Thermal damage and ablation behavior of plasma sprayed Ba_(2)SmTaO_(6) coatings irradiated by high power continuous laser  

作　　者：Jiayi Zheng Zhuang Ma Yanbo Liu Lihong Gao Alexandr A.Rogachev 

机构地区：[1]School of Materials Science and Engineering,Beijing Institute of Technology,No.5 Yard Zhongguancun South Street Haidian District,Beijing,100081,China [2]National Key Laboratory of Science and Technology on Materials Under Shock and Impact,No.5 Yard Zhongguancun Soudi Street Haidian District Beijing,100081,China [3]Francisk Skorina Gomel State University,104 Sovetskaya Str.,Gomel,Belarus,246019

出　　处：《Progress in Natural Science:Materials International》2021年第4期609-617,共9页自然科学进展·国际材料（英文版）

基　　金：supported by the National Natural Science Foundation of China(52073029);China National Key Laboratory Foundation of Science and Technology on Materials under Shock and Impact(6142902200301)。

摘　　要：Ba_(2)SmTaO_(6) laser protection coatings of≈200μm thickness were deposited onto stainless steel surfaces by air plasma spraying,and the laser irradiation resistance of the coatings was investigated.For laser irradiation with a laser power density less than 1000 W/cm^(2),the coatings kept intact.For a laser power density exceeding 1500 W/cm^(2),the Ba_(2)SmTaO_(6) coatings underwent recrystallization,grain growth occurred,and certain spray morphology features disappeared by melting.In the case of a laser power density of 2000 W/cm^(2) applied for 10 s,the incident laser parameter was beyond the coatings protection threshold,and the coating peeled off.The samples back surface temperature kept unchanged within the first 1s of laser irradiation,indicating thatBa_(2)SmTaO_(6) coatings have excellent laser protection capability and can limit the rise of the substrate temperature.However,the low thermal conductivity of Ba_(2)SmTaO_(6) leads to a detrimental laser energy concentration at the beginning of the laser irradiation period on the sample front surface,resulting in a rapid increase of the surface temperature up to the melting point.

关 键 词：Irradiation behavior Continuous laser Plasma spray Thermal barrier coating 

分 类 号：TG174.4[金属学及工艺—金属表面处理]