High wave transmittance and low thermal conductivity Y-a-SiAlON porous ceramics for high-temperature radome applications  

作　　者：Runwu Yang Jie Xu Jia Guo Xuanyu Meng Ping Zhang Fengying Fan Yanan Qu Feng Gao 

机构地区：[1]State Key Laboratory of Solidification Processing,MIIT Key Laboratory of Radiation Detection Materials and Devices,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi'an 710072,China [2]NPU-QMUL Joint Research Institute of Advanced Materials and Structure,Northwestern Polytechnical University,Xi'an 710072,China [3]Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China

出　　处：《Journal of Advanced Ceramics》2023年第6期1273-1287,共15页先进陶瓷（英文）

基　　金：supported by the International Cooperation Foundation of Shaanxi Province,China(No.2022KW-34);the National Natural Science Foundation of China(Nos.52072301,51908551,and 52272123);State Key Laboratory of New Ceramics&Fine Processing,Tsinghua University(No.KFZD202102);the Fundamental Research Funds for the Central Universities(No.D5000210722);Guangxi Science and Technology Plan Project(No.Gui Ke AB22035043);State Key Laboratory of Materials Processing and Die&Mould Technology,Huazhong University of Science and Technology(No.P2023-003).

摘　　要：With the development of hypersonic vehicle technology,ceramic-based radome materials are highly demanded due to their high operating temperatures,good dielectric properties,and high mechanical properties.Althoughα-SiAlON is an ideal material for radome applications,its intrinsic low transmittance and high thermal conductivity limit its applications.Herein,we prepared Y-α-SiAlON porous ceramics through tert-butanol(TBA)gel-casting using the self-synthesizedα-SiAlON powder.The Y-α-SiAlON porous ceramics exhibited a uniform micron-level connected pore structure with the porosity(P)of 44.2%-58.6%.The real part of permittivity(s')was 3.13-4.18(8.2-12.4 GHz),which decreased significantly with the increasing porosity.The wave transmittance(|T|^(2))of the sample with porosity of 58.6%could exceed 80%in the thickness range of 6-10 mm.The thermal conductivity was maintained at a low level of 1.38-2.25 W·m^(-1)·K^(-1) owing to the introduction of the pore structure.The flexural strength was 44.73-88.33 MPa,which may be increased by rod-likeα-SiAlON grains.The results indicate that the prepared Y-α-SiAlON porous ceramics meet the requirements of high-temperature wave-transmitting materials for radome applications.

关 键 词：a-SiAlON porous ceramics wave-transmittance materials thermal conductivity flexural strength 

分 类 号：TQ174.1[化学工程—陶瓷工业]