Abstract A series of Y 2 O 3 -doped HfO 2 ceramics (Hf 1 -x Y x O 2-0.5 × , x = 0, 0.04, 0.08, 0.12, 0.16 and 0.2) were synthesized by solid-state reaction at 1600 °C. The microstructure, thermophysical properties and phase stability were investigated. Hf 1 -x Y x O 2–0.5 x ceramics were comprised of monoclinic (M) phase and cubic (C) phase when Y 3+ ion concentration ranged from 0.04 to 0.16. The thermal conductivity of Hf 1 -x Y x O 2–0.5 x ceramic decreased as Y 3+ ion concentration increased and Hf 0.8 Y 0.2 O 1.9 ceramic revealed the lowest thermal conductivity of ~ 1.8 W/m*K at 1200 °C. The average thermal expansion coefficient (TEC) of Hf 1 -x Y x O 2–0.5 x between 200 °C and 1300 °C increased with the Y 3+ ion concentration. Hf 0.8 Y 0.2 O 1.9 yielded the highest TEC of ~ 10.4 × 10 −6 K −1 while keeping good phase stability between room temperature and 1600 °C.

中文翻译：

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Y掺杂对氧化钇稳定氧化铪陶瓷微观结构和热物理性能的影响

摘要 通过1600°固相反应合成了一系列Y 2 O 3 掺杂HfO 2 陶瓷（Hf 1 -x Y x O 2-0.5 × , x = 0, 0.04, 0.08, 0.12, 0.16 and 0.2） C。研究了微观结构、热物理性质和相稳定性。当 Y 3+ 离子浓度范围为 0.04 至 0.16 时，Hf 1 -x Y x O 2–0.5 x 陶瓷由单斜 (M) 相和立方 (C) 相组成。Hf 1 -x Y x O 2–0.5 x 陶瓷的热导率随着 Y 3+ 离子浓度的增加而降低，而 Hf 0.8 Y 0.2 O 1.9 陶瓷的热导率在 1200 °C 时最低，约为 1.8 W/m*K。Hf 1 -x Y x O 2–0.5 x 在 200 °C 和 1300 °C 之间的平均热膨胀系数 (TEC) 随着 Y 3+ 离子浓度的增加而增加。Hf 0.8 Y 0.2 O 1.9 产生的最高 TEC 约为 10。