminum article having a mirror-like surface and an improved working tool and method for fabricating the article from an aluminum blank, the tool comprising a mechanically strong, abrasion-resistant body against which the aluminum blank is forced under pressure, the tool body comprising a whisker-reinforced, crystalline body consisting essentially of about 5-35 weight % of SiC whiskers and 65-95 weight % of a crystalline matrix. The predominant crystal phase in the crystalline matrix may be a CaO--Al 2 O 3 --SiO 2 crystal phase.
Inventors
- 👤 Kishor P. Gadkaree
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:37
CPC Classifications
B; B21; B21D; B21D37/00; B21D37/01; B21C; B21C3/00; B21C3/02; C; C03; C03C; C03C14/00; C03C2214/00; C03C2214/06; C03C2214/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
91 words
In an improved working tool for fabricating an article from an aluminum blank, the tool comprising a mechanically strong, abrasion-resistant body having a surface against which the aluminum blank is forced under pressure, and the improvement being a tool comprising a whisker-reinforced, crystalline body consisting essentially of about 5.35 weight % of SiC whiskers and 65-95 weight % of a crystalline matrix comprising a predominant crystal phase of CaO--Al 2 O 3 --SiO 2 and is essentially non-reactive with the aluminum whereby the fabricated aluminum article has an improved surface finish.
Claim 2
Dependent Claim
91 words
In an improved working tool for fabricating an article from an aluminum blank, the tool comprising a mechanically strong, abrasion-resistant body having a surface against which the aluminum blank is forced under pressure, and the improvement being a tool comprising a whisker-reinforced, crystalline body consisting essentially of about 5.35 weight % of SiC whiskers and 65-95 weight % of a crystalline matrix comprising a predominant crystal phase of CaO--Al 2 O 3 --SiO 2 and is essentially non-reactive with the aluminum whereby the fabricated aluminum article has an improved surface finish.
Claim 3
Dependent Claim
20 words
An improved working tool in accordance with claim 1 wherein the predominant crystal phase in the crystalline matrix is anorthite.
Claim 4
Dependent Claim
16 words
An improved working tool in accordance with claim 1 wherein the tool is an extrusion die.
Claim 5
Dependent Claim
56 words
An improved working tool in accordance with claim 1 wherein the matrix of the whisker-reinforced, crystalline body has an oxide composition consisting essentially of, as calculated in weight % on an oxide basis, 16-20% CaO, 38.5-46% Al 2 O 3 , 35-42% SiO 2 and an effective amount of a nucleation agent not exceeding about 10%.
Claim 6
Dependent Claim
17 words
An improved working tool in accordance with claim 4 wherein the nucleating agent is ZrO 2 .
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) | 1998-03-13 | 1998-09-12 | 1999-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-03-13 | 2002-09-12 | 2003-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-03-13 | 2006-09-12 | 2007-03-14 | $7700.00 | Window Closed / Lapsed |