Effects of heating temperature on interfacial microstructure and compressive strength of brazed CBN-AlN composite abrasive grits

Abstract

CBN-AlN composite abrasive grits and AISI 1045 steel were brazed using Ag-Cu-Ti active filler alloy by heating up to the temperature of 890, 900 and 920 °C, respectively, and then held at the temperature for 8 min. Optical microscope, scanning electron microscope and X-ray diffraction equipment were utilized to study the effects of heating temperature on the microstructure of the joining interface. The compressive strength of the brazed composite grits was also measured. The experimental results show that the atoms of Ti, Al, B and N have preferentially penetrated towards the joining interface of composite grits and filler alloy. The compounds of Ti-nitride, Ti-borides and Ti3AlN were formed in the reaction layer. Degradation effect was not made on the compressive strength of the CBN-AlN composite grits when the brazing process was carried out in the temperature range of 890–920 °C.