Effect of MgO Content on Crystallization Behavior of RSCAF System Glass-Ceramics

Abstract

Abstract: The glass-ceramics were prepared by using MgO to replace part of CaO in the R₂O-SiO₂-CaO-Al₂O₃-F (RSCAF) system, and the effect of MgO content on the crystallization behavior of the glass-ceramics was investigated systematically. The results show that the main crystalline phase of the glass-ceramics is canasite after heat treatment when the RSCAF system without MgO (CaO content is 16.5%, mass fraction, the same below). Then, the crystalline phase in the microscopic morphology of the glass-ceramics presents a indented appearance and the density of the glass-ceramics is less than that of the basic glass. As the content of MgO in the RSCAF system is in the range of 0% to 3%, the crystallinity of the glass-ceramics reduces with the decrease of CaO content. Along with the further increase of MgO content and the decrease of CaO content in the system, the main crystalline phase of the glass-ceramics transforms gradually from canasite into diopside, and the crystalline diopside phase with columnar and flake-shaped appearance increases in the microscopic morphology and the density of glass-ceramics increases gradually. When the content of MgO in the system increases to 4% (CaO content decreases to 12.5%), the main crystalline phase of the glass-ceramics completely changes to diopside, and the crystallinity of diopside increases compared with that of the main crystalline canasite phase glass-ceramics, and the density of the glass-ceramics is higher than that of the basic glass.

Key words: RSCAF system glass-ceramics, crystallization behavior, canasite, diopside, density

CLC Number:

TQ171

XU Guoliang, LUO Yunlong, WANG Fu, LIU Laibao, LIAO Qilong. Effect of MgO Content on Crystallization Behavior of RSCAF System Glass-Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(6): 2083-2089.

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