US4566905A
Expired / Lapsed
US
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High density boron nitride-containing sintered body for cutting tool and a method of producing the same
Assignee: NOF Corp
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Filing: 1983-09-20
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Granted: 1986-01-28
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Expires: 2003-09-20
Abstract
Abstract A high density boron nitride-containing sintered body consisting of 60-95% by volume of high density boron nitride and 40-5% by volume of metal alone or in admixture with a ceramic, which high density boron nitride consists of 60-95% by volume of cubic system boron nitride and 40-5% by volume of wurtzite-structured boron nitride, and which cubic system boron nitride has an average particle size of at least 5 times that of the wurtzite-structured boron nitride. The sintered body has a high cutting performance and is suitable as a cutting tool for chilled roll, ultra-heat resisting alloy, cast iron and the like.
Inventors
- 👤 Tamotsu Akashi
- 👤 Masatada Araki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:17
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/583; C04B35/5831
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
A high density boron nitride-containing sintered body for use as a cutting tool, consisting essentially of 60-95% by volume of high density boron nitride and 40-5% by volume of metal alone or in admixture with a ceramic, said high density boron nitride consisting of 60-95% by volume of cubic boron nitride and 40-5% by volume of wurtzite-structured boron nitride, said cubic boron nitride having an average particle size of at least 5 times that of said wurtzite-structured boron nitride.
Claim 2
Dependent Claim
79 words
A high density boron nitride-containing sintered body for use as a cutting tool, consisting essentially of 60-95% by volume of high density boron nitride and 40-5% by volume of metal alone or in admixture with a ceramic, said high density boron nitride consisting of 60-95% by volume of cubic boron nitride and 40-5% by volume of wurtzite-structured boron nitride, said cubic boron nitride having an average particle size of at least 5 times that of said wurtzite-structured boron nitride.
Claim 3
Independent Claim
99 words
A method of producing high density boron nitride-containing sintered bodies for use as a cutting tool, comprising mixing together homogeneously 60-95% by volume of high density boron nitride, which consists of 60-95% by volume of cubic boron nitride and 40-5% by volume of wurtzite-structured boron nitride, with 40-5% by volume of metal alone or in admixture with a ceramic, and sintering the resulting mixture at temperature of not lower than 1,000° C. under a pressure of 20-70 Kb, wherein the cubic boron nitride has an average particle size of at least 5 times that of the wurtzite-structured boron nitride.
Claim 4
Independent Claim
99 words
A method of producing high density boron nitride-containing sintered bodies for use as a cutting tool, comprising mixing together homogeneously 60-95% by volume of high density boron nitride, which consists of 60-95% by volume of cubic boron nitride and 40-5% by volume of wurtzite-structured boron nitride, with 40-5% by volume of metal alone or in admixture with a ceramic, and sintering the resulting mixture at temperature of not lower than 1,000° C. under a pressure of 20-70 Kb, wherein the cubic boron nitride has an average particle size of at least 5 times that of the wurtzite-structured boron nitride.
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) | 1989-01-27 | 1989-07-29 | 1990-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-27 | 1993-07-29 | 1994-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-27 | 1997-07-29 | 1998-01-28 | $7700.00 | Window Closed / Lapsed |