High-toughness wear-resistant polycrystalline diamond compact and preparation method thereof

A technology of polycrystalline diamond and composite sheet, which is applied in the direction of metal material coating process, ion implantation plating, coating, etc., and can solve the problems of poor adhesion between polycrystalline diamond layer and hard alloy substrate, thermal conductivity, and heat resistance. Anti-oxidation, insufficient chemical inertness, reduced service life of polycrystalline diamond composite sheets, etc., to achieve good sintering promotion, excellent wear resistance, high hardness and low density

Active Publication Date: 2020-12-11
ZHONGNAN DIAMOND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, there are still some problems in the preparation of polycrystalline diamond compacts. One is due to the structural defects existing on the surface of ordinary diamond particles, and the relative strength, hardness, elastic modulus and structure between it and the binder. The large difference leads to abnormal fracture or early loss of diamond in the application process of the polycrystalline diamond composite sheet, which reduces the service life of the polycrystalline diamond composite sheet; the second is the polycrystalline diamond composite sheet made of ordinary diamond grains. In addition to a series of advantages of diamond single crystal, however, in practical applications, there are still deficiencies in thermal conductivity, heat resistance, oxidation resistance, and chemical inertness.
Third, due to the large difference in physical performance parameters such as thermal expansion coefficient and elastic modulus between the polycrystalline diamond layer and the cemented carbide substrate, the adhesion between the polycrystalline diamond layer and the cemented carbide substrate is not strong, and the impact resistance is poor. The polycrystalline diamond layer is easy to peel off and break, causing the tool to fail

Method used

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  • High-toughness wear-resistant polycrystalline diamond compact and preparation method thereof
  • High-toughness wear-resistant polycrystalline diamond compact and preparation method thereof
  • High-toughness wear-resistant polycrystalline diamond compact and preparation method thereof

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Embodiment 1

[0041] Such as figure 1 As shown, the high-toughness and wear-resistant polycrystalline diamond compact of this embodiment includes a cemented carbide substrate 1 and Si that is sequentially arranged on the cemented carbide substrate 1. 3 N 4 Coating 2, powder transition layer 3 and polycrystalline diamond layer 4; the polycrystalline diamond layer is composed of the following raw materials in weight percentage: carbon nanotube coated diamond powder 95%, graphene 0.3%, carbon fiber 0.2% and binder 4.5%; the powder transition layer is composed of the following raw materials in weight percentage: 40% cemented carbide powder, 56% carbon nanotube-coated diamond powder, 1.5% graphene and 2.5% binder; Described graphene selects thickness 6~8nm, the graphene nanosheet of wide 5 μ m; 3 N 4 The thickness of the coating is 7 μm; the mass ratio of the powder transition layer and the polycrystalline diamond layer is 0.2:1; the carbon nanotube-coated diamond powder is a chemical vapor p...

Embodiment 2

[0055] The high-toughness and wear-resistant polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and Si that is sequentially arranged on the cemented carbide substrate. 3 N 4 Coating, powder transition layer and polycrystalline diamond layer; The polycrystalline diamond layer is made up of the raw material of following percentage by weight: carbon nanotube coated diamond micropowder 98%, graphene 0.1%, carbon fiber 0.1% and bonding agent 1.8%; the powder transition layer is made up of the following raw materials in weight percentage: 48% of cemented carbide powder, 50% of carbon nanotube-coated diamond powder, 0.5% of graphene and 1.5% of binding agent; the graphene Graphene nanosheets with a thickness of 6-8 nm and a width of 5 μm are selected; the Si 3 N 4 The thickness of the coating is 8 μm; the mass ratio of the powder transition layer and the polycrystalline diamond layer is 0.2:1.5; the carbon nanotube-coated diamond powder...

Embodiment 3

[0069] The high-toughness and wear-resistant polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and Si that is sequentially arranged on the cemented carbide substrate. 3 N 4 coating, powder transition layer and polycrystalline diamond layer; the polycrystalline diamond layer is made up of the following raw materials in weight percentage: carbon nanotube coated diamond powder 96.5%, graphene 0.2%, carbon fiber 0.15% and binding agent 3.15%; the powder transition layer is made up of the following raw materials in weight percentage: 44% of cemented carbide powder, 53% of carbon nanotube-coated diamond micropowder, 1% of graphene and 2% of binding agent; the graphene Graphene nanosheets with a thickness of 6-8 nm and a width of 5 μm are selected; the Si 3 N 4 The thickness of the coating is 6-8 μm; the mass ratio of the powder transition layer and the polycrystalline diamond layer is 0.2:1.2; the carbon nanotube-coated diamond powder...

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Abstract

The invention relates to a high-toughness wear-resistant polycrystalline diamond compact and a preparation method thereof. The diamond compact comprises a hard alloy matrix, and a Si3N4 coating, a powder transition layer and a polycrystalline diamond layer which are sequentially arranged on the hard alloy matrix; and the polycrystalline diamond layer is prepared from the following raw materials of, in percentage by weight, 95 %-98 % of carbon nanotube coated diamond micro-powder, 0.1 % -0.3 % of graphene, 0.1 %-0.2 % of carbon fiber and 1.8 %-4.5 % of binding agent. According to the diamond compact and the method, the carbon nanotube coated diamond micro-powder with double characteristics of diamond and carbon nanotube is adopted, the Si3N4 coating is deposited on the surface of the hard alloy matrix, and the powder transition layer is arranged between the coating and the polycrystalline diamond layer, so that the excellent performance of the polycrystalline diamond layer is ensured, and meanwhile, the bonding strength between the hard alloy matrix and the polycrystalline diamond layer is greatly enhanced, and then the diamond compact has wear resistance and excellent impact toughness.

Description

technical field [0001] The invention belongs to the technical field of superhard composite materials, and in particular relates to a high-toughness wear-resistant polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] The diamond cutting tools that countries are competing to develop nowadays are polycrystalline diamond-tungsten carbide composite sheet cutting tools. The polycrystalline diamond composite sheet has high hardness, good wear resistance, and isotropic, conductive, and The advantages of weldability and economy make it widely used in the field of processing non-ferrous metals and difficult-to-process non-metallic materials. [0003] In the prior art, there are still some problems in the preparation of polycrystalline diamond compacts. One is due to the structural defects existing on the surface of ordinary diamond particles, and the relative strength, hardness, elastic modulus and structure between it and the binder....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F7/04B22F1/00B22F9/04B22F3/10B22F3/14C23C14/35C23C14/06
CPCB22F1/0003B22F7/04B22F9/04B22F3/1007B22F3/14C23C14/35C23C14/0652C23C14/0036B22F2007/042B22F2009/043
Inventor 张涛卢灿华朱培宋子衡邱林
Owner ZHONGNAN DIAMOND CO LTD
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