B4C 增强 SiC 基复合陶瓷力学性能和抗氧化性能

作者：Chen Jiaxin; Zeng Qihang; Wang Feng; Chen Ping'an^*; Li Xiangcheng^*; Zhu Yingli; Zhu Boquan

来源：Journal of the Chinese Ceramic Society, 2023, 51(3): 730-737.

DOI：10.14062/j.issn.0454-5648.20220648

• boron carbide
• mechanical properties
• oxidation resistance
• silicon carbide-based composite ceramics

The effects of B4C addition and heat treatment temperature on the microstructure, mechanical properties and oxide resistance of SiC-based composite ceramics were investigated. The results show that the addition of B4C can improve the crystallinity and graphitization of SiC. The linear change rate of SiC-based composite ceramics decreases from 1.39% to 0.58%. The flexural strength and compressive strength are increased by 1.8 times and 2 times (i.e., from 28.06 MPa to 50.25 MPa and from 48.03Pa to 98.58 MPa), respectively, after heat treatment at 1 450 ℃ at B4C addition of 6% (in mass fraction). The oxidation index of SiC-based composite ceramics decreases from 30.33% to 18.35% after oxidation at 1 400 ℃, and the thickness of the oxide layer decreases substantially from 3.52 mm to 0.23 mm with the increase of B4C addition from 0 to 6%. Therefore, adding B4C can enhance the amount of SiC whiskers and the strength and oxidation resistance of SiC-based composite ceramics as well. ? 2023 Chinese Ceramic Society.

• 单位
  武汉科技大学