Abstract
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.
基金项目
国家重点研发计划(N2022YFB3708600)
国家自然科学基金(52101098)
国家自然科学基金(52061135102)
Fund of Key Laboratory of National Defense Science and Technology(WDZC20235250505)
Analytical & Testing Center of Northwestern Polytechnical University(2022T019)
NETL
NSTL
万方数据