Ablation behavior of(ZrC/SiC)_(3)alternate coating prepared on sharp leading edge C/C composites by CVD  

作　　者：B.Li H.J.Li X.Y.Yao X.F.Tian Y.J.Jia G.H.Feng 

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi׳an 710072,China

出　　处：《Journal of Materials Science & Technology》2022年第20期129-139,共11页材料科学技术（英文版）

基　　金：the National Natural Science Foundation of China(Nos.51727804,51821091,51872233);Natural Science Basic Research Plan in Shaanxi Province of China(No.2020JQ-175)。

摘　　要：A(ZrC/SiC)_(3)alternate coating was deposited on sharp leading edge(SLE)C/C composites by chemical vapor deposition(CVD).The ablation behavior was examined via oxyacetylene torch with heat flux of 2.38 MW/m^2.The results indicated that the alternate coating exhibited great ablation resistance,providing an effective protection for C/C composites.In initial rapid heating stage,the(ZrC/SiC)_(3) alternate coating can relieve thermal stress,avoiding the peeling of coating and keeping an intact coating structure.In subsequent ablation,the Si C layers in central region were consumed rapidly,leaving layered interspaces.Three stacked ZrO_(2) layers were reserved with the assistance of the release of thermal stress by interspaces,offering a great anti-scouring effect.In transition and border regions,the alternate Si C layers can delay oxygen erosion of inner coating and C/C substrate by the formation of SiO_(2).It is believed that the results would be helpful for the design and application of anti-ablation coatings on SLE C/C composites.

关 键 词：Alternate coating ZrC/SiC Sharp leading edge Chemical vapor deposition C/C composites 

分 类 号：TB332[一般工业技术—材料科学与工程] V25[航空宇航科学与技术—航空宇航制造工程]