Patent US4801510A successfully refreshed from Google Patents.
US4801510A
Expired / Lapsed
US
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Alumina coated silcon carbide whisker-alumina composition
Assignee: Kennametal Inc
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Filing: 1987-09-02
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Granted: 1989-01-31
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Expires: 2007-09-02
Abstract
Abstract An article of manufacture is provided having a SiC whisker reinforced alumina matrix substrate which has an alumina coating bonded to its exterior surface. It has been found that these articles are useful as cutting inserts in the high speed rough machining of steels.
Inventors
- 👤 Pankaj K. Mehrotra
- 👤 Elizabeth R. Billman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/71; C04B35/78; C04B35/80; C04B41/00; C04B41/009; B; B23; B23B; B23B27/00; B23B27/14; B23B27/148; C04B35/01; C04B35/10; C04B35/111; C04B41/45; C04B41/50; C04B41/5025; C04B41/5031; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/87; C04B41/89; B23B2228/00; B23B2228/61
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
39 words
A coated composite comprising: a substrate comprising at least 5, and less than 30, volume percent silicon carbide whiskers; and less than about 95, and more than 70, volume percent alumina; and an alumina coating bonded to said substrate.
Claim 2
Dependent Claim
39 words
A coated composite comprising: a substrate comprising at least 5, and less than 30, volume percent silicon carbide whiskers; and less than about 95, and more than 70, volume percent alumina; and an alumina coating bonded to said substrate.
Claim 3
Dependent Claim
25 words
The coated composite according to claim 1 wherein said SiC whiskers comprise at least 5 to less than about 20 volume percent of said substrate.
Claim 4
Dependent Claim
21 words
The coated composite according to claim 2 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 5
Dependent Claim
21 words
The coated composite according to claim 2 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 6
Dependent Claim
15 words
The coated composite according to claim 2 wherein said substrate further comprises a sintering aid.
Claim 7
Dependent Claim
31 words
The coated composite according to claim 2 wherein said substrate further comprises zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate.
Claim 8
Dependent Claim
22 words
The coated composite according to claim 1 wherein said SiC whiskers comprise 20 to less than 30 volume percent of said substrate.
Claim 9
Dependent Claim
21 words
The coated composite according to claim 7 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 10
Dependent Claim
21 words
The coated composite according to claim 7 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 11
Dependent Claim
15 words
The coated composite according to claim 7 wherein said substrate further comprises a sintering aid.
Claim 12
Dependent Claim
31 words
The coated composite according to claim 7 wherein said substrate further comprises zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate.
Claim 13
Dependent Claim
21 words
The coated composite according to claim 1 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 14
Dependent Claim
21 words
The coated composite according to claim 1 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 15
Dependent Claim
64 words
A cutting insert comprising: a cutting edge formed at a juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate, said substrate composed of more than 5, and less than 30, volume percent silicon carbide whiskers, and less than 95, and more than 70, volume percent alumina.
Claim 16
Dependent Claim
64 words
A cutting insert comprising: a cutting edge formed at a juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate, said substrate composed of more than 5, and less than 30, volume percent silicon carbide whiskers, and less than 95, and more than 70, volume percent alumina.
Claim 17
Dependent Claim
25 words
The cutting insert according to claim 14 wherein said SiC whiskers comprise at least 5 to less than about 20 volume percent of said substrate.
Claim 18
Dependent Claim
21 words
The cutting insert according to claim 15 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 19
Dependent Claim
21 words
The cutting insert according to claim 15 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 20
Dependent Claim
17 words
The cutting insert according to claim 15 wherein said substrate is further composed of a sintering aid.
Claim 21
Dependent Claim
33 words
The cutting insert according to claim 15 wherein said substrate is further composed of zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate.
Claim 22
Dependent Claim
22 words
The cutting insert according to claim 14 wherein said SiC whiskers comprise 20 to less than 30 volume percent of said substrate.
Claim 23
Dependent Claim
21 words
The cutting insert according to claim 20 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 24
Dependent Claim
21 words
The cutting insert according to claim 20 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 25
Dependent Claim
17 words
The cutting insert according to claim 20 wherein said substrate is further composed of a sintering aid.
Claim 26
Dependent Claim
33 words
The cutting insert according to claim 20 wherein said substrate is further composed of zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate.
Claim 27
Dependent Claim
21 words
The cutting insert according to claim 14 wherein said alumina coating has a thickness between about 1.5 to about 10 microns.
Claim 28
Dependent Claim
21 words
The cutting insert according to claim 14 wherein said alumina coating has a thickness between about 3 to about 7 microns.
Claim 29
Dependent Claim
22 words
The cutting insert according to claim 14 wherein said SiC whiskers comprise between about 22 and 28 volume percent of said substrate.
Claim 30
Dependent Claim
22 words
The cutting insert according to claim 14 wherein said SiC whiskers comprise between about 10 and 18 volume percent of said substrate.
Claim 31
Dependent Claim
17 words
The cutting insert according to claim 14 further comprising a TiN coating bonded over said alumina coating.
Claim 32
Dependent Claim
58 words
A cutting insert comprising: a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate; and said substrate containing more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina based matrix.
Claim 33
Dependent Claim
58 words
A cutting insert comprising: a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate; and said substrate containing more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina based matrix.
Claim 34
Dependent Claim
15 words
The cutting insert according to claim 30 wherein said substrate further contains a sintering aid.
Claim 35
Dependent Claim
31 words
The cutting insert according to claim 30 wherein said substrate further contains zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate.
Claim 36
Dependent Claim
24 words
The cutting insert according to claim 32 wherein said substrate contains more than 5, and less than about 20, volume percent silicon carbide whiskers.
Claim 37
Dependent Claim
24 words
The cutting insert according to claim 30 wherein said substrate contains more than 5, and less than about 20, volume percent silicon carbide whiskers.
Claim 38
Dependent Claim
59 words
A cutting insert comprising: a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate; and said substrate composition consisting of more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina matrix.
Claim 39
Dependent Claim
59 words
A cutting insert comprising: a cutting edge formed at the juncture of a rake surface and a flank surface of said cutting insert; said cutting insert having a substrate and an alumina coating bonded to said substrate; and said substrate composition consisting of more than 5, and less than 30, volume percent SiC whiskers distributed in an alumina matrix.
Claim 40
Dependent Claim
29 words
The cutting insert according to claim 35 wherein said substrate composition consists of more than 5, and less than 20, volume percent SiC whiskers distributed in said alumina matrix.
Claim 41
Dependent Claim
17 words
The cutting insert according to claim 36 wherein said substrate composition further consists of a sintering aid.
Claim 42
Dependent Claim
35 words
The cutting insert according to claim 36 wherein said substrate composition further consists of a zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate composition.
Claim 43
Dependent Claim
17 words
The cutting insert according to claim 35 wherein said substrate composition further consists of a sintering aid.
Claim 44
Dependent Claim
35 words
The cutting insert according to claim 35 wherein said substrate composition further consists of a zirconia in an amount greater than about 2 volume percent, but not exceeding 20 volume percent of said substrate composition.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |