Microstructures, absorption and adhesion evolution of FeCoCr/silicone resin coatings at elevated temperature

Frontiers in Materials

Materials

Changwei Cai¹  Zhiyong Chen²  Bolin Yang²  Yujie Wang³  Dachao Yuan³  Zhihong Chen⁴ 

[1] Center for Scientific and Technological Cooperation and Achievement Transformation, Wuhan University of Technology, Wuhan, China;School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, China;School of Safety Science and Emergency Management, Wuhan University of Technology, Wuhan, China;School of Science, Wuhan University of Technology, Wuhan, China;

关键词: thermal stability;    microwave absorption;    absorbent;    silicone resin;    magnetic loss;   

DOI  :  10.3389/fmats.2023.1168418

 received in 2023-02-17, accepted in 2023-03-14,  发布年份 2023

来源: Frontiers

【 摘 要 】

Heat-resistant magnetic microwave absorption coatings are vital important for the stealth safety of apparatus working at elevated temperature or electromagnetic compatibility of high density/power electronic devices. In this work, we proposed a heat-resistant coating with nanocrystalline FeCoCr micropowders as the absorbents and silicone resin as the matrix. The evolution of microstructure, absorption and adhesion of FeCoCr/silicone resin coatings were investigated after heat treatment at 400°C. The results show that the roughness of FeCoCr powders slightly increased due to the formation of nanoparticles, while their crystalline phase maintained body-centered cubic structure with grain size increasing from 10.8 nm to 18.1 nm after heat treatment. The saturated magnetization and coercivity of FeCoCr powders also increased after heat treatment. The adhesion of FeCoCr/silicone resin coatings exhibited sharp increase with the extension of heat treatment time, i.e., from 7.59 MPa at room temperature to 11.78 MPa after heat treatment at 400°C for 10 h; this phenomenon occurred due to the condense of FeCoCr-resin interfaces. The complex permittivity of the coating was reduced after heat treatment, while the complex permeability increased; this gave rise to enhancement of microwave absorption and showed the working potential of the FeCoCr/silicone resin coatings at elevated temperature.

【 授权许可】

Unknown   
Copyright © 2023 Yuan, Chen, Cai, Yang, Wang and Chen.