Diamond and cemented carbide substrate coefficient of thermal expansion

PDC as a new superhard composite products, has been widely used in many fields; particularly in the oil drilling, due to the particularity of usage of PDC put forward higher Abrasive grinding wheel for quality. PDC is at high pressure, high temperature prepared from. Theoretically hope polycrystalline diamond layer is completely densified, but the actual production process, the total unavoidable defects in the diamond layer, such as: inclusions, porosity, etc., as shown in PDC PDC. Diamond and  Diamond blade  carbide substrate  cubic boron nitride  with a thermal expansion coefficient, elastic modulus and other physical properties of the difference is large, inevitably at the interface, and the defects in the diamond layer are present at a large number of residual stresses, which requires the following process to PDC to eliminate stress treatment to ensure the quality of the PDC.