Structure and electromagnetic characteristics of nanocrystalline FeSiAl flaky powders
Nowadays, electromagnetic interference (EMI) brought with electronic device is very serious. This article study one of soft magnetic metal material using for anti-EMI. This alloy is FeSiAl. At first, alloy ribbons prepared by melt-quench were annealed at 873K and 923K for 60min protected by nitrogen atmosphere respectively. Then, the annealed ribbons were milled for 30h, 50h, 70h and 90h, and the flaky powders were prepared. Powders profiles of different milling time are analyzed by Scanning Electron Microscope (SEM). The transformation of crystal structure is studied by X-ray Diffraction (XRD). Complex permeability and complex permittivity in the frequency band of 0.5-8 GHz are measured by microwave vector network analyzer. Ordered DO3 superlattice of powders increase with the anneal temperature increasing. The aspect ratio of flaky powders increases with the ball milling time increasing. During milling, the novel Al element is precipitated, and the grain is nanocrystallization. Milled for 70h, the lattice constant is 0.2845 nm; it is the least in the four samples, and the specific saturation magnetism is the largest. The values of μ and μ are 5.5 and 4.5 respectively. It can be used for microwave absorber.
flaky powder lattice constant nanocrystallization specific saturation magnetism complex permittivity complex permeability
周廷栋 邓龙江 梁迪飞
电子科技大学微电子与固体电子学院,成都610054;西华大学材料学院,成都610039 电子科技大学微电子与固体电子学院,成都610054
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）