Comparative Study on Properties of Pressureless Sintering α-SiC by Different Sintering Aids

Abstract

Abstract: Based on pressureless sintering technology, 6Al₂O₃-4Y₂O₃, 2MgO-2Al₂O₃-5SiO₂, 3Al₂O₃-2SiO₂ and B₄C were used as sintering aids to prepare high density silicon carbide (α-SiC) with low content of sintering aids in this study. The phase, microstructure and mechanical properties of α-SiC prepared by different sintering aids and sintering process were analyzed. The results show that in terms of liquid phase sintering, adding 4.0% (mass fraction) 6Al₂O₃-4Y₂O₃ sintering aid, the α-SiC prepared by sintering at 1 850 ℃ has the best performance, and the density reaches 3.19 g·cm^-3. However, at 1 300 ℃,the bending strength and fracture toughness of α-SiC prepared by this process decrease by 34.9% and 7.4%, respectively. In terms of solid phase sintering, the density of α-SiC prepared by adding 0.3% (mass fraction) B₄C sintering aid at 2 000 ℃ reaches 3.14 g·cm^-3, and it has excellent mechanical properties at room temperature and 1 300 ℃. The microstructure of α-SiC prepared by solid phase sintering and liquid phase sintering is compared and analyzed by DF-TEM. The mechanism of the evolution of bending strength and fracture toughness of α-SiC prepared by adding 6Al₂O₃-4Y₂O₃ and B₄C sintering aids at room temperature and high temperature is preliminarily revealed.

Key words: pressureless sintering α-SiC, solid phase sintering, liquid phase sintering, room temperature mechanical property, high temperature mechanical property

CLC Number:

TF124

LONG Shaojun, LIU Zhe, QIN Yuan, SUN Chao, ZHANG Haiming, HE Yong, ZHENG Jiyun. Comparative Study on Properties of Pressureless Sintering α-SiC by Different Sintering Aids[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(3): 1123-1132.

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