Gd2(CexZr1-x)2O7陶瓷材料的热物理性能研究

Thermophysical Properties of Gd2(CexZr1-x)2O7 Ceramic Materials

以Gd2O3、ZrO2、CeO2为原料,采用高温固相反应法制备了Gd2Zr2O7和Gd2(CexZr1-x)2O7(x分别为0.1,0.2,0.3)陶瓷材料。用X射线衍射法分析了其相组成,用扫描电镜观察了其显微形貌,用激光热导仪和高温热膨胀仪分别测量了材料的热扩散系数和热膨胀系数。结果表明,实验获得了具有烧绿石结构的Gd2Zr2O7和具有缺陷型萤石结构的Gd2(CexZr1-x)2O7陶瓷材料,且它们的显微组织致密,晶界清晰干净。CeO2的掺杂提高了Gd2Zr2O7陶瓷的热膨胀系数,降低了Gd2Zr2O7陶瓷热导率。这使得Gd2(CexZr1-x)2O7陶瓷可以用作新型的热障涂层材料。

Gd2Zr2O7 and Gd2(CexZr1-x)2O7 (x is 0.1, 0.2, 0.3, respectively) ceramic materials were prepared by high temperature solid state reaction using Gd2O3, ZrO2 and CeO2 as raw materials. The phase composition was analyzed by X-ray diffraction. The microstructure of the material was observed by scanning electron microscopy. The thermal diffusivity and thermal expansion coef ficient of the material were measured by laser thermal conductivity meter and high temperature dilatometer. The results show that Gd2Zr2O7 with defective pyrochlore structure and Gd2(CexZr1-x)2O7 (x is 0.1, 0.2, 0.3, respectively) ceramics with fluorite structure are synthesized, and the microstructure is dense and the grain boundaries are clear and clean. The introduction of CeO 2 improves the thermal expansion coef ficient of Gd2Zr2O7ceramics and reduces the thermal conductivity of Gd2Zr2O7 ceramics. This allows Gd2(CexZr1-x)2O7 ceramics to be used as a new thermal barrier coating material.