不同烧结助剂无压烧结α-SiC的性能对比研究

摘要/Abstract

摘要： 基于无压烧结技术,本文以6Al₂O₃-4Y₂O₃、2MgO-2Al₂O₃-5SiO₂、3Al₂O₃-2SiO₂和B₄C为烧结助剂,开展了低掺量烧结助剂制备高密度碳化硅(α-SiC)的研究,对不同种类烧结助剂及烧结工艺制备的α-SiC的物相、显微组织、力学性能进行分析。结果表明,在液相烧结方面,添加4.0%(质量分数)的6Al₂O₃-4Y₂O₃烧结助剂,经1 850 ℃烧结制备的α-SiC性能最优,密度达到3.19 g·cm^-3,但该工艺制备的α-SiC在1 300 ℃时,弯曲强度及断裂韧性分别衰减34.9%和7.4%。在固相烧结方面,添加0.3%(质量分数)的B₄C烧结助剂,经2 000 ℃烧结制备的α-SiC密度达到3.14 g·cm^-3,在室温及1 300 ℃时均具有优异的力学性能。结合DF-TEM对比分析了固相烧结及液相烧结制备的α-SiC显微组织,初步揭示了添加6Al₂O₃-4Y₂O₃、B₄C烧结助剂制备的α-SiC在室温及高温下的弯曲强度及断裂韧性演变的机理。

关键词: 无压烧结α-SiC, 固相烧结, 液相烧结, 室温力学性能, 高温力学性能

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

中图分类号:

TF124

龙绍军, 刘喆, 秦媛, 孙超, 张海明, 何勇, 郑继云. 不同烧结助剂无压烧结α-SiC的性能对比研究[J]. 硅酸盐通报, 2025, 44(3): 1123-1132.

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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