Thermo-physical properties of rare-earth hexaaluminates LnMgAl(11)O(19) (Ln: La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite for advanced thermal barrier coatings
Thermo-physical properties of rare-earth hexaaluminates LnMgAl(11)O(19) (Ln: La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite for advanced thermal barrier coatings
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用于高级热障涂层的稀土六铝酸盐 LnMgAl(11)O(19)（Ln：La、Pr、Nd、Sm、Eu 和 Gd）磁铅石的热物理性质
DOI：
10.1016/j.jeurceramsoc.2014.10.030
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发表时间：
2015
影响因子：
5.7
通讯作者：
Tong Shuyan
中科院分区：
文献类型：
--
作者：
Lu Haoran;Wang Chang-An;Zhang Chenguang;Tong Shuyan
具有LnMgAl 11 O 19型磁铅石结构的化合物由于其优异的热物理性能和相对较低的烧结性而被认为是钇部分稳定氧化锆（YSZ）作为镍基合金热障涂层材料的一类有前途的竞争者。为了更好地理解LnMgAl 11 O 19的结构/性能关系，（Ln = La，Pr，Nd，Sm，Eu，Gd）磁铅石，通过拉曼光谱和X射线衍射（XRD）分析，研究了组分渐变对热物理性能的直接影响。低热导率的来源是Ln离子质量的应变场涨落和AlO 6八面体畸变共同作用的结果LnMgAl_（11）O_（19）复杂晶胞和高密度晶界的本征散射以及与RE ~（3+）离子的相互作用影响。
Compounds with LnMgAl11O19-type magnetoplumbite structure have been identified as a class of promising competitors to established yttria partially stabilized zirconia (YSZ) as a thermal barrier coating materials on nickel-base alloys due to their excellent thermo-physical properties and relatively low sinterability. In order to achieve better understanding of the structure/property relationships of LnMgAl11O19(Ln = La, Pr, Nd, Sm, Eu and Gd) magnetoplumbite, the direct influence of gradual variations of constituent upon therma-physical properties was conducted by analyzing the Raman spectrum and X-ray diffraction (XRD) as well as the calculated phonon mean free path. The source of low thermal conductivities was collectively contributed by the strain field fluctuation of the Ln ionic mass and distorted AlO6octahedron influenced by the interaction with RE3+ions as well as the intrinsic scattering in the complex crystal cell of LnMgAl11O19and the highly dense grain boundaries.