等离子喷涂YSZ热障涂层的制备与耐高温性能  

Fabrication and corrosion resistance of plasma sprayed YSZ thermal barrier coatings

作　　者：张晶晶 季玮华 白岩 张昊 何波 王志强 ZHANG Jingjing;JI Weihua;BAI Yan;ZHANG Hao;HE Bo;WANG Zhiqiang(School of Textile and Material Engineering, Dalian Polytechnic University, Dalian 116034, China)

机构地区：[1]大连工业大学纺织与材料工程学院,辽宁大连116034

出　　处：《大连工业大学学报》2020年第5期380-385,共6页Journal of Dalian Polytechnic University

基　　金：辽宁省教育厅科学技术研究项目(2017J039);大连市支持高层次人才创新创业项目(2017RQ056).

摘　　要：采用等离子喷涂技术在镍基高温合金上制备氧化钇稳定氧化锆(YSZ)热障涂层,并对涂层进行了高温氧化腐蚀实验和耐熔融玻璃腐蚀实验。利用X射线衍射仪、扫描电子显微镜/能谱仪、显微硬度计、光学显微镜等对YSZ涂层在高温下耐腐蚀性能进行了研究。结果表明,涂层由亚稳的四方相和立方相组成,孔隙率为25.25%,平均显微硬度为609 Hv0.2。经900℃高温氧化100 h后,YSZ涂层表面相组成无明显变化,组织结构稳定,涂层仍与基体保持良好的结合,说明该涂层具有较强的抗高温氧化能力。经1200℃熔融玻璃腐蚀2 h后,由于热化学反应引起YSZ涂层产生相变,热膨胀系数不匹配导致YSZ涂层内部裂纹扩展,涂层失效。根据腐蚀机理分析,提高YSZ涂层的耐熔融玻璃腐蚀能力可以从改善涂层材料入手,增加能够诱导腐蚀介质析晶的氧化物,从而提高涂层服役寿命。Yttria stabilized zirconia(YSZ)thermal barrier coating was prepared on nickel-based high temperature alloy by atmospheric plasma spraying technology.The mechanism of high temperature oxidation corrosion and CMAS corrosion resistance of the coating was conducted by using X-ray diffraction analysis,scanning electron microscope/energy spectrum analysis,microhardness,and optical measurements.The results showed that the coating was composed of stable tetragonal and cubic phases,with a porosity of 25.25%and an average microhardness of 609 Hv0.2.After high temperature oxidation of 100 h at 900℃,the surface composition of the YSZ coating did not change significantly,the phases were stable,and the coating still well integrated with the substrate,indicating that the coating had strong resistance to high temperature oxidation.After corroded by molten glass for 2 h at 1200℃,the YSZ coating failed in use because of the phase transformation caused by the thermochemical reaction and the expanding of the internal cracks of the YSZ coating due to the mismatch of the thermal expansion coefficient.Based on the corrosion mechanism analysis,to improve the corrosion resistance of YSZ coating on molten glass,the coating material can be improved by increasing the oxides that can induce the crystallization of the corrosion glass,which lays the theoretical foundation for extending the service life of the coating.

关 键 词：热障涂层 高温氧化 熔融玻璃 

分 类 号：TQ129[化学工程—无机化工]