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A kind of high-toughness and wear-resistant polycrystalline diamond composite sheet and its preparation method

A technology of polycrystalline diamond and composite sheet, which is applied in the direction of metal material coating process, vacuum evaporation coating, coating, etc., can solve the problem of thermal conductivity, heat resistance and oxidation resistance, insufficient chemical inertness, polycrystalline diamond layer and Problems such as poor adhesion to the cemented carbide substrate and reduced service life of the polycrystalline diamond composite sheet achieve good sintering promotion, high hardness and low density, and excellent electrical conductivity.

Active Publication Date: 2022-06-07
ZHONGNAN DIAMOND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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  • A kind of high-toughness and wear-resistant polycrystalline diamond composite sheet and its preparation method
  • A kind of high-toughness and wear-resistant polycrystalline diamond composite sheet and its preparation method
  • A kind of high-toughness and wear-resistant polycrystalline diamond composite sheet and its preparation method

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Effect test

Embodiment 1

[0041] like figure 1 As shown, the high-toughness wear-resistant polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate 1 and a silicon carbide substrate 1 arranged on the cemented carbide substrate 1 in sequence. 3 N 4 Coating 2, powder transition layer 3 and polycrystalline diamond layer 4; the polycrystalline diamond layer is made up of the following raw materials by weight: carbon nanotube-coated diamond micropowder 95%, graphene 0.3%, carbon fiber 0.2% and binder 4.5%; the powder transition layer is composed of the following raw materials by weight: cemented carbide powder 40%, carbon nanotube-coated diamond micropowder 56%, graphene 1.5% and binder 2.5%; Described graphene selects graphene nanosheets with thickness of 6~8nm and width of 5μm; described Si 3 N 4 The thickness of the coating layer is 7 μm; the mass ratio of the powder transition layer and the polycrystalline diamond layer is 0.2:1; the carbon nanotube-coated diam...

Embodiment 2

[0055] The high-toughness and wear-resistant polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and Si successively arranged on the cemented carbide substrate. 3 N 4 A coating, a powder transition layer and a polycrystalline diamond layer; the polycrystalline diamond layer is composed of the following raw materials by weight: 98% of carbon nanotube-coated diamond micropowder, 0.1% of graphene, 0.1% of carbon fiber and a binder 1.8%; the powder transition layer is composed of the following raw materials by weight: 48% of cemented carbide powder, 50% of carbon nanotube-coated diamond micropowder, 0.5% of graphene and 1.5% of binder; 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; Depositing carbon nanotubes; the carbon nanotubes have a sing...

Embodiment 3

[0069] The high-toughness and wear-resistant polycrystalline diamond composite sheet of this embodiment includes a cemented carbide substrate and Si successively arranged on the cemented carbide substrate. 3 N 4 Coating, powder transition layer and polycrystalline diamond layer; the polycrystalline diamond layer is composed of the following raw materials by weight: 96.5% of carbon nanotube-coated diamond micropowder, 0.2% of graphene, 0.15% of carbon fiber and binder 3.15%; the powder transition layer is composed of the following raw materials by weight: 44% of cemented carbide powder, 53% of carbon nanotube-coated diamond micropowder, 1% of graphene and 2% of binder; 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 fine powder is provided on the cat...

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Abstract

The invention relates to a high-toughness and wear-resistant polycrystalline diamond composite sheet and a preparation method thereof, comprising a cemented carbide substrate and Si which are sequentially arranged on the cemented carbide substrate 3 N 4 Coating layer, powder transition layer and polycrystalline diamond layer; the polycrystalline diamond layer is composed of the following raw materials in weight percentage: carbon nanotube coated diamond powder 95-98%, graphene 0.1-0.3%, carbon fiber 0.1% ~0.2% and binder 1.8~4.5%. The present invention adopts carbon nanotube coated diamond powder with dual characteristics of diamond and carbon nanotube to deposit Si on the surface of cemented carbide substrate. 3 N 4 The coating and the powder transition layer between the coating and the polycrystalline diamond layer greatly enhance the bonding strength between the two while ensuring the excellent performance of the polycrystalline diamond layer, making it wear-resistant and excellent impact toughness.

Description

technical field [0001] The invention belongs to the technical field of superhard composite materials, in particular to a high-toughness wear-resistant polycrystalline diamond composite sheet and a preparation method thereof. Background technique [0002] The diamond tool that is being developed in various countries today is the polycrystalline diamond-tungsten carbide composite tool. The advantages of weldability and economy make it widely used in the field of processing non-ferrous metals and difficult-to-machine non-metallic materials. [0003] In the prior art, there are still some problems in the preparation of polycrystalline diamond composite sheets. One is due to the structural defects existing on the surface of ordinary diamond particles, as well as the differences in strength, hardness, elastic modulus and structure between them and the binder. The large difference leads to abnormal fracture of the polycrystalline diamond composite sheet or early diamond shedding d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F1/12B22F9/04B22F3/10B22F3/14C23C14/35C23C14/06
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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