Patent US4789277A successfully refreshed from Google Patents.
US4789277A
Expired / Lapsed
US
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Method of cutting using silicon carbide whisker reinforced ceramic cutting tools
Assignee: Advanced Composite Materials Corp
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Filing: 1988-02-23
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Granted: 1988-12-06
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Expires: 2008-02-23
Abstract
Abstract Cutting tools are disclosed which are comprised of composite bodies comprising a ceramic matrix reinforced by ceramic whiskers. The ceramic matrix may be alumina or silicon nitride, and may contain toughening components. The whiskers are preferably silicon carbide, but may be other known ceramic whiskers. Whisker content in the composite is 2-40%, with higher contents generally used for tools when the expected service involves interrupted cutting and lower contents generally used for continuous cutting tools.
Inventors
- 👤 James F. Rhodes
- 👤 Chester J. Dziedzic
- 👤 Ronald L. Beatty
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:39
CPC Classifications
B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; C04B35/515; C04B35/58; C04B35/584; C04B35/597; C04B35/622; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80; B23B2228/00; B23B2228/61; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/3224; C04B2235/3225; C04B2235/38; C04B2235/3852; C04B2235/3865; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5244; C04B2235/5276; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/96; Y; Y10; Y10T; Y10T407/00; Y10T407/27; Y10T408/00; Y10T408/03; Y10T408/78; Y10T409/00; Y10T409/30; Y10T409/303752; Y10T409/40; Y10T409/400175; Y10T409/50; Y10T409/50082; Y10T82/00; Y10T82/10; Y10T83/00; Y10T83/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
67 words
In a method of cutting metal wherein a cutting tool is brought into contact with a metal workpiece and the cutting tool and metal workpiece move relative to each other whereby metal is removed by the cutting tool from the metal workpiece, the improvement comprising using a sintered composite cutting tool having a matrix consisting essentially of alumina and 2-40 volume percent silicon carbide whiskers distributed therethrough.
Claim 2
Dependent Claim
67 words
In a method of cutting metal wherein a cutting tool is brought into contact with a metal workpiece and the cutting tool and metal workpiece move relative to each other whereby metal is removed by the cutting tool from the metal workpiece, the improvement comprising using a sintered composite cutting tool having a matrix consisting essentially of alumina and 2-40 volume percent silicon carbide whiskers distributed therethrough.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which the metal is removed substantially continuously.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said metal cutting is selected from shaping, planing, milling, facing, broaching, grinding, sawing, turning, boring, drilling and reaming.
Claim 5
Dependent Claim
20 words
The method of claim 1 wherein said composite consists essentially of 65-80 volume percent alumina and 20-35 volume percent whiskers.
Claim 6
Dependent Claim
20 words
The method of claim 1 wherein said composite consists essentially of 88-98 volume percent alumina and 2-12 volume percent whiskers.
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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) | 1991-12-06 | 1992-06-06 | 1992-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-06 | 1996-06-06 | 1996-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-06 | 2000-06-06 | 2000-12-06 | $7700.00 | Window Closed / Lapsed |