GdTaO_4陶瓷的制备、力学性质和热导率研究
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摘要
为寻找性能更为优异的陶瓷热障涂层材料,采用固相反应法合成了单斜结构的GdTaO_4陶瓷材料,分析了其微观组织形貌。第一性原理计算结果表明其沿[100]晶向的杨氏模量值约为[010]和[001]方向上的3倍。实验测得800℃下其热导率约为1.70 W·m~(-1)·K~(-1),明显低于7YSZ和8YSZ在800℃下的热导率(分别约为2.37和2.47 W·m~(-1)·K~(-1)),是一种潜在的低热导陶瓷热障涂层材料。
In order to search the more excellent thermal barrier coating materials, the monoclinic GdTaO_4 ceramics were synthesized by solid-phase reaction. The microstructure was analyzed. The results of first-principles calculations indicate that the Young's modulus along[100] crystallographic orientation is triple as large as that along [010] and [001] crystallographic orientation. The measured thermal conductivity is 1.70 W·m~(-1)·K~(-1) at 800 ℃ in experiment, which is lower than the thermal conductivities of 7 YSZ and 8 YSZ(2.37 and 2.47 W·m~(-1)·K~(-1)). The GdTaO_4 is a promising thermal barrier coating material.
In order to search the more excellent thermal barrier coating materials, the monoclinic GdTaO_4 ceramics were synthesized by solid-phase reaction. The microstructure was analyzed. The results of first-principles calculations indicate that the Young's modulus along[100] crystallographic orientation is triple as large as that along [010] and [001] crystallographic orientation. The measured thermal conductivity is 1.70 W·m~(-1)·K~(-1) at 800 ℃ in experiment, which is lower than the thermal conductivities of 7 YSZ and 8 YSZ(2.37 and 2.47 W·m~(-1)·K~(-1)). The GdTaO_4 is a promising thermal barrier coating material.
引文
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[3]Wang J,Chong X Y,Zhou R et al.Scripta Mater[J],2017,126:24
[4]Wang J,Chong X Y,Zhou R et al.Ceram Int[J],2016,42(12):13 876
[5]Swalin R A.Thermodynamics of Solids[M].New York:Wiley,1972
[6]Perdew J P,Burke K,Ernzerhof M.Phys Rev Lett[J],1996,77(18):3865
[7]Chong X Y,Jiang Y H,Zhou R et al.Comp Mater Sci[J],2015,108:205
[8]Tian Z L,Zheng L Y,Li Z J et al.J Eur Ceram Soc[J],2016,36(11):2813
[9]Feng J,Ren X R,Wang X Y et al.Scripta Mater[J],2012,66(1):41
[10]Zhao M,Ren X R,Yang J et al.Ceram Int[J],2016,42(1):501
[11]Wan C L,Zhang W,Wang Y F et al.Acta Mater[J],2010,58(18):6166
[12]Wan C L,Qu Z X,He Y et al.Phys Rev Lett[J],2008,101(8):085 901
[13]Zhou Y C,Xiang H M,Lu X P et al.J Adv Ceram[J],2015,4(2):83