Microstructure and Thermal Cycling Behavior of the Surface-modified Thermal Barrier Coatings by High-current Pulsed Electron Beam
WU Jian1, GUAN Qingfeng1, CAI Jie2,3, LYU Peng1, ZHANG Conglin1, LI Chen1
1 School of Materials Science and Engineering, Jiangsu University, Zhenjiang 212013; 2 Institute of AdvancedManufacturing and Modern Equipment Technical, Jiangsu University, Zhenjiang 212013; 3 School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013
Abstract: High-current pulsed electron beam (HCPEB) treatment was conducted on thermal barrier coatings (TBCs) prepared by air plasma sprayed (APS) technology. The effects of HCPEB irradiation on the microstructure and thermal cycling behavior of TBCs were investigated. The thermal cycling test was carried out by using a muffle furnace, and each cycle consisted of holding at 950 ℃ in air and cooling by water quenching. The microstructure and phase composition of the coatings before and after HCPEB irradiation were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD).The XRD results revealed that the content of monoclinic (m) phase in the yttria stabilized zirconia (YSZ) topcoat was reduced after HCPEB irradiation. Besides, the width of peaks became wider and peak locations slightly shifted, which indicated the grain refinement and residual stress generation. The remelting of the coating surface, the elimination of thermal sprayed defects, the reduced surface roughness, as well as a conti-nuous micro-crack network perpendicular to the surface and columnar grains in the remelted layer, could be observed by SEM for the HCPEB irradiated YSZ topcoat. Thermal cycling test results confirmed the failure of the initial YSZ coating after 250 cycles, as the overall spalling occurred. Contrastively, no obvious signs of spallation appeared for the irradiated coating, and only the propagation of horizontal cracks can be observed. Our experiment validated the higher thermal cycling resistance of the HCPEB-TBCs.
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2018, Vol. 32 
