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Microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and preparation method thereof
The invention discloses a microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and a preparation method thereof, and aims to solve the problems that when a pyrochlore-based ceramic material serves for a long time at a high temperature, the thermal insulation effect is insufficient, and the thermodynamic property is reduced due to grain growth. The preparation method comprises the following steps: 1, weighing raw materials according to the chemical formula of (YbxRE1yRE2yRE3yRE4y) 2B2O7; 2, adding a binder and an absolute ethyl alcohol solvent into the raw materials, and carrying out ball milling and mixing; 3, preparing a ceramic green body by adopting a dry pressing molding process; 4, performing high-temperature glue discharging treatment on the ceramic green body; and 5, carrying out solid-phase sintering on the ceramic green body after glue removal. The adopted high-entropy ceramic component comprises at least one element with the radius difference larger than that of Yb ions by 6.9%, severe lattice distortion is induced, a two-phase coexistence region of pyrochlore and fluorite is formed, the heat conductivity of the ceramic material is remarkably reduced, diffusion of the two-phase coexistence region is restrained, and the grain growth rate is reduced.
一种微结构可控的低热导双相高熵陶瓷材料及其制备方法，本发明是为了解决烧绿石基陶瓷材料在高温下长时间服役时，存在隔热效果不足、晶粒长大导致热力学性能降低的问题。制备方法：一、按照(YbxRE1yRE2yRE3yRE4y)2B2O7化学式称取原料；二、向原料中加入粘结剂和无水乙醇溶剂进行球磨混合；三、采用干压成型工艺制备得到陶瓷生胚；四、对陶瓷生胚进行高温排胶处理；五、对排胶后的陶瓷生胚进行固相烧结。本发明采用的高熵陶瓷组元包含至少一种与Yb离子半径差异大6.9％的元素，诱发严重的晶格畸变并形成烧绿石与萤石的双相共存区，显著降低了陶瓷材料的热导率，同时双相共存区扩散受到抑制降低了晶粒生长速率。
Microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and preparation method thereof
The invention discloses a microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and a preparation method thereof, and aims to solve the problems that when a pyrochlore-based ceramic material serves for a long time at a high temperature, the thermal insulation effect is insufficient, and the thermodynamic property is reduced due to grain growth. The preparation method comprises the following steps: 1, weighing raw materials according to the chemical formula of (YbxRE1yRE2yRE3yRE4y) 2B2O7; 2, adding a binder and an absolute ethyl alcohol solvent into the raw materials, and carrying out ball milling and mixing; 3, preparing a ceramic green body by adopting a dry pressing molding process; 4, performing high-temperature glue discharging treatment on the ceramic green body; and 5, carrying out solid-phase sintering on the ceramic green body after glue removal. The adopted high-entropy ceramic component comprises at least one element with the radius difference larger than that of Yb ions by 6.9%, severe lattice distortion is induced, a two-phase coexistence region of pyrochlore and fluorite is formed, the heat conductivity of the ceramic material is remarkably reduced, diffusion of the two-phase coexistence region is restrained, and the grain growth rate is reduced.
一种微结构可控的低热导双相高熵陶瓷材料及其制备方法，本发明是为了解决烧绿石基陶瓷材料在高温下长时间服役时，存在隔热效果不足、晶粒长大导致热力学性能降低的问题。制备方法：一、按照(YbxRE1yRE2yRE3yRE4y)2B2O7化学式称取原料；二、向原料中加入粘结剂和无水乙醇溶剂进行球磨混合；三、采用干压成型工艺制备得到陶瓷生胚；四、对陶瓷生胚进行高温排胶处理；五、对排胶后的陶瓷生胚进行固相烧结。本发明采用的高熵陶瓷组元包含至少一种与Yb离子半径差异大6.9％的元素，诱发严重的晶格畸变并形成烧绿石与萤石的双相共存区，显著降低了陶瓷材料的热导率，同时双相共存区扩散受到抑制降低了晶粒生长速率。
Microstructure-controllable low-thermal-conductivity double-phase high-entropy ceramic material and preparation method thereof
一种微结构可控的低热导双相高熵陶瓷材料及其制备方法
CUI XIUFANG (author) / CHEN ZHUO (author) / JIN GUO (author) / JING YONGZHI (author) / ZHANG CHAO (author) / ZHANG ZHIJIA (author) / LI QICHENG (author) / WANG XIANG (author) / MA DECHANG (author)
2024-12-13
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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