Nb-and Ta-doped(Hf,Zr,Ti)C multicomponent carbides with enhanced oxidation resistance at 2500℃

作     者：Shiyan Chen Jinming Wang Zhaoke Chen Weilong Song Yi Zeng Xingchao Li Tongqi Li Xiang Xiong 

作者机构：State Key Laboratory of Powder MetallurgyCentral South UniversityChangsha 410083China Aerospace Research Institute of Materials&Processing TechnologyChina Academy of Launch Vehicle TechnologyBeijing 100076China 

出 版 物：《Journal of Advanced Ceramics》 (先进陶瓷（英文）)

年 卷 期：2024年第13卷第3期

页      面：332-344页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：This work was supported by the National Natural Science Foundation of China(No.52072410) 

主　　题：(Hf,Zr,Ti)C oxidation behaviour ultra-high-temperature oxidation Nb and Ta doping oxycarbides 

摘      要：Enhancing oxidation resistance of multicomponent carbides above 2000℃is critical for their thermal protection *** this purpose,novel Nb-and Ta-doped(Hf,Zr,Ti)C multicomponent carbides were designed to improve their oxidation resistance at 2500℃.The results demonstrated that Nb and Ta doping reduced the oxidation rate constant by 16.67%and 25.17%,respectively,thereby significantly improving the oxidation resistance of(Hf,Zr,Ti)*** enhancement was attributed to the changes in oxycarbide composition and distribution within the oxide layer by adding Nb and *** to the different oxidation tendencies of the constituent elements,a distinctive structure was formed in which(Hf,Zr)O_(2)served as a skeleton,and various oxycarbides were dispersed throughout the oxide *** doped Nb and Ta were retained within oxycarbides,retarding the diffusion of oxygen into the *** importantly,the addition of Nb and Ta reduced the size of oxycarbides,decreasing both size and quantity of the pores in the oxide layer and facilitating the formation of a more effective oxygen barrier.