烧结助剂对反应烧结SiC陶瓷结构及性能作用机制研究

doi:10.16552/j.cnki.issn1001-1625.2024.1520

摘要/Abstract

摘要： 反应烧结是制备SiC陶瓷的一种常用工艺,所制备的SiC陶瓷不仅性能优越、烧结温度较低,而且样品的形状和尺寸不受限制,具有广泛的应用前景。但是,反应烧结碳化硅残留了较多的单质硅,严重影响了材料的高温性能。本文通过添加Al₂O₃-Y₂O₃-SiO₂烧结助剂来降低残留硅含量,使用SEM、EDS、TEM等分析方法研究烧结助剂对反应烧结SiC陶瓷结构和性能的影响。结果表明,烧结助剂能够有效填充晶粒间孔隙,提高材料的性能,当添加1.5%(质量分数)的烧结助剂时,样品的断裂韧性和抗弯强度分别达到了3.28 MPa·m^1/2和135.20 MPa,硬度和热导率也分别升高到18.1 GPa和18.60 W/(m·K)。此外,烧结助剂中存在的氧化铝等物相能够有效提升SiO₂氧化膜的稳定性,降低氧化速率,从而避免膜层开裂,显著提高SiC陶瓷的高温性能。

关键词: SiC, SiO₂, 烧结助剂, 反应烧结, 致密度, 高温稳定性

Abstract: Reaction-sintering is a common process for the preparation of SiC ceramics, and the prepared SiC ceramics not only have superior performance and low sintering temperature, but also the shape and size of sample are not limited, which have a wide range of application prospects. However, The reaction-sintering SiC remains a lot of residual silicon, which seriously affects the high-temperature performance of material. In this study, the addition of Al₂O₃-Y₂O₃-SiO₂ sintering additive was used to reduce the residual silicon content. SEM, EDS, TEM and other analytical methods were used to study the effect of sintering additive on the structure and properties of reaction-sintering SiC ceramics. The results show that the sintering additive can effectively fill the grain boundary pores and improve the material properties. When the addition contnet is 1.5% (mass fraction), the fracture toughness and bending strength of sample reach 3.28 MPa·m^1/2 and 135.20 MPa. At the same time, the hardness and thermal conductivity also increase to 18.1 GPa and 18.60 W/(m·K). In addition, the presence of alumina and other phases in the sintering aids can effectively improve the stability of SiO₂ oxide film and reduce the oxidation rate, thereby avoiding film cracking and significantly improving high-temperature performance of SiC ceramics.

Key words: SiC, SiO₂, sintering additive, reaction-sintering, density, high-temperature stability

中图分类号:

TQ174

刘森, 陈毛, 陈勇强, 王海龙, 张锐, 范冰冰. 烧结助剂对反应烧结SiC陶瓷结构及性能作用机制研究[J]. 硅酸盐通报, 2025, 44(6): 2259-2268.

LIU Sen, CHEN Mao, CHEN Yongqiang, WANG Hailong, ZHANG Rui, FAN Bingbing. Effect Mechanism of Sintering Additives on Structure and Properties of Reaction-Sintering SiC Ceramics[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(6): 2259-2268.

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