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US4171973A Expired / Lapsed US ⏱️ 0.0 years remaining

Diamond/sintered carbide cutting tool

Assignee: Sumitomo Electric Industries Ltd
•
Filing: 1978-05-04
•
Granted: 1979-10-23
•
Expires: 1998-05-04
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Abstract

Abstract A sintered compact for use in a cutting tool and a method of producing the same are disclosed. The compact comprises 95 to 20 volume % of diamond finer than one micron in size and the balance binder also finer than one micron selected from the group of WC, (MoW)C, WC base cemented carbide and (MoW)C base cemented carbide. The method comprises pulverizing a diamond powder by using cemented carbide balls and a pot having a cemented carbide lining, mixing the diamond powder with a powder abraded from the balls and pot to produce a powder mix finer than one micron containing 95 to 20 volume % of diamond, heat-treating the powder mix in vacuum so as to degas, and hot-pressing the powder mix under high pressure at high temperature within the stable range of diamond.

Inventors

  • 👤 Akio Hara
  • 👤 Shuji Yazu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-24 00:08
CPC Classifications
C; C22; C22C; C22C26/00; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B23; B23B; B23B27/00; B23B27/14; B23B27/148; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/063; B01J2203/0635; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 45 words
A sintered compact for use in a cutting tool comprising 95 to 20 volume % of diamond finer than one micron in size, and the balance binder of a carbide selected from the group of WC and (MoW)C, both finer than one micron in size.
Claim 2
Dependent Claim 45 words
A sintered compact for use in a cutting tool comprising 95 to 20 volume % of diamond finer than one micron in size, and the balance binder of a carbide selected from the group of WC and (MoW)C, both finer than one micron in size.
Claim 3
Dependent Claim 52 words
A sintered compact for use in a cutting tool comprising 95 to 20 volume % of diamond finer than one micron in size, and the balance binder of a cemented carbide selected from the group of WC base cemented carbide and (MoW)C base cemented carbide, both finer than one micron in size.
Claim 4
Dependent Claim 52 words
A sintered compact for use in a cutting tool comprising 95 to 20 volume % of diamond finer than one micron in size, and the balance binder of a cemented carbide selected from the group of WC base cemented carbide and (MoW)C base cemented carbide, both finer than one micron in size.
Claim 5
Dependent Claim 39 words
A sintered compact as claimed in claim 1, wherein the binder is added with one of carbide selected from the group of TaC, ZrC, HfC, TiC and NbC, the amount being less than 50 volume % of the binder.
Claim 6
Dependent Claim 17 words
A sintered compact as claimed in claim 1, wherein the diamond is 70 to 30 volume %.
Claim 7
Dependent Claim 37 words
A sintered compact as claimed in claim 2, wherein the binder is added with less than 50 volume % of a cemented carbide selected from the group of TiC, ZrC, HfC, TaC and NbC base cemented carbides.

References Cited (Backward Citations)

US1904049A Cited
US3136615A Cited
US3399254A Cited
US3372010A Cited
US3663475A Cited
US3785093A Cited
US3767371A Cited
US3944398A Cited
US4084942A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-10-22 1983-04-23 1983-10-23 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-10-22 1987-04-23 1987-10-23 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-10-22 1991-04-23 1991-10-23 $7700.00 Window Closed / Lapsed

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