Realizing the excellent oxidation resistance of an environmental barrier coating through aluminum surface modification  

作　　者：Lin Dong Wen-Qi Yang Lin Chen Guan-Jun Yang Chang-Jiu Li 

机构地区：[1]State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China [2]Xi’an Aerospace Engine Company Limited in China Aerospace Science and Technology Corporation,Xi’an 710065,China

出　　处：《Journal of Advanced Ceramics》2024年第7期976-986,共11页先进陶瓷（英文）

基　　金：supported by the Postdoctoral Innovative Talent Support Program(No.BX2021238);the National Natural Science Foundation of China(Nos.U22A20110 and 52301102).

摘　　要：The lifetime of Si-based environmental barrier coatings(EBCs)is constrained by thermally grown SiO_(2)oxidelayer(SiO_(2)-TGO),which can cause premature cracking and spalling.To address this issue,a new approach for surfacemodification using aluminum is proposed.The oxidation performance was examined in a 50 vol%H_(2)O-50 vol%O_(2)environment at 1350℃for up to 300 h.The results indicate that a dense ytterbium aluminum garnet(YbAG)layer wasformed after modification,decreasing the porosity by 80%.Due to the elimination of fast diffusion channels and the lowoxygen permeability of YbAG,aluminum modification significantly reduced the growth rate of SiO_(2)-TGO by nearly twoorders of magnitude.Consequently,its thickness decreased by more than 70%after 300 h of exposure.A diffusioncontrolled oxidation mechanism indicates that the modified dense surface is equivalent to an initial SiO_(2)layer with a specificthickness,causing a shift in the oxidation time and increasing the oxidation resistance.This research provides valuableinsights for designing Si-based EBC with improved lifetimes.

关 键 词：environmental barrier coating(EBC) OXIDATION MODIFICATION diffusion CRACKING 

分 类 号：TB306[一般工业技术—材料科学与工程]