TiAl合金表面TiAlCrY/YSZ涂层高温长时间服役性能  

High Temperature Long-term Service Performance of TiAlCrY/YSZ Coating on TiAl Alloy

作　　者：潘洋洋 梁波 洪督 祁志祥[3] 牛亚然[2] 郑学斌[2] PAN Yangyang;LIANG Bo;HONG Du;QI Zhixiang;NIU Yaran;ZHENG Xuebin(State Key Laboratory of Metastable Materials Science and Technology,College of Materials Science and Engineering,Yanshan University,Qinhuangdao 066004,China;Key Laboratory of Inorganic Coating Materials CAS,Shanghai Institute of Ceramics,Chinese Academy of Sciences,Shanghai 200050,China;MIIT Key Laboratory of Advanced Metallic and Intermetallic Materials Technology,Engineering Research Center of Materials Behavior and Design,Ministry of Education,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]燕山大学材料科学与工程学院,亚稳材料国家重点实验室,秦皇岛066004 [2]中国科学院上海硅酸盐研究所,特种无机涂层实验室,上海200050 [3]南京理工大学材料评价与设计教育部工程研究中心,先进金属与金属间化合物材料技术工信部重点实验室,南京210094

出　　处：《无机材料学报》2023年第1期105-112,共8页Journal of Inorganic Materials

基　　金：中国科学院国防科技创新基金项目(CXJJ-21S029)。

摘　　要：TiAl合金具有低密度、高比强度的优异性能,是一种潜在的航空发动机用结构材料。TiAl合金的服役温度范围为700~900℃,在其表面制备高温热防护涂层可以进一步提高服役温度。本研究采用等离子喷涂技术在TiAl合金表面制备了新型TiAlCrY/YSZ涂层,并与传统的NiCrAlY/YSZ热障涂层进行高温长时间服役性能对比研究。结果发现,TiAlCrY/YSZ涂层在1100℃空气环境中服役300 h保持完好,表现出良好的高温性能,而NiCrAlY/YSZ涂层在1100℃的服役寿命不足100 h。显微分析结果表明,TiAlCrY黏结层表面会形成一层连续且致密的TGO,其主要成分为Al2O3,与YSZ涂层的界面兼容性良好。并且TGO在1100℃空气环境中服役300 h后,厚度仍<8μm。以上研究表明,与传统NiCrAlY/YSZ热障涂层相比,TiAlCrY/YSZ更适合作为TiAl合金表面的高温热防护涂层。TiAl alloy has excellent properties of low density and high specific strength,which is a potential structural material for aero-engine.The service temperature of TiAl alloy is limited in the range of 700–900℃,which is further improved by preparation of high temperature thermal protection coating.In the present work,a new type of TiAlCrY/YSZ coating was prepared on the TiAl alloy by plasma spray technologies,of which long-term service performance at high temperature was compared with the traditional NiCrAlY/YSZ coating.It was found that the TiAlCrY/YSZ coating remained intact after served 300 h at 1100℃in the air,showing excellent high temperature performance,while the service lifetime of the NiCrAlY/YSZ coating at 1100℃was less than 100 h.The microstructure observation found that a continuous and dense TGO composed of Al2O3 was continuously formed on the TiAlCrY bonding coating,suggesting that TiAlCrY coating has good interfacial compatibility with the YSZ top coating.Moreover,the thickness of TGO was still less than 8μm after served 300 h at 1100℃in the air.As compared with traditional NiCrAlY/YSZ coating,the TiAlCrY/YSZ coating is a more suitable high temperature thermal coating ever for TiAl alloys.

关 键 词：TIAL合金 TiAlCrY/YSZ涂层 等离子喷涂 高温长时间服役性能 

分 类 号：TQ174[化学工程—陶瓷工业]