THEORETICAL ANALYSIS OF COMPOSITE BUTTON COMPOSED OF DIAMOND cBN AND TUNGSTEN CARBIDE

This paper presents a new type of composite button composed of diamond and cubic boron nitride-enhanced tungsten carbide. The working properties such as hardness, bending strength, and abrasion ratio of this type of composite button increases by a large margin because of the integration of the boron-sintering promotion and enhancement, the Ni-P activation sintering, and the addition of cubic boron nitride. In addition, a transitional zone between diamond particles and matrix alloy can effectively prevent the carbon atoms of the diamond surface from diffusion, a key element to protect diamond from deformation and damage at a high temperature. Furthermore, this transitional zone increases greatly the bonding strength between diamond and matrix alloy.