Subcritical Hydrothermal Removal of Si Impurity in β-SiC Powder

Abstract

Abstract: The β-SiC powder synthesized by the multi-heat source method was selected as the raw material, and the Si impurity in the β-SiC powder were removed by the subcritical hydrothermal method. The phase composition, microstructure and Si impurity content of β-SiC powder were characterized by XRD, SEM, EDS and visible spectrophotometer, and focused on the optimization of subcritical hydrothermal removal process parameters for Si impurity in β-SiC powder. The results show that the Si impurities in β-SiC powder are mainly SiO₂ and free silicon (F·Si), while the F·Si mainly existe in the form of large particles. The increase of reaction concentration, reaction time and reaction temperature have beneficial to improve the removal rate of Si impurities. The best hydrothermal treatment process is as follows: the liquid-solid ratio is 5∶2, the NaOH concentration is 4 mol·L^-1, the best reaction temperature is 180 ℃, and the best reaction time is 4 h. Under this process, the removal rate of SiO₂ in β-SiC powder reaches 100%, and the removal rate of F·Si is 96.4%.

Key words: β-SiC powder, hydrothermal method, alkali treatment, Si impurity, purification

CLC Number:

TQ163

WANG Bo, DUAN Xiaobo, DENG Lirong, LU Shuhe, WANG Xiaogang, BAI Xiao. Subcritical Hydrothermal Removal of Si Impurity in β-SiC Powder[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(2): 591-596.

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