采用化学共沉淀煅烧法制备不同La2O3掺杂量的La2O3-Y2O3-ZrO2(YSZ)复合陶瓷粉末,研究该复合陶瓷粉末的高温相稳定性、抗烧结性及热物理性能,并与传统应用的YSZ陶瓷粉末进行对比,以探讨La2O3-YSZ作为热障涂层材料应用的可能性.采用XRD分析陶瓷粉末的晶体结构和物相组成,研究La2O3掺杂量对YSZ高温相稳定性的影响.采用SEM观察陶瓷烧结体的微观形貌,研究La2O3掺杂对YSZ抗烧结性的影响.采用激光脉冲法测定热扩散率,通过计算得到材料的热导率.结果表明:YSZ和不同La2O3掺杂量的La2 O3-YSZ均由单一的非平衡四方相ZrO2(t'-ZrO2)组成.经1 400℃热处理100 h后,YSZ中t'-ZrO2完全转变为立方相ZrO2(c-ZrO2)和单斜相ZrO2(m-ZrO2),在0.4mol％～1.4mol％ La2O3掺杂范围内,La2O3-YSZ的相稳定性均优于YSZ,其中1.0mol％ La2O3掺杂的YSZ(1.0mol％ La2O3-YSZ)经热处理后无m-ZrO2生成,表现出良好的高温相稳定性.此外,1.0mol％ La2O3-YSZ较YSZ具有较高的抗烧结性和较低的热导率.在室温至700℃范围内,1.0mol％ La2O3-YSZ的热导率为1.90～2.17 W/(m·K),明显低于YSZ的热导率(2.13～2.33 W/(m·K)).
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