Finemet型纳米晶合金热处理工艺研究进展

Research progress on annealing process of Finemet-type nanocrystalline alloys

摘要:

热处理工艺是改善纳米晶合金软磁性能极为有效的方式,本文对纳米晶带材的热处理工艺研究状况进行了系统总结,并对不同热处理方式的优缺点进行了比较。常规退火和焦耳退火作为加热方式决定了合金退火后的晶粒尺寸和晶化相比例,是获得最佳性能的前提；磁场退火和应力退火作为外场施加方式,可以改变合金在退火后的磁滞回线形状,获得更高的感生各向异性,降低材料在一定磁场强度下的恒定磁导率。常规加热和磁场退火的发展应用已比较成熟,而焦耳加热方式和应力退火分别受工艺装备和生产效率的影响,在应用方面存在滞后。然而,焦耳退火的高效率和应力场退火后的高感生各向异性值也表现出极大的优势,具备未来产业化应用的潜力。

Abstract:

The annealing process is a very effective way to improve the soft magnetic properties of nanocrystalline alloys. In this paper, the research status of annealing process of nanocrystalline alloys are summarized and the characteristics of different annealing process are compared. Conventional annealing and Joule annealing are the key to determine the final grain size and crystallization ratio of the alloy, which is the premise to obtain the best properties. Magnetic field annealing and stress annealing can change the shape of the hysteresis loop after annealing, obtain higher induced anisotropy and reduce the constant permeability of the material under a certain magnetic field strength. Up to now, furnace annealing and magnetic field annealing are already widely applied, while joule annealing and stress annealing are affected by process equipment and production efficiency respectively, resulting in the lag of their industrial application. However, the high efficiency of Joule annealing and the extremely high induced anisotropy of stress field annealing also have significant advantages, which means the potentiality of futher industrial application.