Corrosion behavior and magnetocaloric effect of FeNi (1J85) coated LaFe11.6Si1.4/Sn composites

Abstract

The FeNi coated LaFe11.6Si1.4/Sn composites were prepared by hot pressing (HP). The microstructure, corrosion behavior and magnetocaloric effect (MCE) of FeNi coated LaFe11.6Si1.4/Sn composites were investigated systematically. The results show that the corrosion resistance of FeNi coated LaFe11.6Si1.4/Sn composites is better than that of LaFe11.6Si1.4/Sn composites in deionized water. The maximum magnetic entropy change ((–ΔSM)max) and relative cooling power (RCP) of FeNi coated LaFe11.6Si1.4/Sn composites are 13.30 J/(kg·K) and 146.25 J/kg, respectively, which are larger than that ((–ΔSM)max, 10.65 J/(kg·K) and RCP, 106.53 J/kg) of LaFe11.6Si1.4/Sn composites in a low magnetic field change of 2 T. FeNi coated LaFe11.6Si1.4/Sn composites possess a more negative slope. The improvement of magnetic properties is due to high permeability FeNi permalloy (1J85) which improves the itinerant-electron metamagnetic (IEM) transition. So, the method of coating FeNi can provide a new idea for enhancing the corrosion resistance and magnetocaloric effect of La(FexSi1–x)13-based materials.