Effect of heat treatments on the Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bond and the glass-ceramic bond cBN grinding tools

Influence of heat treatments on the Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bond and the glass-ceramic bond cBN grinding tools had been methodically discussed. The results revealed that the different heat treatments mainly varied the content of LiAlSi2O6 and LiAlSi3O8 in the glass-ceramic bonds which in turn resulted in the variation of bonds' CTE and affected the performance of glass-ceramic bond cBN grinding tools in bending strength. In addition, results of XPS indicated chemical bonds such as NAl, NSi, and NLi bonds were generated at the interface between the bonds and cBN abrasives during the sintering process, which acted as a vital part in improving the holding power for the bonding of glass-ceramic bonds and cBN abrasives. In this study, glass-ceramic bond cBN grinding tools sintered at 860°C for 120 min presented the highest bending strength (89.71 MPa) with the highest potential for high performance grinding tools among all the samples.