Electromagnetic wave absorption and mechanical properties of SiC nanowire/low-melting-point glass composites sintered at 580°C in air

作     者：Ranran Shi Wei Lin Zheng Liu Junna Xu Jianlei Kuang Wenxiu Liu Qi Wang Wenbin Cao Ranran Shi;Wei Lin;Zheng Liu;Junna Xu;Jianlei Kuang;Wenxiu Liu;Qi Wang;Wenbin Cao

作者机构：Department of Inorganic Nonmetallic MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijing 100083China National Demonstration Center for Materials EducationInstitute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijing 100083China Beijing Institute of Aeronautical MaterialsAero Engine Corporation of ChinaBeijing 100095China School of Materials and Environmental EngineeringHunan University of HumanitiesScience and TechnologyLoudi 417000China 

出 版 物：《International Journal of Minerals,Metallurgy and Materials》 (矿物冶金与材料学报（英文版）)

年 卷 期：2023年第30卷第9期

页      面：1809-1815页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：financially supported by the National Natural Science Foundation of China (Nos.51702011 and 51572018) the Fundamental Research Funds for the Central Universities of China (No.FRF-TP-20-006A3) the Scientific Research Project of Hunan Province Department of Education,China (No.20B323) 

主　　题：SiC nanowires glass composite flexural strength dielectric properties microwave absorption 

摘      要：Si C nanowires are excellent high-temperature electromagnetic wave (EMW) absorbing materials. However, their polymer matrix composites are difficult to work at temperatures above 300℃, while their ceramic matrix composites must be prepared above 1000℃ in an inert atmosphere. Thus, for addressing the abovementioned problems, SiC/low-melting-point glass composites were well designed and prepared at 580℃ in an air atmosphere. Based on the X-ray diffraction results, SiC nanowires were not oxidized during air atmosphere sintering because of the low sintering temperature. Additionally, SiC nanowires were uniformly distributed in the glass matrix material. The composites exhibited good mechanical and EMW absorption properties. As the filling ratio of SiC nanowires increased from 5wt%to 20wt%, the Vickers hardness and flexural strength of the composite reached HV 564 and 213 MPa, which were improved by 27.7%and 72.8%, respectively, compared with the low-melting-point glass. Meanwhile, the dielectric loss and EMW absorption ability of SiC nanowires at 8.2–12.4 GHz were also gradually improved. The dielectric loss ability of low-melting-point glass was close to 0. However, when the filling ratio of SiC nanowires was 20wt%, the composite showed a minimum reflection loss (RL) of-20.2 dB and an effective absorption (RL≤-10 dB) bandwidth of2.3 GHz at an absorber layer thickness of 2.3 mm. The synergistic effect of polarization loss and conductivity loss in SiC nanowires was responsible for this improvement.