四价元素高熵铝硅酸盐陶瓷的制备与性能研究

doi:10.19964/j.issn.1006-4990.2025-0058

Abstract

Abstract:

The high⁃entropy strategy was explored by incorporating tetravalent elements through a solid⁃state reaction method to effectively enhance the thermophysical and mechanical properties of aluminosilicate ceramics.Four high⁃entropy aluminosilicate ceramics with different configurational entropies were successfully synthesized：0.25（Y_1/2Yb_1/2）₄Al₂O₉·0.75（Y_1/2Yb_1/2）₂（xMe_1/_x ）₂O₇（x=1，2，3，4；Me=Si，Zr，Ti，Ce）.These ceramics were systematically studied including phase composition，microstructure，thermophysical properties，and mechanical properties.The results indicated that the coefficient of thermal expansion（CTE） of the ceramic samples was gradually increased with the increase of configurational entropy.While the thermal conductivity was decreased significantly.Notably，the sample with the highest configurational entropy exhibited a thermal conductivity as low as 0.6 W/（m·℃），whereas its CTE reached 5.27×10⁻⁶ ℃^-1.In terms of mechanical properties，although the elastic modulus was decreased for the increase of entropy，both hardness and fracture toughness were markedly enhanced.Specifically，the fracture toughness achieved 2.2 MPa·m^1/2，and the Vickers hardness was measured at 8.5 GPa.Microstructural characterization revealed that grain refinement was effectively contributed to the improvement of mechanical properties.This study presented a novel approach for tailoring the thermophysical and mechanical properties of aluminosilicate ceramics and verified the significant potential of the high⁃entropy strategy in the domain of advanced ceramic materials.

Key words: high?entropy ceramics, aluminosilicate, thermophysical properties, fracture toughness

CLC Number:

TQ174.1

ZHANG Jun, ZHU Hongying, JIANG Haiyun, ZHANG Weili, WU Ruomei, HU Weida, LEI Zhiyong, LIU Bin. Study on preparation and properties of tetravalent element high⁃entropy aluminosilicate ceramics[J]. Inorganic Chemicals Industry, 2026, 58(1): 43-51.

Figures/Tables 10

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References 26

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简称	熵值	样品分组
HE-B1	1.32R	0.25（Y_1/2Yb_1/2）₄Al₂O₉·0.75（Y_1/2Yb_1/2）₂Si₂O₇
HE-B2	1.56R	0.25（Y_1/2Yb_1/2）₄Al₂O₉·0.75（Y_1/2Yb_1/2）₂（Si_1/2Zr_1/2）₂O₇
HE-B3	1.68R	0.25（Y_1/2Yb_1/2）₄Al₂O₉·0.75（Y_1/2Yb_1/2）₂（Si_1/3Zr_1/3Ti_1/3）₂O₇
HE-B4	1.76R	0.25（Y_1/2Yb_1/2）₄Al₂O₉· 0.75（Y_1/2Yb_1/2）₂（Si_1/4Zr_1/4Ti_1/4Ce_1/4）₂O₇

样品	四价平均离子半径/Å	离子半径方差/Å²	理论密度/（g·cm^-3）	实际密度/（g·cm^-3）	相对密度/%
HE-B1	0.400 0	0	4.436 3	4.371 4	98.5
HE-B2	0.560 0	0.025 6	4.487 3	4.377 0	97.5
HE-B3	0.576 7	0.027 6	4.458 7	4.301 5	96.4
HE-B4	0.650 0	0.029 4	4.509 2	4.298 9	95.3

样品	a/Å	b/Å	c/Å	β/（°）	空间群	结构
HE-B1	7.389 0	10.472 3	11.131 2	107.64	P-21/c	单斜
HE-B2	7.413 4	10.489 1	11.141 0	108.53	P-21/c	单斜
HE-B3	7.447 6	10.492 0	11.146 2	108.91	P-21/c	单斜
HE-B4	7.481 2	10.493 9	11.149 3	108.74	P-21/c	单斜

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Study on preparation and properties of tetravalent element high⁃entropy aluminosilicate ceramics

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