Microstructural and compositional evolution of core-shell FeSiAl composites during high-temperature annealing. Issue 17 (1st December 2019)

• Record Type: Journal Article
• Authors: Liu, Dong; Gao, Shanmin; Zhang, Yue; Yu, Shengtao; Wang, Feng
• Is Part Of: Ceramics international. Volume 45:Issue 17(2019)Part A
• Page Start: 21804
• Page End: 21809
• Publication Date: 2019-12-01
• Subjects: Magnetic composites -- Microstructure -- Oxidation coating -- Nucleation mechanism; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.07.183
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Core-shell structured magnetic composites containing a FeSiAl core and oxides shell were prepared by HNO3 oxidation. Microstructure evolution and phase composition of the insulation coatings correlated to magnetic properties have been revealed during high-temperature annealing. Results indicate that spherical nanoparticles composed of iron oxides may form on the coating surface after annealing at 700 °C followed by growing into larger wirelike particles by raising annealing temperature to 800 °C. The nucleation mechanism of the nanoparticles was presented according to the LaMer model and the growth regimes can be attributed to aggregative growth by mutual fusion. Largely enhanced magnetic properties ( μ e = 167.3, P cv = 205.6 mW/cm 3 ) have been achieved annealed at 750 °C.