铁硅铝磁粉芯的绝缘包覆研究

Investigation of Coating Process of Fe-Si-Al Powder Core

摘要:

研究了钝化工艺及不同无机粘结剂对铁硅铝磁粉芯性能的影响。铁硅铝粉末用0.4% (质量分数, 下同)的磷酸液钝化，用0.9%的玻璃粉粘结，在1980 MPa下压制成环形样品，700 ℃氮气气氛保护下退火热处理1 h所制备的铁硅铝磁粉芯综合性能最佳。其有效磁导率可达125.98, 50 kHz/100 mT下的体积损耗为316.7 mW/cm3。综合磁性能和有机粘结剂制备的铁硅铝磁粉芯相当，但可以大大提高样品的径向抗拉强度，达到261 N，无需固化处理。同时提高了磁粉芯在使用过程中的抗老化能力

Abstract:

The effect of phosphate passivation and different inorganic adhesives on properties of Fe-Si-Al powder core was investigated. When the Fe-Si-Al magnetic powder core is made from the powder passivated in 0.4 wt% phosphoric acid solution, coated with 0.9 wt% of low melting point glass powder, compacted under 1980 MPa and annealed at 700 oC for 1 h in N2 atmosphere, it presents the optimum magnetic properties. Its effective permeability is 125.98, the total core loss is 316.7 mW/cm3 (f=50 kHz, Bm=100 mT). Besides, tensile strength of the core is 261 N. Meanwhile, it improves the anti-aging ability of Fe-Si-Al powder core during using