Controlling the Phase Content of Li2O-Al2O3-SiO2-B2O3-BaO Glass-Ceramic Bonds with CTE Close to cBN

Abstract

Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic bonds with CTE close to cBN for vitrified cBN composites was prepared via a two-step heat treatment method. The crystalline phases were identified by XRD and the phase content was analyzed by WPF refinement. The increasing crystallization temperature would promote the precipitation of more LiAlSi3O8 phase in the glass-ceramic, which was conducive to the preparation of low CTE glass-ceramics. Besides, a crystallization temperature below 625 °C was necessary for the preparation of Li2O-Al2O3-SiO2-B2O3-BaO glass-ceramic with CTE close to cBN (3.50 × 10− 6 °C− 1), proving that the two-step heat treatment was an effective sintering process to the preparation of low CTE glass-ceramic bonds for vitrified cBN composites.