Sm2Y1-xAlxTaO7陶瓷材料的热物理性能
Thermophysical Properties of Sm2Y1-xAlxTaO7 Ceramics
刘保福 1朱金矿1
作者信息
- 1. 平顶山工业职业技术学院,资源开发学院,平顶山 467000
- 折叠
摘要
以高纯度Al2O3、Y2O3、Sm2O3和Ta2O5为原材料,采用高温烧结方法制备了 Sm2Y1-xAlxTaO7系列陶瓷材料,对其晶体结构、显微组织、元素组成、热导率和热膨胀性能进行了系统研究.结果表明,除Sm2Y0.5Al0.5TaO7具有焦绿石结构之外,其余三种氧化物均具有单一的萤石晶体结构.其块体材料相对致密度均在90％以上,晶界清晰,各元素摩尔比与其化学式基本一致.由于Al3+和Y3+之间较大的离子半径和原子量差别,增大了对声子的散射,其热传导性能随着Al2O3含量的增加而降低.虽然Al2O3含量增加降低了其热膨胀系数,其大小与YSZ基本相当,所制备陶瓷在室温至1400 ℃范围内具有良好的相稳定性能.
Abstract
The high-purity Al2O3,Y2O3,Sm2O3 and Ta2O5 were utilized as raw materials to prepare the Sm2Y1-xAlxTaO7 series ceramic materials through a high-temperature sintering method.Their crystal structure,microstructure,elemental composition,thermal conductivity,and thermal expansion properties were systematically studied.The results indicate that except for Sm2Y0.5Al0.5TaO7,which has a pyrochlore structure,the other three oxides exhibit a single fluorite crystal structure.The relative density of the obtained dense samples exceeded 90％,displaying clear grain boundaries,and the molar ratios of elements were consistent with their chemistry formulas.Because of the large disparities in ionic radius and atomic weight between Al3+and Y3+,phonon scattering is amplified;nevertheless,as the Al2O3 concentration increases,the thermal conductivity of Sm2Y1-xAlxTaO7 falls.Although an increase in Al2O3 concentration reduces the thermal expansion coefficient,the value remains equivalent to YSZ.Additionally,the prepared ceramics exhibit excellent phase stability at the temperature range from room temperature to 1400 ℃.
关键词
高温热防护涂层/稀土钽氧化物/热导率/热膨胀系数Key words
High-temperature thermal-protection coating/Rare-earth tantalum oxide/Thermal conductivity/Thermal expansion coefficient引用本文复制引用
出版年
2024
NETL
NSTL
万方数据