(Si_(0.2)Ti_(0.2)Nb_(0.2)Ta_(0.2)V_(0.2))C高熵陶瓷的低温制备及吸波性能  

Low-temperature Preparation and Microwave Absorbing Properties of(Si_(0.2)Ti_(0.2)Nb_(0.2)Ta_(0.2)V_(0.2))C High-entropy Ceramic

作　　者：张昊 黄宗玥 张妍彬 魏剑[1] ZHANG Hao;HUANG Zongyue;ZHANG Yanbin;WEI Jian(School of Materials Science and Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学材料科学与工程学院,西安710055

出　　处：《材料导报》2024年第3期42-47,共6页Materials Reports

基　　金：国家自然科学基金面上项目(51578448,52272089);国家自然科学青年基金项目(51308447,52202113);陕西省优秀青年科学基金(2021JC-43);中国博士后面上基金(2021M702550);陕西省教育厅协同创新项目(20JY042);陕西省教育厅自然科学专项(19JK0463)。

摘　　要：寻求具有良好耐高温及力学性能的新型陶瓷材料是吸波材料领域的研究热点之一。高熵碳化物陶瓷具有高温热稳定性及抗氧化性好等优点,但合成温度高且吸波性能研究较少,限制了其在高温吸波材料领域的应用。本工作采用熔盐法合成了多晶岩盐晶型(Si_(0.2)Ti_(0.2)Nb_(0.2)Ta_(0.2)V_(0.2))C高熵碳化物陶瓷,研究了其物相组成、微观形貌及吸波特性。结果表明:随着反应温度的升高,样品的衍射峰逐渐锐化,吸波性能明显提高。当反应温度为1500℃时,3.72 GHz时最低反射损耗达-34.68 dB;与已报道的高熵碳化物陶瓷相比,在相同的有效吸收带宽(2.3 GHz)下,涂层厚度减少了13.3%(1.5 mm降低到1.3 mm),其介电损耗主要来源于极化损耗和导电损耗。本工作制备的高熵碳化物陶瓷可以为研究制备新型环境适应、耐高温、抗冲击的高性能单相吸波材料提供新途径。Seeking electromagnetic shielding materials with good physical properties is one of the hot spots in electromagnetic wave absorption.High entropy ceramics have the advantages of high temperature thermal stability and good oxidation resistance,but the high synthesis temperature and lack of research on wave-absorbing properties limit their development in the field of high-temperature wave absorption.In this work,polycrystalline rock salt type(Si_(0.2)Ti_(0.2)Nb_(0.2)Ta_(0.2)V_(0.2))C high entropy carbide ceramics were synthesized by molten salt method,and their phase composition,microscopic morphology and wave absorption properties were investigated.The results show that the diffraction peak of the sample shar-pened gradually with the increase of the reaction temperature and the absorption performance improved significantly.When the reaction temperature is 1500℃,the lowest reflection loss reaches-34.68 dB at 3.72 GHz.Compared with the reported high-entropy carbide ceramics,the coa-ting thickness is reduced by 13.3%(1.5 mm to 1.3 mm)for the same effective absorption bandwidth(2.3 GHz),and the dielectric loss mainly comes from polarization loss and conductivity loss.The high-entropy carbide ceramics prepared in this paper can provide a new avenue for research on the preparation of new environmentally adapted,high-temperature resistant and shock-resistant high-performance single-phase absor-bing materials.

关 键 词：高熵碳化物陶瓷 吸波材料 吸波性能 介电损耗 熔盐法 

分 类 号：TB332[一般工业技术—材料科学与工程]