首页|Ablation resistance of ZrC coating modified-by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature
Ablation resistance of ZrC coating modified-by polymer-derived SiHfOC ceramic microspheres at ultrahigh temperature
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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 0.20 μm·s-1,62％lower than that of the pristine ZrC coating.The improvement was ascribed to the presentence of viscous SiO2/HfO2 molten mixed phase,rather than HfSiO4,which can ef-fectively seal pinholes and cracks.Moreover,the in-situ generated crystalline SiO2 had a lower oxygen diffusion rate than amorphous SiO2,meanwhile,m-HfO2 could improve the stability of SiO2 glassy film,thus further enhancing the ablation resistance.
Xuemeng Zhang、Yuyu Zhang、Lingxiang Guo、Bing Liu、Yuqi Wang、Hongbin Li、Hejun Li、Jia Sun
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Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China
China Aerodynamics Research and Development Center,Mianyang 621000,China
Science and Technology on Advanced Ceramic Fibers and Composites Laboratory,National University of Defense Technology,Changsha 410073,China
国家重点研发计划国家自然科学基金国家自然科学基金Fund of Key Laboratory of National Defense Science and TechnologyAnalytical & Testing Center of Northwestern Polytechnical University
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