Oxidation Resistance of Al-modified APS 7YSZ Thermal Barrier Coating
XU Shiming1, ZHANG Xiaofeng2, LIU Min1,2, DENG Chunming2, DENG Changguang2, NIU Shaopeng2
1 School of Materials Science and Engineering, Central South University, Changsha 410083 2 National Engineering Laboratory for Modern Materials Surface Engineering Technology & The Key Lab of Guangdong for Modern Surface Engineering Technology, Guangdong Institute of New Materials, Guangzhou 510650
Abstract: The use of TBC (thermal barrier coating) generally consisting of a 7YSZ (ZrO2-7wt%Y2O3) ceramic coating and a metallic bond coating has provided significant improvements in durability and efficiency for gas turbine engines to generate power, where the operation condition has its particularity compared with the TBC used in aircraft propulsion. During the service of industrial gas turbine engine, oxidation of metallic coating in TBC system is one of the most important failure factors leading to premature. Although TGO (thermally grown oxide) formation is inevitable, hindering grown rate of TGO contributes to prolong the operation lifetime of TBC. 7YSZ is a transparent material for oxygen ion diffusion. Thus, preparation of an oxygen ion diffusion barrier on 7YSZ surface is an alterative method for restraining TGO grown. In this investigation, an Al film was deposited on 7YSZ surface. After heat treatment, an α-Al2O3 layer was in situ synthesized on 7YSZ coating surface through the reaction of Al and ZrO2, wherethe formed α-Al2O3 overlay can act as an oxygen ion diffusion barrier. Moreover, the effect of heat treatment pressure on oxidation resistance for Al-modified 7YSZ TBC also had been investigated.
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2019, Vol. 33 
