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投稿时间:2024-06-17 修订日期:2024-08-31
投稿时间:2024-06-17 修订日期:2024-08-31
中文摘要: 稀土钽酸盐RE3TaO7和铌酸盐RE3NbO7(RE代表稀土元素)具有高热膨胀系数、低热导率和优异的高温稳定性等特点,被广泛作为热障涂层材料进行研究。研究了(SmEuGd)(Ta0.5Nb0.5)O7高熵陶瓷的硬度、断裂韧性、热膨胀系数和热导率等关键力-热学性质,通过高熵效应实现对其性能的优化。结果显示,相较于单稀土RE3TaO7和RE3NbO7陶瓷,(SmEuGd)(Ta0.5Nb0.5)O7高熵陶瓷的硬度、弹性模量和高热膨胀系数进一步提高,同时热导率进一步降低,并且其热导率随温度的变化出现类玻璃态特征。相较于传统的氧化钇稳定氧化锆陶瓷,(SmEuGd)(Ta0.5Nb0.5)O7高熵陶瓷具有高工作温度(达到1 500 ℃)、低热导率(1.78 W·m-1·K-1, 900 ℃)和高热膨胀系数(10.87×10-6 K-1, 1 500 ℃)的优势。高熵陶瓷的设计和制备可以进一步优化RE3TaO7和RE3NbO7材料的力热学性质。
Abstract:Rare-earth tantalats RE3TaO7 and niobates RE3NbO7 (RE=rare-earth) have characteristics of high thermal expansion coefficients (TECs), low thermal conductivity, and excellent high-temperature stability, subsequently, they are widely studied as thermal barrier coatings. The key force-thermal properties such as hardness, fracture toughness, thermal expansion coefficient and thermal conductivity of (SmEuGd)(Ta0.5Nb0.5)O7 ceramics were studied, and their properties were optimized by high entropy effect. The results show that compared with single-rare-earth RE3TaO7 and RE3NbO7 ceramics, (SmEuGd)(Ta0.5Nb0.5)O7 exhibits higher TECs, hardness and modulus, when its thermal conductivity is further reduced, and displays amorphous behavior. Compared with traditional ytrria-stablized zirconia (YSZ), (SmEuGd)(Ta0.5Nb0.5)O7 has higher working temperatures (1 500 °C), lower thermal conductivity (1.78 W·m-1·K-1, 900 °C), and higher TECs (10.87×10-6 K-1, 1 500 °C). It is proved that the thermal and mechanical properties of RE3TaO7 and RE3NbO7 can be further optimized via high-entropy engineering.
keywords: thermal barrier coatings rare-earth tantalates high-entropy ceramics thermal conductivity mechanical properties
文章编号: 中图分类号:TG174.4 文献标志码:
基金项目:无
引用文本:
刘若愚,薛桂宇,陈琳,李克,张陆洋,王建坤,吕亮,王乐,殷倩楠,冯晶.热障涂层材料(SmEuGd)(Ta0.5Nb0.5)O7高熵陶瓷的力-热学性质研究[J].热喷涂技术,2024,16(3):28-35.
LIU Ruoyu,XUE Guiyu,CHEN Lin,LI Ke,ZHANG Luyang,WANG Jiankun,LV Liang,WANG Le,YIN Qiannan,FENG Jing.Mechanical and Thermal Properties of High-entropy Ceramics (SmEuGd)(Ta0.5Nb0.5)O7 as Thermal Barrier Coatings[J].Thermal Spray Technology,202416(3):28-35.
刘若愚,薛桂宇,陈琳,李克,张陆洋,王建坤,吕亮,王乐,殷倩楠,冯晶.热障涂层材料(SmEuGd)(Ta0.5Nb0.5)O7高熵陶瓷的力-热学性质研究[J].热喷涂技术,2024,16(3):28-35.
LIU Ruoyu,XUE Guiyu,CHEN Lin,LI Ke,ZHANG Luyang,WANG Jiankun,LV Liang,WANG Le,YIN Qiannan,FENG Jing.Mechanical and Thermal Properties of High-entropy Ceramics (SmEuGd)(Ta0.5Nb0.5)O7 as Thermal Barrier Coatings[J].Thermal Spray Technology,202416(3):28-35.