Diamond compact and preparation method thereof

Abstract

The invention provides a diamond compact. The diamond compact is mainly composed of polycrystalline diamond particles, wear-resistant metal compound coatings and metal adhesives, wherein the wear-resistant metal compound coatings are formed on the surfaces of the polycrystalline diamond particles, and the metal adhesives are filled between the adjacent wear-resistant metal compound coatings. The invention further provides a preparation method of the diamond compact. The preparation method comprises the following steps of pretreating the diamond particles, forming the wear-resistant metal compound coatings, cleaning a matrix and pressing and sintering the compact. Specifically, the wear-resistant metal compound coatings with good wear resistance are deposited on the surfaces of the diamondparticles firstly to form composite diamond particles, and after the composite diamond particles are uniformly mixed with the metal adhesives, high-temperature and high-pressure sintering treatment isconducted on the surface of the clean hard alloy matrix to prepare the polycrystalline diamond compact. Therefore, the diamond compact has good wear resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of superhard material processing, and in particular relates to a diamond composite sheet and a preparation method thereof. Background technique [0002] Diamond is widely used in various fields due to its high hardness, high chemical stability, high wear resistance and low friction coefficient. During processing and use, the use efficiency is often reduced due to processing graphitization. Diamond tools refer to finished products with diamond particles as cutting materials, which are pressed, sintered and processed into certain shapes and uses with the help of binders or other auxiliary materials, such as abrasive tools, knives and drilling tools. During use, diamond has poor chemical affinity to some bonding metals or alloys, and is not easily wetted by them, resulting in poor application performance. Due to the low bonding strength between the bonding agent and the abrasive, the diamond abrasive is very ...

AI Technical Summary

Problems solved by technology

[0004] Coated tools use vapor deposition technology to deposit one or more layers of wear-resistant refractory metals or metal compounds on the surface of superhard blades such as ceramics, diamond or cubic boron nitride. Wear resistance and service life, but because the wear-resistant material is formed on the surface of the super-hard blade, there is still a problem of bonding strength between the wear-resistant material and the super-hard blade, and with the use of the coated tool wear resistance The material will also be lost. When the wear-resistant material is lost to a certain extent, although the loss of the superhard blade is small, it will seriously affect the service life of the coated tool.

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