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Diamond polycrystal and tool provided with same

A polycrystalline and diamond technology, which is applied in diamond, tool manufacturing, crystal growth, etc., can solve the problems of low hardness, low strength, and insufficient mechanical properties of diamond polycrystalline materials, etc.

Active Publication Date: 2020-03-27
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these diamond polycrystals have low hardness and low strength, resulting in insufficient mechanical properties as tool materials

Method used

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  • Diamond polycrystal and tool provided with same
  • Diamond polycrystal and tool provided with same

Examples

Experimental program
Comparison scheme
Effect test

manufacture example 1 to 12

[0109] (manufacture of diamond polycrystal)

[0110] First, raw materials for diamond polycrystals are prepared. In Production Examples 1 to 5 and Production Examples 9 to 12, non-diamond carbon materials having degrees of graphitization shown in Table 1 were prepared. In each of Production Examples 6 and 7, conventional isotropic graphite prepared by calcining graphite powder was prepared. In Production Example 8, a powder prepared by pulverizing graphite having a low degree of graphitization and containing impurities (hydrogen and oxygen) of about 0.1% by mass to an average particle diameter of 8 nm using a planetary ball mill was prepared.

[0111] Then, in each of Production Examples 1 to 11, the prepared raw materials were vacuum-heated and sealed in a metal bag made of Ta. Use a high-pressure high-temperature generating device to increase the pressure to 8GPa, then heat the temperature to 300°C, and then simultaneously increase the pressure and temperature to a pressur...

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PUM

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Abstract

A diamond polycrystal having such a property that, in a Vickers hardness test carried out under conditions prescribed in JIS Z 2244:2009, the value of the ratio of d' to d, i.e., (d' / d), is 0.98 or less, wherein d represents the length of a diagonal line in a first Vickers flaw which is formed on the surface of the diamond polycrystal when a Vickers indenter is pressed at a test load of 4.9 N against the surface of the diamond polycrystal, and d' represents the length of a diagonal line in a second Vickers flaw which remains on the surface of the diamond polycrystal after the release of the test load from the diamond polycrystal.

Description

technical field [0001] The present disclosure relates to diamond polycrystals and tools comprising the same. Background technique [0002] The diamond polycrystal has excellent hardness, has no directionality of hardness and is not cleavable. Therefore, diamond polycrystals are widely used in tools such as cutting inserts, dressers and dies, as well as drill bits and the like. [0003] Conventional diamond polycrystals are obtained by mixing raw diamond powder with sintering aids and bonding agents at high pressures and temperatures where diamond is thermodynamically stable (generally, pressures of about 5 to 8 GPa and temperatures of about 1300 to 2200°C). sintered together. Useful examples of sintering aids include: iron group metals such as Fe, Co or Ni; carbonates such as CaCO 3 ;Wait. Examples of useful binders include ceramics, such as SiC. [0004] The diamond polycrystal obtained by the above method contains a sintering aid and a bond. Sintering aids and binder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52B23B27/14B23B27/20B23C5/16
CPCB23C2226/315B23B27/20B23C5/16C04B35/528C04B35/645C04B2235/5454C04B2235/425C04B2235/427C04B2235/72C04B2235/723C04B2235/781C04B2235/785C01B32/25C22C26/00C01P2004/64C01P2006/90C30B29/04
Inventor 角谷均山本佳津子
Owner SUMITOMO ELECTRIC IND LTD
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