Effects of air plasma flame on the ZrB_(2)-based UHTC coatings:Microstructure,phase evolution and ablation resistance  

作　　者：Dou Hu Qiangang Fu Lei Zhou Xiaoxuan Li Bing Liu 

机构地区：[1]State Key Laboratory of Solidification Processing,Shaanxi Key Laboratory of Fiber Reinforced Light-Weight Composites,Northwestern Polytechnical University,Xi’an 710072,China

出　　处：《Journal of Materials Science & Technology》2023年第27期194-206,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.2021YFA0715800);the Science Center for Gas Turbine Project(No.P2021-A-IV-003-001);the National Nat-ural Science Foundation of China(No.52125203);the Innova-tion Foundation for Doctor Dissertation of Northwestern Polytech-nical University(No.CX2021007)。

摘　　要：As for the air plasma sprayed ZrB_(2)-based coatings,B content change caused by inevitable oxidation is predictable but commonly ignored.Affected by air plasma flame,the B element loss and residual B_(2) O_(3) in the sprayed ZrB_(2) coating were observed.Moreover,how the B content change affects the microstructure,phase evolution,and ablation resistance(2.4 MW/m^(2),60 s)of ZrB_(2)-based coatings with different sec-ondary phases(SiC,MoSi_(2),and TaC)was investigated.The B element loss contributed to the increase in surface temperature and the decline in the sintering degree of the ZrO_(2) layer.The evaporation of residual B_(2)O_(3) caused damage to the coating structure in the form of pores,whose negative effect was enhanced and reduced by MoSi_(2) and TaC secondary phases,respectively.This work will provide some insight into thermally sprayed non-oxide ceramic coatings in the atmosphere.

关 键 词：Plasma spraying UHTCs Ablation behavior MICROSTRUCTURE ZrB_(2) 

分 类 号：TG174.4[金属学及工艺—金属表面处理]