High-hardness polycrystalline diamond and process for producing the same

A technology of polycrystalline diamond and high hardness, which is applied in metal processing equipment, turning equipment, manufacturing tools, etc., and can solve the problems that diamond is not applicable and easy to crack

Active Publication Date: 2011-04-13
SUMITOMO ELECTRIC IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the diamond is a single crystal, it is easily cracked, and its hardness is anisotropic, so this diamond cannot be used for a wide range of tool applications

Method used

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  • High-hardness polycrystalline diamond and process for producing the same
  • High-hardness polycrystalline diamond and process for producing the same
  • High-hardness polycrystalline diamond and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-10 and comparative example 1-4

[0139] A variety of non-graphite carbon substances are added to graphite powder with excellent crystallinity with a particle size of 0.05-10 μm and a purity of at least 99.95%, or synthetic diamond powder with a particle size of 0.05-3 μm, such as ultrafinely pulverized into powder Graphite, glassy carbon powder, fullerene powder, carbon nanotube powder, and then the resultant is filled into a Mo package and sealed to prepare a raw material composition.

[0140] The raw material composition is treated for 30 minutes under different pressures and different temperatures by using a belt-type ultra-high pressure generating device to prepare high-hardness polycrystalline diamond.

[0141] The generated phase of the prepared polycrystalline diamond was identified by X-ray diffraction technique, and the size of the constituent particles was detected according to the observation results of TEM. In addition, the surface of the obtained high-hardness polycrystalline diamond is ground in...

Embodiment 11-19

[0150] The raw materials used are composed of the following substances: graphite powder with excellent crystallinity having a particle size of 0.05-10 μm and a purity of at least 99.95%; the above-mentioned ultrafinely pulverized graphite powder; glassy carbon powder; fullerene powder and carbon nanotube powder. These powders were mixed and filled into Mo packages and sealed, and then the packages were treated at different pressures and temperatures for 30 minutes using a belt-type ultra-high pressure generator to prepare samples.

[0151] The generated phase of each sample was identified by X-ray diffraction technique, and the size of the constituent particles of each sample was detected according to the observation result of TEM. In addition, the surface of each sample is ground into a mirror surface, and then the hardness of the mirror surface is measured with a micro-Knoop hardness tester, and the Raman spectrum is measured on the ground surface to obtain the position of t...

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Abstract

A polycrystalline diamond which has sufficient strength, hardness, and heat resistance and is dense and homogeneous. It is usable in working tools such as cutting bits, dressers, and dies and in digging bits. Also provided is a cutting tool employing the polycrystalline diamond at the cutting edge. The high-hardness polycrystalline diamond is a polycrystalline diamond which consists substantiallyof diamond obtained by direct conversion through sintering from a raw material composition containing a nondiamond carbon material under extra-high-pressure ultra-high-temperature conditions without the addition of a sintering aid or a catalyst. The polycrystalline diamond has a structure comprising a mixture of fine diamond crystal grains having a maximum grain diameter of 100 nm or smaller and an average grain diameter of 50 nm or smaller and coarse diamond crystal grains having a grain diameter of 50-10,000 nm and a platy or granular shape.

Description

technical field [0001] The present invention generally relates to polycrystalline diamonds and methods of preparing polycrystalline diamonds, and in particular to polycrystalline diamonds having excellent high hardness, excellent high strength and excellent thermal properties, which can be used in cutting tools, shapers , molds and other tools, and digging bits, etc., the invention also relates to methods of preparing such polycrystalline diamonds and cutting tools having cutting edges formed from such polycrystalline diamonds. Background technique [0002] Polycrystalline diamonds used in conventional cutting tools, shapers, molds and other tools, and excavation bits, etc., use Co, Ni, Fe or similar iron group metals, SiC or similar ceramics, etc. as sintering aids or bonds made from agents. Also known are polycrystalline diamonds produced using carbonates as sintering aids (see Patent Documents 1 and 2). [0003] By sintering powdered diamond with sintering aids and / or b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03B29/04C04B35/52B01J3/06B23B27/20
Inventor 角谷均
Owner SUMITOMO ELECTRIC IND LTD
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