Theoretical design and experimental verification of high-entropy carbide ablative resistant coating  

作　　者：Lingxiang Guo Shiwei Huang Wei Li Junshuai Lv Jia Sun 

机构地区：[1]Science and Technology on Thermostructural Composite Materials Laboratory,Shaanxi Key Laboratory of Fiber Reinforced Light Composite Materials,Northwestern Polytechnical University,Xi'an,710072,China

出　　处：《Advanced Powder Materials》2024年第5期11-22,共12页先进粉体材料（英文）

基　　金：supported by the National Key R&D Program of China(2022YFB3708600,2021YFA0715802);Aeronautical Science Foundation of China(2022Z055053004);Fund of Key Laboratory of National Defense Science and Technology(WDZC20235250505);National Major Science and Technology Projects of China(J2022-VI-0011-0042).

摘　　要：Composition design of high-entropy carbides is a topic of great scientific interest for the hot-end parts in the aerospace field.A novel theoretical method through an inverse composition design route,i.e.initially ensuring the oxide scale with excellent anti-ablation stability,is proposed to improve the ablation resistance of the highentropy carbide coatings.In this work,the(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))C1-δ(HEC)coatings were prepared by the inverse design concept and verified by the ablation resistance experiment.The linear ablation rate of the HEC coatings is1.45μm/s,only 4.78%of the pristine HfC coatings after the oxyacetylene ablation at 4.18 MW/m2.The HEC possesses higher toughness with a higher Pugh's ratio of 1.55 in comparison with HfC(1.30).The in-situ formed dense(Hf_(0.36)Zr_(0.24)Ti_(0.1)Sc_(0.1)Y_(0.1)La_(0.1))O2-δoxide scale during ablation benefits to improve the anti-ablation performance attributed to its high structural adaptability with a lattice constant change not exceeding 0.19%at 2000-2300℃.The current investigation demonstrates the effectiveness of the inverse theoretical design,providing a novel optimization approach for ablation protection of high-entropy carbide coatings.

关 键 词：High-entropy ceramic Theoretical design Thermal spray coating Ablation resistance First-principles calculation 

分 类 号：TG1[金属学及工艺—金属学]