Effect of lattice defects on thermal conductivity of Ti-doped, Y2O3-stabilized ZrO2
Effect of lattice defects on thermal conductivity of Ti-doped, Y2O3-stabilized ZrO2
复制标题
DOI：
10.1016/j.actamat.2013.05.038
复制
发表时间：
2013-08
期刊：
影响因子：
9.4
通讯作者：
Mengqiang Zhao;W. Pan
中科院分区：
文献类型：
--
作者：
Mengqiang Zhao;W. Pan
系统地研究了一系列掺钛Y_2O_3稳定的ZrO_2(YSZ)固溶体的晶格结构和热导率的演化。确定了钛掺杂降低导热系数的机理。在某一临界成分因子(x⩽0.08)以下，Ti4+主要取代了Zr4+，高于此临界成分因子时，需要单独考虑间隙位Ti4+。定量地讨论了Ti4+和Zr4+离子的质量和半径差异引起的晶格缺陷对声子散射系数的影响。在高掺钛量时，间隙Ti4+离子减少了氧空位，提高了材料的导热系数。综合相稳定性和热机械性能，掺钛YSZ被认为是一种很有前途的高温热障涂层。
The evolution of lattice structure and thermal conductivity has been studied systematically for a range of Ti-doped, Y2O3-stabilized ZrO2(YSZ) solid solutions. The mechanism of reducing the thermal conductivity by Ti doping has been determined. Ti4+mainly substitutes for Zr4+below a critical composition factor (x⩽0.08), above which the interstitial Ti4+need to be considered separately. The effect of lattice defects caused by mass and radius differences between Ti4+and Zr4+ions on the phonon scattering coefficient was discussed quantitatively. And the reduction of oxygen vacancy by interstitial Ti4+ions which increases the thermal conductivity at high Ti doping content was also determined. Concerning the integrated phase stability and thermo-mechanical properties, Ti-doped YSZ is believed to be a promising candidate for thermal barrier coatings at higher temperature.