Effect of Heat Treatment Atmosphere on the Crystallization Behavior of SiBON Ceramic Materials

Abstract

Abstract: The crystallization phenomenon of fused silica ceramics in use has received much attention. In this paper, XRD, SEM, FT-IR and XPS were used to study the effects of phase structure, surface morphology and chemical bond on the crystallization behavior of SiBON ceramics. The results show that the precipitation of cristobalite can be effectively inhibited by sintering SiBON ceramics at 1 550 ℃ under the protection of nitrogen. In contrast, the crystallization inhibition effect of samples sintered at the same temperature in vacuum atmosphere is not significant. The phase composition of SiBON ceramics is amorphous SiBON, Si₃N₄, and BN. The mechanism of suppressing crystallization of SiBON ceramics is that the doping of B and N elements converts the Si—O—Si bonds in SiO₂ into B—O—Si and Si—O—N bonds, and the resulting Si—B—O—N amorphous structure improves the SiO₂ crystallization activation energy.

Key words: SiBON ceramics, cristobalite, crystallization, sintering atmosphere, element doping

CLC Number:

TB321

ZHANG Heng, WU Yun, LI Daoqian, LI Zhuolin, WANG Yiyang, WU Songsong, SUN Zhiyuan, WEN Guangwu. Effect of Heat Treatment Atmosphere on the Crystallization Behavior of SiBON Ceramic Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(9): 3114-3121.

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