Effect of heat treatments on the Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bond and the glass-ceramic bond cBN grinding tools
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Abstract
Abstract 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 N Al, N Si, and N Li 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.
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