材料科学
单斜晶系
固溶体
四方晶系
微观结构
相(物质)
陶瓷
断裂韧性
热液循环
立方氧化锆
分析化学(期刊)
化学工程
矿物学
结晶学
晶体结构
复合材料
冶金
色谱法
有机化学
化学
工程类
作者
Zijian Yu,Tao Qi,Gao Min,Weigang Zhang,Zihao Hu,Xiaoming Sun
标识
DOI:10.1016/j.ceramint.2023.05.168
摘要
Y2O3–ZrO2–HfO2 solid-solution powders with different HfO2 contents were prepared via high-pressure hydrothermal synthesis and sintered into ceramics. The phase compositions and microstructures of the solid solutions formed were investigated in detail. The results indicated that the solid solution stabilised by 3 mol% Y2O3 consisted of a monoclinic phase and tetragonal phase with an HfO2 content of ≤25 mol%, but the solid solution changed to a mixture of monoclinic and cubic phases with an HfO2 content of ≥50 mol%. The increase in the HfO2 content weakened the stabilising effect of Y2O3 and made the system tend toward the cubic phase. In addition, compared with the other samples, the solid solution with equal molar ratios of Zr and Hf exhibited the lowest thermal conductivity, and had higher hardness and fracture toughness, which was related to the formation of superstructures.
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