Sublayer design and ablation resistance of CVD-TaC alternate coatings with different crystallite morphologies for C/C composites  

作　　者：Jing’an Kong Yulei Zhang Hanhui Wang Guohui Chen Wenhan Gai Pengfei Zhang Hejun Li 

机构地区：[1]State Key Laboratory of Solidification Processing,Carbon/Carbon Composites Research Center,Northwestern Polytechnical University,Xi’an,Shanxi 710072,China

出　　处：《Journal of Materials Science & Technology》2023年第10期1-10,共10页材料科学技术（英文版）

基　　金：supported by the National Natu-ral Science Foundations of China(Nos.51727804,52130205,and 91860203);the National Key R&D Program of China(No.2021YFA0715803);The authors also thank the Analytical&Testing Center of Northwestern Polytechnical University for the characteri-zation of our samples.

摘　　要：Tantalum carbon(TaC)alternate coatings with sublayers comprised of different crystallite morphologies were prepared on carbon/carbon composites by chemical vapor deposition.Their ablative behaviors and defending mechanisms were both investigated.The specimen with the sublayer composed of columnar crystals exhibited a better ablation resistance due to the toughness enhancement induced by the lami-nated structure.However,the mechanical denudation of the sample only containing acicular crystals and the coating spallation caused by superfluous gaseous products of the sample with the sublayer composed of nanocrystals both indicate their inferior anti-ablation properties.It is believed that the results will be helpful for the structural design and practical application of chemical vapor deposition(CVD)alternate coatings.

关 键 词：Alternate coating Chemical vapor deposition Crystallite morphology Carbon/carbon composite Ablation behavior 

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]