高熵尖晶石型(Li,Mg,Al,Zn,Ga)_(3)O_(4)透明陶瓷的制备与光学性能  

Preparation and Optical Properties of High-Entropy Spinel-type(Li,Mg,Al,Zn,Ga)_(3)O_(4)Transparent Ceramics

作　　者：张超杰 涂广升 靖正阳 涂兵田[1,2] 王皓 ZHANG Chaojie;TU Ghuangsheng;JING Zhengyang;TU Bingtian;WANG Hao(State Key Lab of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China;Hubei Longzhong Laboratory,Xiangyang 441000,Hubei,China)

机构地区：[1]武汉理工大学材料,复合新技术国家重点实验室,武汉430070 [2]湖北隆中实验室,湖北襄阳441000

出　　处：《硅酸盐学报》2024年第12期3806-3814,共9页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2023YFB3812000);国家自然科学基金(52272072);湖北隆中实验室自主创新研究项目(2022ZZ-13)。

摘　　要：高熵化合物可能展现出的优异物理化学性能,为新型透明陶瓷体系开发和性能调控提供了新的研究思路。本研究设计了一种高熵尖晶石型氧化物(Li,Mg,Al,Zn,Ga)_(3)O_(4)(LMAZGO),采用高温固相反应法合成了目标产物。以子晶格模型计算了体系的构型熵为3.38R,并通过长时间低温保温验证了LMAZGO高熵化合物的稳定性。结果表明:经无压烧结工艺并通过热等静压处理后,可得到光学和力学性能优异的LMAZGO高熵透明陶瓷材料,其光学透过范围为0.23~7.35μm,最高直线透过率达到85.2%;Vickers硬度、杨氏模量和弯曲强度分别为12.7 GPa、265 GPa,(332±30)MPa。高熵LMAZGO透明陶瓷的研究为新型透明陶瓷的开发提供思路。Introduction Transparent ceramics are a kind of ceramic materials integrating structural and functional properties.A variety of ceramic materials such as oxides,nitrides,oxynitrides and fluorides are developed.Among them,spinel transparent ceramics are suitable for transparent armor,mid-wave infrared windows and fairings due to their low density,high hardness,high strength,high temperature stability,especially the wide transmittance range and high transmittance from near ultraviolet to mid-infrared.The development of transparent ceramics becomes a hot research spot.The design and performance optimization of new transparent ceramics are mainly realized through composition design because transparent ceramics have some strict requirements for microstructure and phase purity.In recent years,the novel properties of the high-entropy effect in materials provide an approach for the development of materials.In this paper,a spinel-type(Li,Mg,Zn,Al,Ga)_(3)O_(4)(LMAZGO)compound was designed with MgAl_(2)O_(4),MgGa_(2)O_(4),ZnAl_(2)O_(4),ZnGa_(2)O_(4),LiGa_(5)O_(8)and LiAl_(5)O_(8)as components.The sintering process of LMAZGO high-entropy transparent ceramic materials was investigated,and the microstructure of transparent ceramics was optimized.In addition,the optical transmittance and mechanical properties of LMAZGO high-entropy transparent ceramic materials were also analyzed.Methods Commercial powders of Li_(2)CO_(3),MgO,α-Al_(2)O_(3),ZnO,and Ga_(2)O_(3)(purity of 99.99%)were used as raw materials,and the proportion of each raw material was calculated according to the elemental composition of LMAZGO.After mixing evenly,the high-entropy ceramic was synthesized in air by a high-temperature solid-state reaction method,and then ground to the target powder.LMAZGO blanks with a diameter of 20 mm were prepared via axial compression combined with cold isostatic pressing.Subsequently,the transparent ceramic pre-sintered body was prepared via pressureless pre-sintering in a muffle furnace,and the residual pores were further removed

关 键 词：高熵尖晶石 透明陶瓷 烧结工艺 光学性能 

分 类 号：TQ174[化学工程—陶瓷工业]