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Polycrystalline diamond compact with good heat-conducting property and preparation method thereof

A technology of polycrystalline diamond and thermal conductivity, which is applied in metal processing equipment, turning equipment, manufacturing tools, etc., can solve the problem of low thermal conductivity of polycrystalline diamond composite sheets, achieve excellent mechanical and thermal properties, increase contact area, and high The effect of hardness

Active Publication Date: 2020-12-18
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the problems in the prior art, the present invention provides a polycrystalline diamond composite sheet with good thermal conductivity and its preparation method, which can solve the problem of low thermal conductivity of the current polycrystalline diamond composite sheet

Method used

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  • Polycrystalline diamond compact with good heat-conducting property and preparation method thereof
  • Polycrystalline diamond compact with good heat-conducting property and preparation method thereof
  • Polycrystalline diamond compact with good heat-conducting property and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0036] The polycrystalline diamond composite sheet with good thermal conductivity of the present embodiment comprises a cemented carbide substrate and a polycrystalline diamond layer disposed on the cemented carbide substrate, and the polycrystalline diamond layer is composed of the following raw materials in weight percentage: graphene-coated 80% coated diamond powder, 10.5% submicron diamond powder, 0.3% carbon nanotube, 0.2% graphene and 9% binder; ~12μm, 20~25μm four kinds of particle size distribution of micropowder, among which the particle size of 4~6μm accounts for 5% of the total amount of graphene-coated diamond powder, and the particle size of 5~10μm accounts for 5% of the total amount of graphene-coated diamond powder. 17% of the total amount, the particle size of 8-12 µm accounts for 28% of the total amount of graphene-coated diamond powder, and the particle size of 20-25 µm accounts for 50% of the total amount of graphene-coated diamond powder; the submicron diamo...

Embodiment 2

[0050] The polycrystalline diamond composite sheet with good thermal conductivity of the present embodiment comprises a cemented carbide substrate and a polycrystalline diamond layer disposed on the cemented carbide substrate, and the polycrystalline diamond layer is composed of the following raw materials in weight percentage: graphene-coated 90% coated diamond powder, 5% submicron diamond powder, 0.2% carbon nanotube, 0.1% graphene and 4.7% binder; ~12µm, 20~25µm four kinds of particle size distribution of micropowder, the weight percentage of four kinds of particle size micropowder in graphene-coated diamond micropowder is 15%, 15%, 25%, 45% respectively; the submicron diamond The particle size of the micropowder is 0.5-1.0 μm; the graphene in the polycrystalline diamond layer raw material is a graphene nanosheet with a thickness of 6-8 nm and a width of 5 μm; the carbon nanotubes are multi-walled carbon nanotubes, multi-walled carbon nanotubes The outer diameter is 5-10nm,...

Embodiment 3

[0063] The polycrystalline diamond composite sheet with good thermal conductivity of the present embodiment comprises a cemented carbide substrate and a polycrystalline diamond layer disposed on the cemented carbide substrate, and the polycrystalline diamond layer is composed of the following raw materials in weight percentage: graphene-coated 85% coated diamond powder, 7.75% submicron diamond powder, 0.25% carbon nanotube, 0.15% graphene and 6.85% binder; ~12µm, 20~25µm four kinds of particle size distribution of micropowder; the weight percentage of four kinds of particle size micropowder in graphene-coated diamond micropowder is 10%, 16%, 26.5%, 47.5% respectively; the submicron diamond The particle size of the micropowder is 0.5-1.0 μm; the graphene in the polycrystalline diamond layer raw material is a graphene nanosheet with a thickness of 6-8 nm and a width of 5 μm; the carbon nanotubes are multi-walled carbon nanotubes, and the multi-walled carbon nanotubes The outer d...

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Abstract

The invention belongs to the technical field of diamond and hard alloy composite materials, and particularly relates to a polycrystalline diamond compact with good heat-conducting property and a preparation method thereof. The polycrystalline diamond compact comprises a hard alloy matrix and a polycrystalline diamond layer arranged on the hard alloy matrix, wherein the polycrystalline diamond layer comprises the following raw materials in percentage by weight: 75-85% of graphene coated diamond micro-powder, 10-15.5% of diamond micro-powder, 0.2-0.3% of carbon nanotubes, 0.1-0.2% of graphene and 4.7-9% of a binding agent. The graphene coated diamond micro-powder with double characteristics of diamond and graphene is adopted, so that the wettability of diamond particles and the binding agentis improved, the contact area of the diamond and the binding agent is effectively increased, the heat-conducting property of the interface of the diamond and the binding agent is greatly improved, and the prepared polycrystalline diamond compact has excellent mechanical and thermal properties.

Description

technical field [0001] The invention belongs to the technical field of diamond and hard alloy composite materials, and in particular relates to a polycrystalline diamond composite sheet with good thermal conductivity and a preparation method thereof. Background technique [0002] Polycrystalline diamond composite sheet is a composite material sintered by diamond powder and cemented carbide substrate under high temperature and high pressure environment. It is composed of polycrystalline diamond layer and cemented carbide substrate. Due to the high hardness and wear resistance of the polycrystalline diamond layer Good toughness, good toughness and weldability of the cemented carbide substrate make it widely used in geological and mineral drilling, non-metallic material processing and non-ferrous metal cutting. [0003] In the prior art, the polycrystalline diamond composite sheet made of cobalt, nickel, and iron as binders, due to the catalytic effect of cobalt, the diamond pa...

Claims

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Application Information

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IPC IPC(8): B22F7/04B22F3/10B22F3/24B22F9/04C22C47/14C22C49/12C22C49/14B23B27/14C22C101/10
CPCB22F7/04B22F3/101B22F3/24B22F9/04B22F3/1017C22C47/14C22C49/12C22C49/14B23B27/14B22F2007/042B22F2003/248B22F2009/043
Inventor 张涛卢灿华朱培宋子衡包玉合
Owner ZHONGNAN DIAMOND CO LTD
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