Diamond compact and preparation method thereof

A technology of diamond composite sheet and diamond layer, applied in the field of diamond composite sheet and its preparation, can solve problems such as insufficient densification of diamond composite sheet, and achieve the effects of fine grain size, alleviating abnormal growth and increasing contact area.

Active Publication Date: 2018-06-05
FUNIK ULTRAHARD MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the method of reducing the content of the Co phase component in the WC / Co cemented carbide substrate has led to the problem of insufficient densification of the diamond compact

Method used

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  • Diamond compact and preparation method thereof
  • Diamond compact and preparation method thereof
  • Diamond compact and preparation method thereof

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preparation example Construction

[0052] According to one aspect of the present invention, a kind of preparation method of above-mentioned diamond compact, described method comprises the following steps:

[0053] (a) Preparation of powder: mixing the diamond layer raw materials and adding a dispersant, then vibrating, mixing and filtering in a benzene solution to obtain a mixed powder, and then vacuum drying the mixed powder to obtain a diamond layer powder;

[0054] (b) Substrate preparation: fully mix the raw materials of the tungsten carbide / cobalt cemented carbide layer, and hot press sinter to obtain the tungsten carbide / cobalt cemented carbide substrate;

[0055] (c) Composite sheet assembly: the diamond layer powder obtained in step (a) is pre-pressed and assembled with a tungsten carbide / cobalt cemented carbide substrate to obtain a diamond composite;

[0056] (d) High-temperature and high-pressure synthesis: use a six-sided top press to perform high-temperature and high-pressure synthesis on the diamo...

Embodiment 1

[0068] A diamond compact, which includes a diamond layer and a tungsten carbide / cobalt cemented carbide layer;

[0069] The diamond layer is mainly composed of the following raw materials in parts by weight: 77 parts of diamond powder with a particle size of 0.1 μm, 15 parts of a binder with a particle size of 0.1 μm and 8 parts of a grain inhibitor with a particle size of 0.1 μm,

[0070] The above-mentioned grain inhibitor is composed of SiC, WC and cBN, and the volume ratio of the three is 3:1:2;

[0071] The above-mentioned binder is a mixture of Ti, Ni and Cr, and its mass ratio is 5:1:3;

[0072] The tungsten carbide / cobalt cemented carbide layer is mainly composed of the following raw materials in parts by weight: 75 parts of tungsten carbide powder, 15 parts of cobalt powder and 10 parts of diamond micropowder,

[0073] The particle size of the above-mentioned diamond micropowder is 10 μm;

[0074] The preparation method of described diamond compact comprises the fol...

Embodiment 2

[0082] A diamond compact, which includes a diamond layer and a tungsten carbide / cobalt cemented carbide layer;

[0083] The diamond layer is mainly composed of the following raw materials in parts by weight: 89 parts of diamond powder with a particle size of 1 μm, 10 parts of a binder with a particle size of 0.5 μm and 1 part of a grain inhibitor with a particle size of 0.5 μm,

[0084] The above-mentioned grain inhibitor is composed of SiC, WC and cBN, and the volume ratio of the three is 2:3:1;

[0085] The above binder is SiO 2 and TiC in a mass ratio of 3:1;

[0086] The tungsten carbide / cobalt cemented carbide layer is mainly composed of the following raw materials in parts by weight: 80 parts of tungsten carbide powder, 10 parts of cobalt powder and 10 parts of diamond micropowder,

[0087] The particle size of the above-mentioned diamond micropowder is 30 μm;

[0088] The preparation method of described diamond compact comprises the following steps:

[0089] (a) Pre...

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Abstract

The invention relates to the technical field of super-hard composite materials and provides a diamond compact and a preparation method thereof. The diamond compact comprises a diamond layer and a tungsten / cobalt carbide hard alloy layer, a grain inhibitor is added into the diamond layer and serves as a hard phase to be doped into polycrystal, and abnormal growth of diamond grains is alleviated. Inaddition, by doping of diamond micropowder into the tungsten / cobalt carbide hard alloy layer, a grain growth promoting effect of the Co element at an interface can be inhibited. Furthermore, due to containing of diamond in the diamond layer and the tungsten / cobalt carbide hard alloy layer, binding force of the diamond compact at the interface is increased, and the diamond compact is tighter in combination. Therefore, the diamond compact has advantages of fine grains and compact microstructure.

Description

technical field [0001] The invention relates to the technical field of superhard composite materials, in particular to a diamond composite sheet and a preparation method thereof. Background technique [0002] Diamond composite sheet, also known as diamond and cemented carbide composite material, is sintered by 0.5-1.0mm thick diamond and a few millimeters thick WC / Co (tungsten carbide / cobalt) cemented carbide substrate under high temperature and high pressure. of. This material has the hardness and wear resistance of diamond, and has excellent impact resistance due to the existence of cemented carbide substrate. It is an excellent composite material. It is widely used in the manufacture of oil drill bits, geological drill bits and cutting tools. The grain size of the diamond in the diamond composite sheet has an important influence on the product performance. The smaller the grain size, the better the impact toughness. At the same time, it can have both hardness and wear r...

Claims

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Application Information

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IPC IPC(8): B22F7/02B22F3/14B22F3/10C22C26/00C22C29/08C01B32/25
CPCB22F3/10B22F3/14B22F7/02C22C26/00C22C29/08C22C2026/006
Inventor 马宁王彬彬黄红卫李丙文
Owner FUNIK ULTRAHARD MATERIAL
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