Microstructural regulation,oxidation resistance,and mechanical properties of C_(f)/SiC/SiHfBOC composites prepared by chemical vapor infiltration with precursor infiltration pyrolysis  

作　　者：Yang LYU Baihe DU Guiqing CHEN Guangdong ZHAO Yuan CHENG Shanbao ZHOU Qingrong LV Xinghong ZHANG Wenbo HAN 

机构地区：[1]National Key Laboratory of Science and Technology on Advanced Composites in Special Environments,and Center for Composite Materials and Structures,Harbin Institute of Technology,Harbin 150080,China [2]School of Chemistry and Materials Science,Heilongjiang University,Harbin 150080,China [3]School of Physics and Material Science,Anhui University,Hefei 230601,China

出　　处：《Journal of Advanced Ceramics》2022年第1期120-135,共16页先进陶瓷（英文）

基　　金：supported by the Key Program of the National Natural Science Foundation of China(No.52032003);the National Natural Science Foundation of China(Nos.519720820 and 51772061);the Science Foundation of the National Key Laboratory of Science and Technology on Advanced Composites in Special Environments(No.6142905202112);the Heilongjiang Provincial Postdoctoral Science Foundation(No.LBH-Z20144).

摘　　要：To further improve the oxidation resistance of polymer derived ceramic(PDC)composites in harsh environments,Cf/SiC/SiHfBOC composites were prepared by chemical vapor infiltration(CVI)and precursor impregnation pyrolysis(PIP)methods.The weight retention change,mechanical properties,and microstructure of C/SiC/SiHfBOC before and after oxidation in air were studied in details.Microscopic analyses showed that only the interface between the ceramics and fibers was oxidized to some extent,and hafnium had been enriched on the composite surface after oxidizing at different temperature.The main oxidation products of Cf/SiC/SiHfBOC composites were Hf0_(2)and HfSi04 after oxidation at 1500℃for 60 min.Moreover,the weight retention ratio and compressive strength of the Cf/SiC/SiHfBOC composites are 83.97%and 23.88±3.11 MPa,respectively.It indicates that the Cf/SiC/SiHfBOC composites should be promising to be used for a short time in the oxidation environment at 1500℃.

关 键 词：Cf/SiC/SiHfBOC composites precursor infiltration pyrolysis(PIP)method mechanical properties high-temperature oxidation resistance 

分 类 号：TB332[一般工业技术—材料科学与工程] V414.8[航空宇航科学与技术—航空宇航推进理论与工程]