The microanalysis of the bonding condition between coated diamond and matrix

Abstract

Ti, Mo, and Cu were plated on the diamond surface by magnetron sputtering method. The compression strength of Ti-coated diamond was measured; the structure of the diamond surface after vacuum heat treatment was analyzed by XPS. By the SEM analysis and the bending stress testing experiments, the authors researched the interface bonding condition of the coated diamond. The research revealed that the coatings on the diamond surface can protect the diamond well, and they also avoided or decreased the erosion of the diamond by matrix. The bonding strength between the diamond and the matrix was improved after plated Ti and Mo, but it was greatly influenced by the matrix composition and the hot-pressing technics. The plated metal and diamond could form local chemical union at the hot-pressing temperature of 830–840 °C.