Preparation of diamond/vitrified bond composite sintered by sol-gel method and its performance characterization

Abstract

Based on the diamond and inorganic sol, sol-gel(S-G) method was used to prepare diamond/vitrified bond composite powder and then the bulk samples were obtained after the powder was pressed and sintered,and the bond composite powder was characterized by XRD, SEM, electronic universal testing machine, Rockwell hardness tester, etc. The results show that diamond/vitrified bond composite powder with good uniformity can be prepared by S-G method, and the bending strength, Rockwell hardness, volume density and porosity of samples sintered at 680℃/2h are 58.54MPa,55.8HRB,1.74g/cm3and 24.16%, respectively; when these samples were obtained by melting method, the corresponding figures are 51.32MPa, 72.5HRB,1.92g/cm3and 21.47%, respectively. Compared to the melting method, the microstructure of grinding disc prepared by S-G method is uniform and high quality is observed on the machined surface of TC4 titanium alloy, whose Ra reaches 0.051μm.

Keywords

• sol-gel method
• diamond
• vitrified bond
• property