公开(公告)号：US20110274576A1

公开(公告)日：2011-11-10

申请号：US13188638

申请日：2011-07-22

申请人： Masaki SUGIYAMA ,  Toshiya YAMAGUCHI ,  Shinjiro SAIGUSA ,  Mitsutoshi AKIYAMA

发明人： Masaki SUGIYAMA ,  Toshiya YAMAGUCHI ,  Shinjiro SAIGUSA ,  Mitsutoshi AKIYAMA

IPC分类号： B22F3/12

CPC分类号： C22C1/051 ,  B22F1/02 ,  B22F2003/145 ,  B22F2003/248 ,  B22F2998/10 ,  B22F2999/00 ,  C22C2202/02 ,  H01F1/0577 ,  H01F1/26 ,  H01F41/0246 ,  B22F3/24 ,  B22F2201/02 ,  B22F3/1007 ,  B22F3/14

摘要： An object of the present invention is to provide a method for producing a dust core wherein generation of iron oxide at grain boundaries in the dust core is unlikely to take place upon annealing of the dust core subjected to compaction, thus allowing excellent electromagnetic characteristics to be realized. Also, the following is provided: a method for producing a dust core, which comprises: a step of molding a magnetic powder comprising a powder for a dust core formed with an iron-based magnetic powder coated with a silicone resin into a dust core via compaction; and a step of annealing the dust core via heating so as to cause the silicone resin contained in the dust core to be partially formed into a silicate compound, wherein annealing of the dust core is carried out at a dew point of an inert gas of −40° C. or lower in an inert gas atmosphere in the annealing step.

摘要翻译： 本发明的目的在于提供一种粉尘芯的制造方法，其特征在于，在经过压实的压粉芯退火后，在粉尘芯中产生铁氧化物不容易发生，从而使电磁特性优异 实现了 另外，提供以下内容：一种压粉芯的制造方法，其特征在于，包括以下步骤：将形成有由硅酮树脂涂覆的铁基磁性粉末形成的粉尘的粉末的磁性粉末成型为粉尘芯， 压实 以及通过加热对所述防尘芯体进行退火以使所述防尘芯体中包含的硅酮树脂部分地形成为硅酸盐化合物的步骤，其中所述防尘芯的退火在所述惰性气体的露点处进行， 在退火步骤中的惰性气体气氛中为40℃以下。