Method for manufacturing diamond compact

Abstract

The invention provides a method for manufacturing a polycrystalline diamond compact and belongs to the fields of oil drilling and engineering machinery. The diamond compact comprises a matrix and composite layers, wherein the composite layers are manufactured by stirring and sintering tungsten carbide micropowder, a metal bond, a grain growth inhibitor and diamond micropowder, and comprise the composite layer I, the composite layer II and the composite layer III which sequentially cover and coat the upper end of the matrix; the composite layer I and the composite layer II are bonded by the metal bond; and the composite layer II and the composite layer III are also bonded by the metal bond. The diamond compact manufactured by the method avoids residual stress between a hard alloy matrix baseplate and the polycrystalline diamond composite layers, therefore, is high in strength, and excellent in tenacity, and has the characteristics of high impact toughness and bending resistance, and the like. Accordingly, the polycrystalline diamond compact is improved in usability and prolonged in service life.

Description

technical field

[0001] The invention belongs to the technical fields of oil drilling and engineering machinery, in particular to a method for manufacturing a polycrystalline diamond composite sheet in the fields of oil drilling and engineering machinery. Background technique

[0002] The traditional polycrystalline diamond compact requires the use of cemented carbide substrate as the base, and the diamond powder and binder are grown on the cemented carbide base by high temperature and high pressure. Due to the residual stress of the cemented carbide substrate and the polycrystalline diamond composite layer, the strength of the traditional diamond composite sheet is not very high, and the toughness is poor.

[0003] In order to improve the bonding strength of the cemented carbide base and the polycrystalline diamond composite layer, by reducing the residual stress of the cemented carbide base and the polycrystalline diamond composite layer, increasing the bonding area of ​​th...