三元共掺杂对YSZ热障涂层热物理性能的影响

摘要

NiO, Er2O3, Yb2O3, Y2O3 and ZrO2 powders were used as raw materials to prepare composite ceramic materials by the method of high temperature solid phase synthesis. The specific heat, thermal diffusion coefficient, thermal conductivity and other thermal physical properties of the composite ceramic materials were studied and compared with the traditional 8YSZ thermal barrier coating materials. The crystal structure and phase composition were tested by XRD. The results show that after NiO, Er2O3, Yb2O3, Y2O3 and ZrO2 co-doping, the thermal diffusion coefficient is 0.36-0.56 mm2/s, which is 20% lower than that of YSZ from room temperature to 1500 ℃, the thermal conductivities is 1.45-1.55 W/(m?K), which is 18% lower than that of YSZ from room temperature to 1500 ℃, 2EYNYSZ material has single phase structure, and 1500 ℃ heat-treatment does not occur phase transition within 100 h.%采用NiO、Er2O3、Yb2O3、Y2O3、ZrO2粉末为原料，用高温固相合成法制备复合陶瓷材料，研究该复合陶瓷材料的比热、热扩散系数、热导率等热物理性能，并与传统8YSZ热障涂层材料进行对比。利用XRD测定所制备的陶瓷样块的晶体结构和物相组成，分析该陶瓷试样的物相组成及高温相稳定性。结果表明：NiO、Er2O3、Yb2O3共掺YSZ后，室温至1500 ℃范围内的热扩散系数为0.36～0.56 mm2/s，与8YSZ相比，降低了约20%；室温至1500 ℃的热导率为1.45～1.55 W/(m?K)，比8YSZ降低了18%；2EYNYSZ陶瓷材料具有单一的相结构，经1500 ℃热处理100 h之内不发生相变。