Ablation resistance of ZrC coating modified by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature  

作　　者：Xuemeng Zhang Yuyu Zhang Lingxiang Guo Bing Liu Yuqi Wang Hongbin Li Hejun Li Jia Sun 

机构地区：[1]Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [2]China Aerodynamics Research and Development Center,Mianyang 621000,China [3]Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,National University of Defense Technology,Changsha 410073,China

出　　处：《Journal of Materials Science & Technology》2024年第15期119-131,共13页材料科学技术（英文版）

基　　金：supported by the National Key R&D Program of China(No.N2022YFB3708600);the National Natural Science Foundation of China(Nos.52101098 and 52061135102);the Fund of Key Laboratory of National Defense Science and Technol-ogy(No.WDZC20235250505);The authors also thank the Analyti-cal&Testing Center of Northwestern Polytechnical University(No.2022T019)for the characterization.

摘　　要：Polymer-derived ceramics(PDCs)method opens up new possibilities for the preparation of novel multi-phase ceramic nanocomposites owing to the molecular design of the precursors at the nanoscale level.In the current work,ZrC coatings incorporated with polymer-derived ceramic microspheres(CMS),SiH-fOC_CMS,were deposited to enhance the ablation resistance by supersonic atmosphere plasma spraying.Upon 10.0 MW·m^(-2) plasma ablation at above 3000℃,the linear ablation rate of ZrC-SiHfOC_CMS coat-ing was reduced to 0.20μm·s^(-1),62%lower than that of the pristine ZrC coating.The improvement was ascribed to the presentence of viscous SiO_(2)/HfO_(2) molten mixed phase,rather than HfSiO4,which can ef-fectively seal pinholes and cracks.Moreover,the in-situ generated crystalline SiO_(2) had a lower oxygen diffusion rate than amorphous SiO_(2),meanwhile,m-HfO_(2) could improve the stability of SiO_(2) glassy film,thus further enhancing the ablation resistance.

关 键 词：ZRC Polymer-derived ceramics(PDCs) Carbon/Carbon composites Plasma spraying Plasma ablation 

分 类 号：TB332[一般工业技术—材料科学与工程] TQ174.1[化学工程—陶瓷工业]