论文标题
晶界和缺陷辅助纳米晶体GD2TI2O7 pyrochlore的导热率
Grain boundary and defects assisted thermal conductivity of nano-crystalline Gd2Ti2O7 Pyrochlore
论文作者
论文摘要
对Pyrochlore结构化陶瓷的热导率研究对于利用这些材料作为惰性基质燃料，氧化物燃料电池的电解质和热屏障涂层很重要。已经研究了孔隙率，结构缺陷和边界散射对由火花等离子体烧结制造的纳米晶体GD2TI2O7的热性能的影响，然后研究了高能球铣削。使用激光闪光灯（LFA）在温度范围内测量了热导率，并通过包括几种有助于NC-Pyrochlore的热传播来支持散射机制来讨论结果。可以通过声子孔散射现象来理解导热率的系统降低。此外，还观察到随着温度升高的热传输，边界散射的支配。导热率的实验确定的值与热屏障涂层（TBC）应用的热绝缘要求兼容
The thermal conductivity study on the pyrochlore structured ceramics is important for utilization of these materials as an inert matrix fuel, electrolytes for oxide fuel cell and thermal barrier coating. The impact of porosity, structural defects and boundary scattering on thermal properties of the nanocrystalline Gd2Ti2O7 fabricated by spark plasma sintering followed by high energy ball milling has been investigated. The thermal conductivity has been measured in the temperature range from room temperature to 900 C using laser flash apparatus (LFA), and results were discussed by including several phenomena contributing to the thermal transmission in nc-pyrochlore in support of the scattering mechanism. A systematic decrease in thermal conductivity with reducing grain size can be understood by the phonon-pore scattering phenomenon. Furthermore, dominate of the boundary scattering on the thermal transmission with the increasing temperature is also observed. The experimentally determined values of thermal conductivity are compatible with the thermal insulation requirements for thermal barrier coating (TBC) applications
