摘要
氧化钇部分稳定的氧化锆(YSZ)作为热障涂层材料广泛应用于复杂高温工况,其优异的高温耐久性主要由不可相变介稳四方相(t′)所贡献。然而,目前对t′相可靠服役温度上限的界定较为模糊,主流观点仍停留在1200℃左右。基于此,采用大气等离子体喷涂(APS)工艺制备YSZ陶瓷涂层,经不同时效热处理,针对涂层微结构、相组成、烧结收缩和断裂韧性等变化进行分析研究。结果表明,经24 h@1400℃热处理附加7年室温存放后,陶瓷层未见单斜相;300 h@1400℃和300 h@1600℃热处理涂层中单斜相体积分数分别为3.55%和35.41%,且均未碎裂。300 h@1600℃涂层烧结线性收缩率为0.4%。高温时效热处理同时伴随晶粒生长和孔隙愈合,涂层抗折强度和断裂韧性随之增加,因而认为APS YSZ涂层可在1400℃下长时间(~300 h)服役。
Yttria partially stabilized zirconia(YSZ),a component of thermal barrier coatings,is widely used in complex high temperature conditions.The excellent thermal durability is attributed to non-transformable tetragonal phase(t′).Currently,it is uncertain for the maximum working temperature of t′phase,and the mainstream view is still around 1200℃.Based on this,using atmospheric plasma spray(APS)process,YSZ coatings were fabricated followed by various thermal aging treatment.Evolution of microstructure,phase composition,sintering shrinkage and fracture toughness were investigated.The results show that the coating tested in 24 h@1400℃still maintains m phase free even after 7-year room temperature storage;samples heat treated at 300 h@1400℃and 300 h@1600℃no broken,with m phase volume content of 3.55%and 35.41%,respectively.The average linear shrinkage of 300 h@1600℃heat treated coatings is 0.4%.Grain growth and pore healing occurred during thermal aging treatment,bringing the increase of the bending strength and fracture toughness of coatings.Therefore,APS YSZ coatings can be used at 1400℃for long time(~300 h)service.
作者
杜博宇
杨加胜
陶诗倩
赵华玉
钟兴华
庄寅
盛靖
倪金星
邵芳
陶顺衍
DU Boyu;YANG Jiasheng;TAO Shiqian;ZHAO Huayu;ZHONG Xinghua;ZHUANG Yin;SHENG Jing;NI Jinxing;SHAO Fang;TAO Shunyan(The Key Laboratory of Inorganic Coating Materials CAS,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 201899,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;Laboratory of Micro-Nano Optoelectronic Materials and Devices,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第17期89-95,共7页
Aeronautical Manufacturing Technology
基金
国家科技重大项目(2017-Ⅵ-0010-0082)。
