Heat Treatment Process Optimization of Ultra-Low Expansion Glass-Ceramics

Abstract

Abstract: Li₂O-Al₂O₃-SiO₂ system transparent glass was prepared by melting method, and ultra-low expansion glass-ceramics were obtained by heat treatment with TiO₂, ZrO₂ and P₂O₅ as composite nucleating agents. The effects of heat treatment parameters on thermal expansioncoefficient of glass-ceramics were studied by orthogonal experiments. The optimal heat treatment parameters were obtained through calculation and analysis, that is, the nucleation temperature is 600 ℃, the nucleation time is 3 h, the crystallization temperature is 820 ℃, and the crystallization time is 5 h. The main crystalline phase of glass-ceramics obtained under this heat treatment process is β-quartz solid solution, and the thermal expansioncoefficient is 1.6×10^-8 ℃^-1. The crystallization and microstructure of glass-ceramics were studied by means of differential thermal analysis, X-ray diffraction analysis, scanning electron microscopy analysis and transmission electron microscopy analysis. The relationship between heat treatment process, thermal expansion properties and microstructure of glass-ceramics was analyzed. The results show that the thermal expansion coefficient of glass-ceramics is determined by the type and content of crystalline phase, and the size and content of crystalline phase which formed inside glass-ceramics are closely related to heat treatment process.

Key words: Li₂O-Al₂O₃-SiO₂ system glass-ceramics, low expansion, β-quartz solid solution, composite nucleating agent, heat treatment, transparency

CLC Number:

TQ171

ZHAO Chunxia, FAN Shigang, LIU Jie, HE Can, LI Yue. Heat Treatment Process Optimization of Ultra-Low Expansion Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(11): 3870-3876.

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