Super-thick polycrystalline diamond composite material, preparing method and application of super-thick polycrystalline diamond composite material

Abstract

The invention discloses a super-thick polycrystalline diamond composite material. A polycrystalline diamond layer and a hard alloy matrix are included. The hard alloy matrix is a cobalt containing matrix. The diameter of the polycrystalline diamond composite material is larger than or equal to 30 mm, and the thickness of the polycrystalline diamond layer is larger than or equal to 3 mm. Accordingto a composite material preparing method, the hard alloy matrix and at least one polycrystalline diamond micro powder layer are stacked, when the hard alloy matrix and one polycrystalline diamond micro powder layer are stacked, one face of the polycrystalline diamond micro powder layer makes contact with the hard alloy matrix, and the other face makes contact with a cobalt source layer; when the hard alloy matrix and at least two polycrystalline diamond micro powder layers are stacked, a cobalt source layer is laid between the polycrystalline diamond micro powder layers; and a high-temperatureand high-pressure sintering method is adopted to prepare and obtain a super-thick polycrystalline diamond composite layer. By adoption of the provided technology, the super-thick polycrystalline diamond composite material with abrasion resistance, impact resistance and other performance meeting the requirements can be obtained, and the material can be directly used for cutting, preparing and machining of a tool.

Description

technical field [0001] The invention relates to the technical field of machining materials, in particular to an ultra-thick polycrystalline diamond composite material, a preparation method and an application thereof. Background technique [0002] Polycrystalline diamond composite material (also known as diamond composite sheet, English name: Polycrystalline Diamond, often referred to as PCD) is widely used in the production of superhard tools. Compared with the knives made of traditional carbide, tool steel, ceramics and other materials, the knives made of polycrystalline diamond composite materials have high speed and high efficiency, energy saving and environmental protection, high machining accuracy, high machining surface finish, high wear resistance, high life, high Thermal conductivity and other advantages. The polycrystalline diamond composite material is made by sintering the polycrystalline diamond layer and the cemented carbide (WC-Co alloy) substrate at high temp...

AI Technical Summary

Problems solved by technology

[0007] 3) PCD with a polycrystalline diamond layer thickness greater than 2mm, due to the long infiltration distance of cobalt in the matrix in the polycrystalline diamond layer during the high temperature and high pressure sintering process, will lead to abnormal growth of diamond grains, etc., making The consistency and uniformity of the polycrystalline diamond layer cannot meet the requirements of subsequent processing and use

[0008] To sum up, ultra-thick polycrystalline diamond composites are difficult to prepare by the traditional "high pressure and high temperature infiltration sintering method", even if they are barely obtained, they cannot meet the requirements of use in terms of performance

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