Polycrystalline diamond compact with excellent electric conductivity and method for manufacturing polycrystalline diamond compact

Abstract

The invention discloses a polycrystalline diamond compact with excellent electric conductivity and a method for manufacturing the polycrystalline diamond compact. The polycrystalline diamond compact is characterized in that polycrystalline diamond layers of the compact comprise 75-85% of diamond micro-powder, 12-20% of hard alloy powder and 3-5% of nano-metal bonding agents, and the diamond micro-powder includes 60-70% of diamond micro-powder without boron and 30-40% of diamond micro-powder with boron; the hard alloy powder comprises 85-90% of WC powder, 8-12% of Co powder, 1.5-2% of Ti powder and 0.5-1% of TaC powder. The polycrystalline diamond compact and the method have the advantages that the shortcoming that the electric conductivity and the heat-resistance of a polycrystalline diamond compact manufactured in the prior art cannot be simultaneously taken into consideration can be overcome by the aid of conductive and heat-resistant materials such as the boron and tungsten carbide in formulas of the polycrystalline diamond layers, the polycrystalline diamond compact manufactured by the aid of the method is excellent in electric conductivity and heat-resistance simultaneously as compared with the polycrystalline diamond compact manufactured in the prior art, and discharge, welding machining and service requirements on the compact can be met; the method for manufacturing the polycrystalline diamond compact is simple in technology and high in operability, and the polycrystalline diamond compact can be conveniently manufactured by the aid of the method.

Description

technical field [0001] The invention belongs to the technical field of diamond and hard alloy composite materials, and in particular relates to a diamond polycrystalline composite sheet with good electrical conductivity and a preparation method thereof. Background technique [0002] Diamond polycrystalline composite sheet is a kind of superhard composite material made of diamond micropowder as raw material, cemented carbide as matrix, and sintered under high temperature and high pressure conditions through a specific synthesis process. The composite sheet has the advantages of high diamond hardness, good wear resistance and strong impact resistance of cemented carbide, and is widely used in the field of cutting non-ferrous metals and difficult-to-machine non-metallic materials. The common diamond polycrystalline composite sheet in the prior art is sintered from diamond-cobalt system, and its bonding phase is composed of cobalt, which has a certain conductivity and has the ad...

AI Technical Summary

Problems solved by technology

The common diamond polycrystalline composite sheet in the prior art is sintered from diamond-cobalt system, and its bonding phase is composed of cobalt, which has a certain conductivity and has the advantages of electric discharge machining. The phase is metal cobalt, so it has the weakness of low heat resistance, and only has a heat resistance of about 700°C

The other is sintered from diamond-carbonate system, and its bonding phase is composed of carbonate, which has excellent heat resistance, but it is not conductive, so it cannot be used for electric discharge machining

When the above-mentioned polycrystalline diamond composite sheet is made into a cutting tool, because it cannot have good electrical conductivity and heat resistance at the same time, it is difficult to discharge and weld or it is impossible to perform discharge and welding.