期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 501, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2020.166455
关键词
Soft magnetic composites; Carbonyl iron powder; Phosphating; Mixed resin; Magnetic properties
资金
- Mentech Optical & Magnetic Co. Ltd., Dongguan, China
Fe powders based soft magnetic composites (SMCs) with organic- inorganic multiple-layer coating were fabricated by improved isolation coating followed by pressing and curing. Phosphate and organic resin were selected as the insulting layers. The influences of phosphating process and the composition of organic coating on the magnetic properties of the SMCs and soft magnetic cores have been systematically investigated. The phosphating process was modified for simple and easy operation, suitable for carbonyl iron powders with small particle size. The optimized phosphating method created a complete and continuous phosphate layer on the surface of micron sized particles. Without resin coating, the magnetic cores fabricated with the phosphated powders prepared with 0.5-0.7 wt% phosphoric acid exhibit relatively high permeability and quality factor at high frequency. In addition, a new type of mixed resin with good thermal stability was employed for insolating coating, which provides distinctly higher resistivity and better protective effect than silicone. The optimal content of the mixed resin content is about 3 wt% for fabricating the magnetic cores with low eddy current loss and hysteresis loss by producing a protective layer to isolate magnetic particles and reduce the internal stress. The SMC cores prepared with optimized phosphating process and organic coating exhibit high relative density (93.7%), high electric resistivity (2.23 x 10(7) Omega.cm), stable permeability (in the frequency range from 5 to 1000 kHz), high quality factor (44.8 at 700 kHz) and relatively low magnetic loss (159.0 kW/m(3) at 100 kHz).
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据