Hard alloy matrix for synthesis of polycrystalline diamond compact

Abstract

The invention provides a hard alloy matrix for synthesis of a polycrystalline diamond compact. The face, combined with a diamond, of the hard alloy matrix is an arc face and protrusions are evenly distributed on the arc face. Due to the fact that the face, combined with the diamond, of the hard alloy matrix is the arc face and the protrusions are arranged on the arc face, on one hand, the arranged arc face increases the contact area of a diamond layer and the hard alloy matrix so that the residual stress on the unit contact face can be reduced and the transverse pressure gradient in the process of polycrystalline diamond compact synthesis can be reduced, and therefore residual heat stress distribution in the diamond compact is improved. The protrusions arranged on the arc face can solve the problem of concentration of tensile stress. Thus, according to the arrangement, the residual stress on the unit contact face can be reduced and the reduction of stress concentration can be achieved, so that the binding force of the hard alloy matrix and the diamond is improved, and therefore the quality of the polycrystalline diamond is further improved.

Description

technical field [0001] The invention relates to the technical field of production of polycrystalline diamond materials, in particular to a cemented carbide matrix for synthesizing polycrystalline diamond composite sheets. Background technique [0002] Polycrystalline diamond composite sheet is a new type of composite material used in various fields such as oil and gas drilling or tool cutting, which is sintered by cemented carbide matrix and diamond powder under high temperature and high pressure. [0003] However, due to the different performance parameters such as thermal expansion coefficient and elastic modulus of cemented carbide and diamond, there will be residual stress inside the sintered polycrystalline diamond compact. The residual stress is distributed on the surface where the cemented carbide and diamond are combined, which affects the bonding force between the cemented carbide substrate and the diamond, and the greater the residual stress, the smaller the bondin...

AI Technical Summary

Problems solved by technology

The impact toughness of polycrystalline diamond composite sheets with residual stress is poor, which can easily lead to abnormal damage such as cracking and delamination, which seriously affects the quality of polycrystalline diamond

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