La₂O₃-Al₂O₃-HfO₂ ceramics were prepared by solid reaction of La₂Hf₂O₇ ceramic powders which were synthesized by solution combustion and commercial alumina powders at 1600 °C in air for 10 h. Phase variation and thermophysical properties of La₂O₃-Al₂O₃-HfO₂ ceramics were investigated. With the increase of alumina content, LaAlO₃, HfO₂ and LaAl₁₁O₁₈ phase structures appeared. The thermal expansion coefficients gradually increased with the increase of alumina content from 1000 °C to 1300 °C. The thermal conductivities of La₂O₃-Al₂O₃-HfO₂ ceramics had nonlinear variation with the increase of alumina content and reached the lowest value around 1.1 W·m⁻¹·K⁻¹ when the ratio of La₂Hf₂O₇ to Al₂O₃ was 1:0.25. Therefore, the La₂O₃-Al₂O₃-HfO₂ ceramics with a proper content of alumina can be considered as a new thermal barrier materials. Meanwhile, as potential application as interface layer in TBC, La₂O₃-Al₂O₃-HfO₂ ceramics are beneficial to improve the effectiveness of the thermal barrier coating.

La ₂ O ₃ -Al ₂ O ₃ -HfO ₂陶瓷是通过La ₂ Hf ₂ O ₇陶瓷粉末的固相反应制备的，该粉末通过固溶燃烧与市售氧化铝粉末在1600°C的空气中反应10 h。研究了La ₂ O ₃ -Al ₂ O ₃ -HfO ₂陶瓷的相变和热物理性质。随着氧化铝含量的增加，LaAlO ₃，HfO ₂和LaAl ₁₁ O ₁₈相结构出现。随着氧化铝含量的增加，从1000°C到1300°C，热膨胀系数逐渐增加。La ₂ O ₃ -Al ₂ O ₃ -HfO ₂陶瓷的导热系数随氧化铝含量的增加呈非线性变化，当La ₂ Hf ₂的比值达到1.1 W·m ^-1 ·K ^-1时达到最低。Ò ₇与Al ₂ ö ₃为1：0.25。因此，La ₂ O ₃ -Al ₂ O ₃ -HfO ₂具有适当含量的氧化铝的陶瓷可以被认为是一种新型的热障材料。同时，作为在TBC中作为界面层的潜在应用，La ₂ O ₃ -Al ₂ O ₃ -HfO ₂陶瓷有利于提高热障涂层的有效性。