HU Xiao，CHENG Yu，YUAN Qin，FANG JingXian
(Nanjing University of Science and Technology, Ministry of Industry and Information Technology High-end Equipment Manufacturing Technology Collaborative Innovation Center, Nanjing 210000, Jiangsu, China)

Abstract: In this study, a series of tests were carried out to investigate the feasibility of producing vitrified bond diamond grinding wheels by microwave sintering. The mechanical properties, phase composition, and microstructure of the specimens sintered by microwave were analysed. The experimental results revealed that the sintering of vitrified bond diamond grinding wheels by microwave could be realized in a short time under pressureless conditions. The specimen sintered at 800 °C in argon for 30 min had optimal mechanical properties. Its porosity, Rockwell hardness, and bending strength were 34.88%, 62.9 HRB, and 50 MPa. The microstructure showed that the abrasive grains of the diamond could be effectively wetted and coated by the vitrified bond.

Key words: microwave sintering; vitrified bond; diamond; mechanical properties; microstructure