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Evaluation of Hot Corrosion Behavior of Laser As-remelted YSZ Thermal Barrier Coatings at 950 ℃ |
Lijia YU,Wenping LIANG(),Hao LIN,Qiang MIAO,Biaozi HUANG,Shiyu CUI |
1. College of Materials Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211100, China |
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Abstract The thermal barrier coating (TBC) of ZrO2-7%Y2O3 (mass fraction) was firstly prepared on high temperature alloy GH4169 and then remelted via CO2 laser glazing technique. The hot corrosion behavior of the ordinary and the laser as-remelted TBCs are assessed in 75%Na2SO4+25%NaCl (mass fraction) molten salt for different time. The morphologies and phase composition of the two TBCs were characterized by means of scanning electron microscope and X-Ray Diffractometer. The results indicated that the ordinary TBC experienced mass gain in the first period of 50 h, hereafter, mass loss in the rest period of test. The total mass loss was about 6.8 mg/cm2 after 100 h test. In the meanwhile spallation of the top surface of the coating did occur and phases of ZrO2 and Y2(SO4)3 could be detected by XRD on the coating surface. The mass gain versus time curve for the laser remelted TBC rose up gradually in the first stage, and then turned to be stable in the later stage. The total mass gain reached about 3.7 mg/cm2 after 100 h test. It is noted that only ZrO2 phase could be detected on the coating surface. It illustrated that the hot corrosion resistance of the TBCs has been further improved by laser remelted technique.
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Received: 08 January 2018
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Fund: Supported by National Natural Science Foundation of China(514741431);Priority Academic Program Development of Jiangsu Higher Education Institutions |
Corresponding Authors:
Wenping LIANG
E-mail: wpliang@nuaa.edu.cn
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