中国物理B ›› 2023, Vol. 32 ›› Issue (6): 68102-068102.doi: 10.1088/1674-1056/ac9a38
Shuai Xu(徐帅)1, Tao Wang(王韬)2,†, Xingang Wang(王新刚)3, Lu Wu(吴璐)4, Zhongqiang Fang(方忠强)4, Fangfang Ge(葛芳芳)5, Xuan Meng(蒙萱)6, Qing Liao(廖庆)7, Jinchun Wei(魏金春)1, and Bingsheng Li(李炳生)7,‡
Shuai Xu(徐帅)1, Tao Wang(王韬)2,†, Xingang Wang(王新刚)3, Lu Wu(吴璐)4, Zhongqiang Fang(方忠强)4, Fangfang Ge(葛芳芳)5, Xuan Meng(蒙萱)6, Qing Liao(廖庆)7, Jinchun Wei(魏金春)1, and Bingsheng Li(李炳生)7,‡
摘要: Ti$_{0.2}$Zr$_{0.2}$Hf$_{0.2}$Nb$_{0.2}$Ta$_{0.2}$C-$M_{x}$C composite ceramic was prepared by hot press sintering, with the Ti$_{0.2}$Zr$_{0.2}$Hf$_{0.2}$Nb$_{0.2}$Ta$_{0.2}$C high-entropy carbide as the main phase. Secondary phase $M_{x}$C ($M={\rm Ti}$, Zr, Hf, Nb, Ta) was found to be distributed relatively uniform in the composite ceramic. The oxidation behavior of the ceramic was examined after exposure to 923 K and 1173 K. Morphology of the surface and cross sections of all oxidation samples were observed. The characteristics of the oxidation behavior of the high-entropy carbide and the secondary phase $M_{x}$C were compared and analyzed. The secondary phases (such as Ti-rich carbide or Hf-rich carbide) in the material were seriously oxidized at 923 K and 1173 K, which reflects the superior oxidation performance of the high-entropy carbide. The nano high-entropy oxides with Ti, Zr, Hf, Nb, Ta, and O elements were discovered by oxidation of the composite ceramic. This research will help deepen the understanding of the oxidation mechanism of high-entropy carbide and composite ceramic.
中图分类号: (Cermets, ceramic and refractory composites)