Abstract：The NiCrAlY bond coating was prepared by high velocity oxygen-fuel spray(HVOF) on the surface of directionally solidified DZ40M Co-based superalloy, and nanostructure and segmentation structure 7YSZ top coating were prepared by atmosphere plasma spray(APS) from nano-agglomerated powder. Gas hot-corrosion resistance of DZ40M alloy and alloy with different structure thermal barrier coatings(TBCs) at 900℃ was studied. Corrosion products and corrosion process were analyzed. The results show that DZ40M alloy with TBCs has more excellent gas hot-corrosion resistance than that of the alloy without coating, and avoid many easily detached corrosion products and corrosion voids in DZ40M alloy under gas hot-corrosion process. The coatings with different structure remain intact after gas hot-corrosion, and hot corrosion rate is almost appropinquity of DZ40M alloy with two kinds top coating. The coating with segmentation crack can prolong strain tolerance and thermal cycle life, but the vertical cracks are unable to become a passage for corrosive medium rapid infiltration.
何箐, 屈轶, 汪瑞军, 王伟平. DZ40M合金表面纳米和垂直裂纹结构热障涂层的抗燃气热腐蚀性能[J]. 材料工程, 2014, 0(5): 66-72.
HE Qing, QU Yi, WANG Rui-jun, WANG Wei-ping. Gas Hot-corrosion Resistance of Nanostructure and Segmentation Thermal Barrier Coatings on DZ40M Superalloy. Journal of Materials Engineering, 2014, 0(5): 66-72.
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