Preparation and characterization of SrZrO3-La2Ce2O7 composite ceramics as a thermal barrier coating material
Preparation and characterization of SrZrO3-La2Ce2O7 composite ceramics as a thermal barrier coating material
复制标题
热障涂层材料SrZrO3-La2Ce2O7复合陶瓷的制备及表征
DOI：
10.1016/j.matchemphys.2020.122904
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发表时间：
2020-06-01
影响因子：
4.6
通讯作者：
Ma, Wen
中科院分区：
文献类型：
--
作者：
Liu, Ying;Bai, Yu;Ma, Wen
采用共沉淀-煅烧法合成了（1-x）SrZrO 3-xLa（2）Ce（2）O（7）（x = 0，SZ; x = 0.3，S7 L3; x = 0.5，S5 L5; x = 0.7，S3 L7; x = 1，LC）复合粉体。通过在1600 ℃下无压烧结6 h来制造复合材料块体。X射线衍射（XRD）结果表明，SZ-LC复合粉末和块体由SZ和/或LC相组成。S7 L3和S5 L5块体在烧结态和1450 ℃热处理不同时间后均显示出较高的显微硬度。它们的热膨胀系数（TEC）揭示了SZ-LC块体的相变的积极影响。通过热分析仪（DSC）和TEC分析确定，复合材料块体从室温到1400 ℃具有良好的相稳定性。在相同的温度范围内，与SZ和8wt%Y2O3稳定的ZrO 2（8 YSZ）相比，S5 L5块体具有非常低的热导率（0.97 W m（-1）K-1，1200 ℃）。因此，S5 L5复合陶瓷被认为是在比8 YSZ更高的温度下用于热障涂层应用的潜在材料。
The (1-x)SrZrO3-xLa(2)Ce(2)O(7)(x = 0, SZ; x = 0.3, S7L3; x = 0.5, S5L5; x = 0.7, S3L7; x = 1, LC) composite powders were synthesized by a coprecipitation-calcination method. The composite bulks were fabricated by pressureless sintering at 1600 degrees C for 6 h. The X-ray diffraction (XRD) results indicated that the SZ-LC composite powders and bulks were comprised of the SZ and/or LC phase. The S7L3 and S5L5 bulks showed higher microhardness both in the as-sintered state and after heat-treatment at 1450 degrees C for different times. Their thermal expansion coefficients (TECs) revealed a positive effect on the phase transitions of the SZ-LC bulks. The composite bulks showed good phase stability from room-temperature to 1400 degrees C, determined by thermal analysis apparatus (DSC) and TEC analyses. The S5L5 bulk had very low thermal conductivity (0.97 W m(-1) K-1, 1200 degrees C) compared with SZ and 8 wt% Y2O3-stabilized ZrO2 (8YSZ) over the same temperature range. Therefore, the S5L5 composite ceramics is considered to be a potential material for thermal barrier coating applications at higher temperatures than 8YSZ.