Microwave absorption properties of rare earth alloy Nd2Co17@C/Na2SiO3 composite at elevated temperature (293–723 K) in the X band

Abstract A variety of new challenges are being faced in the development of high temperature microwave absorbing materials in the X band. Recently, some of the 2:17 phase rare-earth soft magnetic alloys with high permeability and curie temperature have shown potential to be novel X band high temperature microwave absorbing materials. In this paper, a high temperature microwave absorbing material (Nd 2 Co 17 @C/Na 2 SiO 3 ) is prepared with Nd 2 Co 17 as the raw material. After carbon cladding and Na 2 SiO 3 treatment, the composite can work stably at 723 K. The calculated absorption properties display that the reflection loss intensity of the composite with a thickness of 1.5 mm is below −6 dB in the whole X band. Moreover, the thermogravimetric analysis results and static magnetic properties before and after sintering indicate that the material has excellent resistance to oxidation. Rare earth alloy materials provide a new possibility for the research of innovative high temperature absorbing materials.