JIN Ying ^1,2, BAO Zhenhong ³, CHEN Bing ^{1 ,2}, YOU Wen ¹, ZHANG Huaizhong ⁴

(1. Ceramic ResearchInstitute ofLight Industry of China, Jingdezhen 333001, Jiangxi, China; 2. National Ceramic Product Quality Supervision and Inspection Center (Jiangxi), Jingdezhen 333001, Jiangxi, China; 3. Jingdezhen Ceramic Institute, Jingdezhen 333403, Jiangxi, China; 4. Jiangxi Guanyi Grinding Co., Ltd., Fengxin 330700, Jiangxi, China)

Abstract: The influence of multi-nucleating agents (P₂O₅ with TiO₂+ZrO₂+P₂O₅) on nucleation and crystallization of Li₂O-A1₂O₃-SiO₂ (LAS) system glass ceramics was investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscope (SEM). Results showed that when the LAS system glass ceramics were prepared by sintering method, the type and content of nucleating agent could affect the crystal morphology, but didn’t change the phase composition. evenwithout any nucleating agent, the product with a certain degree of crystallinity would be obtained. Adding a moderate amount of nucleating agent can reduce the activation energy to promote the crystallization of glass ceramics at a lower temperature. In this research, P₂O₅ was beneficial to the crystallization of β-spodumene solid solution in fiber shape, while TiO₂ and ZrO₂ were in favor of the crystallization of β-spodumene solid solution in particle shape. Along with the increase of ZrO₂ content, the particle size was decreased. When the addition content of TiO₂, ZrO₂, P₂O₅ was 2%, 4% and 4% respectively, the coefficient of thermal expansion of glass ceramic was 0.91×10^-6/°C, and the strength reached 85.93 MPa.
Key words: glass ceramic; nucleating agent; sintering method; Li₂O-A1₂O₃-SiO₂