XIAO Zhuohao ¹, DONG Xiaofeng ¹, LUO Minhua ¹, LIANG Huaying ¹, LUO Wenyan ¹, YU Xinnan ¹,YI Weimin ², LI Xiuying ¹
(1. School of Materials Science and Engineering, Jingdezhen Ceramic Institute, Jingdezhen 333403, China;
2. Jiangxi Guanyi Abrasives Co., Ltd., Fengxin 330700, Jiangxi, China)

Abstract: MgO-A1₂O_3-SiO₂ glass was prepared by conventional melt cooling method, and cordierite-based glass-ceramics were obtained by heat treatment. The influence of ZrO₂/TiO₂ composite nucleating agent and heat treatment on crystallization behavior and thermal expansion coefficient of glass-ceramics was explored. The results show that theMgO-A1₂O_3-SiO₂system has a strong tendency to surface crystallization,and the addition of the nucleating agent can reduce the crystallization temperature, and it is beneficial to induce the homogeneous crystallization of the glass-ceramics and promote the phase transition of cordierite into indialite, which is beneficial to reduce the expansion coefficient of cordierite glass-ceramic material. With the complex crystal nucleus, the cordierite glass-ceramic material with the lowest thermal expansion coefficient of 1.03×10^-6/℃ can be obtained when the temperature is 1050 ℃ and the holding time is 60 min.

Key words: cordierite; low expansion coefficient; glass-ceramics; nucleating agent