Solid dust induced roughening and overheating of TBC-coated superalloy  

作　　者：Jia-Qi Han Mei-Jun Liu Javad Mostaghimi Guan-Jun Yang 

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]Department of Mechanical and Industrial Engineering,University of Toronto,Toronto,ON M5S 3G8,Canada

出　　处：《Journal of Materials Science & Technology》2024年第13期69-79,共11页材料科学技术（英文版）

基　　金：National Natural Science Foundation of China(No.51901175);China Postdoctoral Science Foundation Grant(Nos.2020T130499 and 2019M653602);HPC platform in Xi'an Jiaotong University.

摘　　要：Thermal barrier coatings(TBC)on superalloy blade/vane enable an increase in turbine inlet temperature(TIT)and aero-engine efficiency.However,the deposition of dust on TBC significantly ablates superalloys and becomes a bottleneck for advanced engine development.This paper presents a comprehensive mod-eling approach,based on an experiment involving dust deposition on a TBC-coated substrate,aimed at understanding the fundamental cause of substrate ablation.The results show that a significant increase in surface roughness is obtained experimentally with dust accumulation.The temperature field within the TBC-substrate system is disturbed by surface roughening.Consequently,the film cooling is seriously destroyed.While the dust accumulated on the TBC surface also contributes to heat insulation by increas-ing the effective TBC thickness,localized overheating of the substrate occurs and then leads to ablation and premature failure of the substrate.This elucidation of the overheating mechanism could inform the development of strategies to resist dust accumulation in advanced aero engines.

关 键 词：Thermal barrier coating SUPERALLOY DUST ROUGHNESS OVERHEATING 

分 类 号：TG132.3[一般工业技术—材料科学与工程]