The influence of sintering temperature on the mechanical properties and microstructure of diamond grinding wheels

In this study, diamond grinding wheel specimens were fabricated by using diamond abrasives and a ceramic bond to investigate the influence of sintering temperature on their performance. The optimal sintering temperature and microstructure were systematically analyzed through scanning electron microscopy (SEM), total porosity measurements, flexural strength tests, and Rockwell hardness evaluations. The results indicate that within the sintering temperature range of 660°C to 740°C, the total porosity of the grinding wheels initially decreases and then increases with rising temperature. Similarly, the flexural strength first increases and then decreases. At the sintering temperature of 700°C, the specimens exhibit peak mechanical properties, achieving a maximum flexural strength of 54.8 MPa. SEM observations reveal that at this optimal temperature, the ceramic bond forms dense bridges between diamond grains, ensuring improved wettability and strong interfacial bonding.