Oxidation and Mechanical Properties of SiC/SiC-MoSi2-ZrB2 Coating for Carbon/Carbon Composites
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第2期
论文作者：Xiyuan Yao Hejun Li Yulei Zhang Yongjie Wang
文章页码：123 - 127
摘 要：To improve oxidation resistance of carbon/carbon（C/C） composites,a SiC/SiC-MoSi2-ZrB2 double-layer ceramic coating was prepared on C/C composites by two-step pack cementation.The phase compositions and microstructures of as-prepared multilayer coating were characterized by X-ray diffraction and scanning electron microscopy.The oxidation resistance at 1773 K and the effect of thermal shock between 1773 K and room temperature on mechanical performance of coated specimens were investigated.The results show that the SiC/SiC-MoSi2-ZrB2 coating exhibits dense structure and is composed of SiC,Si,MoSi2 and ZrB2·It can protect C/C composites from oxidation at 1773 K for more than 510 h with weight loss of 0.5%.The excellent anti-oxidation performance of the coating is due to the formation of SiO2-ZrSiO4 complex glassy film.The coating can also endure the thermal shocks between 1773 K and room temperature for 20 times with residual flexural strength of 86.1%.
Xiyuan Yao，Hejun Li，Yulei Zhang，Yongjie Wang
State Key Laboratory of Solidification Processing,Northwestern Polytechnical University
摘 要：To improve oxidation resistance of carbon/carbon（C/C） composites,a SiC/SiC-MoSi2-ZrB2 double-layer ceramic coating was prepared on C/C composites by two-step pack cementation.The phase compositions and microstructures of as-prepared multilayer coating were characterized by X-ray diffraction and scanning electron microscopy.The oxidation resistance at 1773 K and the effect of thermal shock between 1773 K and room temperature on mechanical performance of coated specimens were investigated.The results show that the SiC/SiC-MoSi2-ZrB2 coating exhibits dense structure and is composed of SiC,Si,MoSi2 and ZrB2·It can protect C/C composites from oxidation at 1773 K for more than 510 h with weight loss of 0.5%.The excellent anti-oxidation performance of the coating is due to the formation of SiO2-ZrSiO4 complex glassy film.The coating can also endure the thermal shocks between 1773 K and room temperature for 20 times with residual flexural strength of 86.1%.
关键词：
