Influence of doping Mg2+ or Ti4+ captions on the microstructures, thermal radiation and thermal cycling behavior of plasma-sprayed Gd2Zr2O7 coatings
Influence of doping Mg2+ or Ti4+ captions on the microstructures, thermal radiation and thermal cycling behavior of plasma-sprayed Gd2Zr2O7 coatings
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Mg2或Ti4掺杂对等离子喷涂Gd2Zr2O7涂层微观结构、热辐射和热循环行为的影响
DOI：
10.1016/j.ceramint.2020.02.076
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发表时间：
2020-06
影响因子：
5.2
通讯作者：
Xueqiang Cao
中科院分区：
文献类型：
--
作者：
Dezheng Wang;Shujuan Dong;Jinyan Zeng;Panpan Liang;Huiqi Liao;Yihui Wang;Jianing Jiang;Longhui Deng;Xin Zhou;Xueqiang Cao
由过渡金属Ti和碱土金属Mg掺杂的锆酸钆（Gd2Zr2O7）涂层有望改善热辐射性能，并可结合其优异的热障性能全面提高隔热性能。结果表明：母质gd2zr2o7粉末以及Gd-site和Zr-site取代粉末在Fd-3m空间群中结晶为焦绿石gd2zr2o7，而喷涂涂层均为萤石相和少量焦绿石相的组合；gd2zr2o7陶瓷具有较高的中红外发射率，Ti4+在gd2zr2o7中加入后，在特定的波数范围内，主要是在近红外（0.75 ~ 2.5 μm）波段，由于杂质能级的增加导致了电子跃迁的增强，导致了导带的加宽。在1073 K时，gd2zr2o7基涂层的红外光谱发射率大于0.88。单层掺杂gd2zr2o7涂层的热循环寿命非常低，与母涂层相似，主要与低断裂韧性有关，尽管（Gd1-xMgx） 2zr2o7系列的导热系数低于母涂层。
Gadolinium zirconate (Gd2Zr2O7) coatings doped by the transition metal Ti and the alkaline earth metal Mg were expected to have improved thermal radiation performance, which could be combined with their excellent thermal barrier properties to comprehensively improve the thermal insulating performance. The results show that the parent Gd2Zr2O7powder as well as the Gd-site and Zr-site substituted powders crystallize as pyrochlore Gd2Zr2O7in Fd-3m space group, while all the as-sprayed coatings have the combination of fluorite and a little part of pyrochlore phase. Gd2Zr2O7ceramic has high mid-infrared emittance and the addition of Ti4+into Gd2Zr2O7can enhance the infrared absorption/emittance in a specific wavenumber range, dominantly in the near-infrared (0.75–2.5 μm) band due to the enhancement of electron transition induced by the impurity energy levels linked to the widening of the conduction band. The normal spectral infrared emissivity of Gd2Zr2O7-based coating was higher than 0.88 at 1073 K. The monolayered doped Gd2Zr2O7coatings present very low thermal cycling lifetime, similar with the parent coating, mainly related with their low fracture toughness, despite (Gd1-xMgx)2Zr2O7series display lower thermal conductivity than the parent one.
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DOI：
10.1007/s00339-019-2835-y
发表时间：
2019-07
期刊：
Applied Physics A
影响因子：
--
作者：
Junjing Duan;Zhangyi Huang;Chen Shi;Yao Yang;Jianqi Qi;Yutong Zhang;Yanli Shi;Z. Tang;T. Lu
通讯作者：
Junjing Duan;Zhangyi Huang;Chen Shi;Yao Yang;Jianqi Qi;Yutong Zhang;Yanli Shi;Z. Tang;T. Lu
DOI：
10.1006/jcht.1994.1042
发表时间：
1994-02
期刊：
The Journal of Chemical Thermodynamics
影响因子：
--
作者：
J. G. Edwards
通讯作者：
J. G. Edwards
La2Hf2O7 陶瓷作为热/环境屏障涂层的潜在面漆材料
影响因子：
5.2
作者：
Panpan Liang;Shujuan Dong;Jinyan Zeng;Jieyan Yuan;Jianing Jiang;Longhui Deng;Xin Zhou;Xueqiang Cao
通讯作者：
Xueqiang Cao
影响因子：
6
作者：
Jie Wu;N. Padture;M. Gell
通讯作者：
Jie Wu;N. Padture;M. Gell
影响因子：
4
作者：
V. Darakchieva;M. Xie;F. Tasnádi;I. Abrikosov;L. Hultman;B. Monemar;J. Kamimura;K. Kishino
通讯作者：
V. Darakchieva;M. Xie;F. Tasnádi;I. Abrikosov;L. Hultman;B. Monemar;J. Kamimura;K. Kishino