二次酸化表面改性制备高体积电阻率FeSiCr合金磁粉芯  

Enhancement of Volume Resistivity FeSiCr Alloy Magnetic Powder Core by Surface Modification Using Secondary Acidification Processing

作　　者：程丹妮 李开沥 余红雅[1] 刘仲武[1] CHENG Danni;LI Kaili;YU Hongya;LIU Zhongwu(School of Materials Science and Engineering,South China University of Technology,Guangzhou 510640,China)

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510641

出　　处：《材料科学与工程学报》2021年第2期259-263,287,共6页Journal of Materials Science and Engineering

摘　　要：FeSiCr合金粉末具有强耐腐蚀性,通过弱酸磷化的方式无法有效改善FeSiCr合金磁粉芯的绝缘性。本研究以盐酸乙醇溶液作为二次酸化剂,对磷化(一次酸化)的FeSiCr合金粉末表面改性,制备高体积电阻率FeSiCr合金磁粉芯。通过扫描电镜、LCR电桥和超高阻微电流测试仪分析盐酸乙醇溶液浓度对FeSiCr合金粉体微观形貌,交流磁学性和体积电阻率的影响。研究结果表明,二次酸化法表面改性FeSiCr合金粉末,可有效增加合金磁粉芯体积电阻率,降低高频损耗因子。其复数磁导率实部随盐酸乙醇溶液浓度增加而降低。当盐酸乙醇溶液浓度为5.0wt.%,FeSiCr合金磁粉芯体积电阻率可达7.85×10^(8)Ω·m,在1MHz测试条件下损耗因子为0.053Ω/μH。FeSiCr alloy powder core with high volume resistivity was successfully prepared by a secondary acidification process with phosphoric acid aqueous solution and hydrochloric acid ethanol solution in this paper.SEM and LCR electrical bridge meter were used to test the morphology,structure and magnetic properties of the FeSiCr alloy powder core.As a result,the secondary acidification enabled to increase the volume resistivity of the magnetic powder core and to reduce the high-frequency loss factor.At the same time,the real part of the complex magnetic permeability of the magnetic powder core decreases as the concentration of ethanol hydrochloride increases.Optimized magnetic properties(volume resistivity of 7.85×10^(8)Ω·m and loss factor of 0.053Ω/μH at 1 MHz)had been achieved for the FeSiCr powder core acidized with 5.0 wt.%ethanol hydrochloride.

关 键 词：二次酸化 体积电阻率 复数磁导率 损耗因子 

分 类 号：TF125.8[冶金工程—粉末冶金]