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EP0181979A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

High hardness sintered compact and process for producing the same

Assignee: Sumitomo Electric Industries Ltd
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Filing: 1984-11-21
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Granted: —
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Expires: 2004-11-21
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Abstract

Abstract @ Herein is disclosed a high hardness sintered diamond compact and a process for the production of the same. The high hardness sintered diamond compact comprises 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (MoW)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron. The ratio by volume of the amount of the diamond particles having a diameter from 1 to 2 micron to that of the diamond particles having a diameter from 0.1 to 1 micron ranges from 4 to 1. The high hardness sintered diamond compact according to the present invention is preferably usable as a drawing die for drawing a high hardness plated-steel wire and as a tool bit. The process according to the invention, comprises the steps of: preparing a diamond powder having a particle diameter distribution from 0.2 to 2 micron; mixing the diamond powder with an iron group metal and one member selected from the group consisting of WC and (Mo,W)C powders each having a particle diameter not larger than 1 micron; hot-pressing the thus obtained mixture of powders at an ultra-high pressure and a high temperature where diamond may be stable.

Inventors

  • 👤 Tetsuo Nakai
  • 👤 Syuzi Yazu
  • 👤 Keizo Asai
  • 👤 Yoshiaki Kumazawa

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-09 00:11
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; C; C22; C22C; C22C26/00; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 86 words
A high hardness sintered diamond compact comprising 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (Mo,W)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron.
Claim 2
Dependent Claim 86 words
A high hardness sintered diamond compact comprising 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (Mo,W)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron.
Claim 3
Dependent Claim 50 words
A high hardness sintered diamond compact as claimed in Claim 1, wherein the ratio by volume of the amount of the diamond particles having a diameter from 1 to 2 micron to that of the diamond particles having a diameter from 0.1 to 1 micron ranges from 4 to 1.
Claim 4
Dependent Claim 83 words
A process for producing the high hardness sintered diamond compact as claimed in Claim 1, which comprises: preparing a diamond powder having a particle diameter distribution from 0.2 to 2 micron; mixing the diamond powder with an iron group metal and one member selected from the group consisting of WC and (Mo,W)C powders each having a particle diameter not larger than 1 micron; hot-pressing the thus obtained mixture of powders at an ultra-high pressure and a high temperature where diamond may be stable.
Claim 5
Dependent Claim 63 words
A process for producing a high hardness sintered diamond compact as claimed in Claim 3, wherein the mixed diamond powder has a ratio by volume of the amount of the diamond powder having a particle diameter from 1 micron to 2 micron to that of the diamond powder having a particle diameter from 0.1 micron to 1 micron ranging from 4 to 1.
Claim 6
Dependent Claim 78 words
A process for producing a high hardness sintered diamond compact as claimed in Claim 3, wherein the mixing step is conducted by grinding the diamond powder with the iron group metal and one member selected from the group consisting of WC and (Mo,W)C powders by using a pot and ball having a lining of a cermet of WC or (Mo,W)C bonded with an iron group metal, whereby WC or (Mo,W)C powder abraded from the lining being mixed thereto.
Claim 7
Dependent Claim 107 words
A process for producing the high hardness sintered diamond compact as claimed in Claim 1, which comprises: preparing a diamond powder having a particle diameter distribution from 0.2 to 2 micron; grinding the diamond powder with an iron group metal by means of a pot and ball having a lining of a cermet of WC or (Mo,W)C bonded with an iron group metal, thereby obtaining a mixture of the diamond powder, the iron group metal powder and a powder of WC or (Mo,W)C abraded from said lining; hot-pressing the thus obtained mixture of powders at an ultra-high pressure and a high temperature where diamond may be stable.

References Cited (Backward Citations)

GB1450271A Cited
GB2029389A Cited
FR2512430A1 Cited

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