Patent US5418197A successfully refreshed from Google Patents.
US5418197A
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US
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SiC whisker and particle reinforced ceramic cutting tool material
Assignee: Sandvik AB
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Filing: 1994-01-12
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Granted: 1995-05-23
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Expires: 2014-01-12
Abstract
Abstract There is now provided a ceramic cutting tool material comprising a ceramic, preferably aluminum oxide based, matrix with 5-50%, preferably 10-40%, by volume of homogeneously dispersed SiC-whiskers and 1-20%, preferably 3-8%, by volume of particulate additions with a size <500 nm, preferably <200 nm, based upon carbides and/or nitrides and/or borides of metals from group VB (V,Nb,Ta) in the periodic system or solid solutions thereof. The nanosize particulate additions are predominantly present inside the matrix grains and not in the grain boundaries.
Inventors
- 👤 Gunnar Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:27
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
65 words
A ceramic cutting tool material comprising a ceramic matrix with 5-50% by volume of homogeneously dispersed SiC-whiskers and 1-20% by volume of particulate additions with a size<500 nm based upon carbides and/or nitrides and/or borides of metals from group VB (V,Nb,Ta) of the periodic system or solid solutions thereof, said particulate additions being predominantly located inside the matrix grains and not in the grain boundaries.
Claim 2
Dependent Claim
65 words
A ceramic cutting tool material comprising a ceramic matrix with 5-50% by volume of homogeneously dispersed SiC-whiskers and 1-20% by volume of particulate additions with a size<500 nm based upon carbides and/or nitrides and/or borides of metals from group VB (V,Nb,Ta) of the periodic system or solid solutions thereof, said particulate additions being predominantly located inside the matrix grains and not in the grain boundaries.
Claim 3
Dependent Claim
15 words
The ceramic cutting tool material of claim 1 wherein the ceramic matrix comprises aluminum oxide.
Claim 4
Dependent Claim
18 words
The ceramic cutting tool material of claim 1 wherein the ceramic matrix comprises Si 3 N 4 .
Claim 5
Dependent Claim
18 words
The ceramic cutting tool material of claim 1 wherein the material contains 10-40% by volume of said whiskers.
Claim 6
Dependent Claim
19 words
The ceramic cutting tool material of claim 1 wherein the material contains 3-8% by volume of said particulate additions.
Claim 7
Dependent Claim
19 words
The ceramic cutting tool material of claim 1 wherein the material contains said particulate additions with a size<200 nm.
Claim 8
Dependent Claim
23 words
The ceramic cutting tool material of claim 1 wherein the particulate additions have a lower coefficient of thermal expansion than the ceramic matrix.
Claim 9
Dependent Claim
28 words
The ceramic cutting tool material of claim 1 wherein the particulate additions are selected from the group consisting of TaC, TaN, NbC, VC and solid solution mixtures thereof.
Claim 10
Dependent Claim
22 words
The ceramic cutting tool material of claim 1 wherein at least 55% of the particulate additions are present inside the matrix grains.
Claim 11
Dependent Claim
22 words
The ceramic cutting tool material of claim 1 wherein at least 75% of the particulate additions are present inside the matrix grains.
Claim 12
Dependent Claim
28 words
The ceramic cutting tool material of claim 1 wherein the SiC-whiskers have a diameter of 0.5-10 μm, a length of 2.5-100 μm and a length/diameter ratio of 5-10.
Claim 13
Dependent Claim
17 words
The ceramic cutting tool material of claim 1 further comprising monocrystal SiC platelets partly replacing the SiC-whiskers.
Claim 14
Dependent Claim
31 words
The ceramic cutting tool material of claim 1 further comprising monocrystal SiC platelets partly replacing the SiC-whiskers, the platelets having a diameter of 5-20 μm and a thickness of 0.5-4 μm.
Claim 15
Dependent Claim
18 words
The ceramic cutting tool material of claim 1 wherein the ceramic matrix has a grain size of<10 μm.
Claim 16
Dependent Claim
18 words
The ceramic cutting tool material of claim 1 wherein the ceramic matrix has a grain size of<4 μm.
Claim 17
Dependent Claim
19 words
The ceramic cutting tool material of claim 1 further comprising up to 20 wt. % of zirconium oxide particles.
Claim 18
Dependent Claim
17 words
The ceramic cutting tool material of claim 1 wherein the ceramic matrix is a ceramic oxide matrix.
References Cited (Backward Citations)
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JPH01308881A
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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) | 1998-05-22 | 1998-11-21 | 1999-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-22 | 2002-11-21 | 2003-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-22 | 2006-11-21 | 2007-05-23 | $7700.00 | Window Closed / Lapsed |