US4249914A
Expired / Lapsed
US
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Cutting tool material and method for producing cutting tool material
Assignee: Nippon Tungsten Co Ltd
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Filing: 1978-04-18
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Granted: 1981-02-10
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Expires: 1998-04-18
Abstract
Abstract The powder mixture consisting of 0.5 to 5 percent by weight of TiN and 99.5 to 95 percent by weight of Al2O3 is first presintered and is subsequently subjected to a hot isostatic pressing so as to produce a sintered product which has the maximum grain size of 2 mu m and the hardness of more than HRA 94. Such sintered product is used as a cutting tool for a high-speed continuous cutting operation.
Inventors
- 👤 Kazuki Ogawa
- 👤 Mitsuhiko Furukawa
- 👤 Yoshimichi Hara
- 👤 Takashi Kitahira
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/6455; C04B35/01; C04B35/10; C04B35/111
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A method for producing a cutting tool material comprising: (i) preparing a powder mixture of raw material powder consisting of 0.5 to 5 percent by weight of TiN and 99.5 to 95 percent by weight of Al 2 O 3 , said TiN and Al 2 O 3 both having a grain size of less than 1 μm, (ii) forming said powder mixture into a green compact by compressing said powder mixture, (iii) presintering said green compacts in a vacuum at a maximum temperature of 1500° C. until a presintered body having a relative density of more than 95 percent is obtained, and (iv) subjecting the presintered body to hot isosatic pressing for 30 to 60 minutes at 1400°-1450° C. under a gas pressure of 1300 to 2000 kg/cm 2 .
Claim 2
Independent Claim
131 words
A method for producing a cutting tool material comprising: (i) preparing a powder mixture of raw material powder consisting of 0.5 to 5 percent by weight of TiN and 99.5 to 95 percent by weight of Al 2 O 3 , said TiN and Al 2 O 3 both having a grain size of less than 1 μm, (ii) forming said powder mixture into a green compact by compressing said powder mixture, (iii) presintering said green compacts in a vacuum at a maximum temperature of 1500° C. until a presintered body having a relative density of more than 95 percent is obtained, and (iv) subjecting the presintered body to hot isosatic pressing for 30 to 60 minutes at 1400°-1450° C. under a gas pressure of 1300 to 2000 kg/cm 2 .
Claim 3
Dependent Claim
54 words
Cutting tool material consisting of 0.5 to 5 percent by weight of Tin and 99.5 to 95 percent by weight of Al 2 O 3 , and having a maximum grain size of less than 2 μm and a hardness of more than H R A 94 prepared by the process of claim 1.
Claim 4
Independent Claim
137 words
A method for producing a cutting tool material comprising: (i) preparing a powder mixture of raw material powder consisting of 0.5 to 5 percent by weight of TiN, more than 0 but less than 1 percent by weight MgO, and the balance Al 2 O 3 , said TiN and Al 2 O 3 both having a grain size of less than 1 μm, (ii) forming said powder mixture into a green compact by compressing said powder mixture, (iii) presintering said green compacts in a vacuum at a maximum temperature of 1500° C. until a presintered body having a relative density of more than 95 percent is obtained, and (iv) subjecting the presintered body to hot isostatic pressing for 30 to 60 minutes at 1400°-1450° C. under a gas pressure of 1300 to 2000 kg/cm 2 .
Claim 5
Independent Claim
137 words
A method for producing a cutting tool material comprising: (i) preparing a powder mixture of raw material powder consisting of 0.5 to 5 percent by weight of TiN, more than 0 but less than 1 percent by weight MgO, and the balance Al 2 O 3 , said TiN and Al 2 O 3 both having a grain size of less than 1 μm, (ii) forming said powder mixture into a green compact by compressing said powder mixture, (iii) presintering said green compacts in a vacuum at a maximum temperature of 1500° C. until a presintered body having a relative density of more than 95 percent is obtained, and (iv) subjecting the presintered body to hot isostatic pressing for 30 to 60 minutes at 1400°-1450° C. under a gas pressure of 1300 to 2000 kg/cm 2 .
Claim 6
Dependent Claim
61 words
Cutting tool material consisting of 0.5 to 5 percent by weight of TiN, more than 0 but less than 1 percent by weight of MgO, and the balance Al 2 O 3 , and having a maximum grain size of less than 2 μM and a hardness of more than H R A 94 prepared by the process of claim 3.
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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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |