摘要
采用气雾化技术并结合模压成形方法制备Fe-3Si-2Ni-0.5Al-2Ti磁粉芯,通过热分析仪、X射线衍射仪、电子探针以及软磁交流测量装置表征和分析了绝缘包覆剂的热稳定性、磁粉芯的相组成、碳氧含量及磁性能,并探讨退火温度、升温速率、保温时间对磁粉芯性能的影响。结果表明:随退火温度由180℃升高至280℃,磁粉芯的矫顽力下降,磁导率增大,损耗降低;但进一步升高至380℃时,磁粉芯性能下降。升温速率过快(3℃/min)或过慢(1℃/min),均不利于磁粉芯性能的提高,较佳升温速率为2℃/min。当保温时间由60 min延长至90 min时,磁粉芯的矫顽力下降、有效磁导率增大、损耗降低;但进一步延长保温时间(150 min)对磁粉芯性能的改善并不明显。
Fe-3Si-2Ni-0.5Al-2Ti magnetic powder cores were prepared by gas atomization and compression molding. The thermal stability of insulation binder, phase composition, carbon and oxygen content, magnetic properties of magnetic powder cores were analyzed by thermal analyzer, X-ray diffractometer, electron probe microanalyzer, and soft magnetic alternating current measurement, respectively. The effects of annealing temPerature, heating rate, and holding time on the magnetic properties of magnetic powder cores were investigated. The results show that when the annealing temperature increases from 180 to 280 ℃, the coercivity decreases, effective magnetic permeability increases and loss decreases. However, further increment of the temperature deteriorates magnetic properties of the magnetic powder cores. The fast heating rate （3 ℃/min） or the slow one （1 ℃/min） are detrimental to improve the magnetic properties of cores, the optimal one is 2 ℃/min. when the holding time prolongs from 60 to 90 min, the coercivity decreases, effective magnetic permeability increases and the loss decreases. But further increment of the holding time can＇t improve magnetic properties of the cores obviously.
出处
《粉末冶金材料科学与工程》
EI
北大核心
2015年第2期218-224,共7页
Materials Science and Engineering of Powder Metallurgy
基金
科技部科研院所技术开发研究专项资金(2010EG215058)
