Patent ID: 9396873
Filing Date: 2016-07-19
CPC Classification: B22F,C22C,H01F,Y10T

Claim Text:
1. A method for manufacturing a dust core comprising: a first mixing process for mixing a soft magnetic powder and an inorganic insulating powder; a heating process for heating a mixture of the soft magnetic powder and the inorganic insulating powder; a binder addition process for adding a silane coupling agent and a silicone resin as a binder resin to the mixture of the soft magnetic powder and the inorganic insulating powder heated in the heating process; a second mixing process for mixing a lubricant resin with a mixture of the soft magnetic powder, the inorganic insulating powder, the silane coupling agent and the silicone resin; a molding process for compression-molding a mixture of the soft magnetic powder, the inorganic insulating powder, the binder resin, and the lubricant resin so as to form a mold; and an annealing process for annealing the mold, wherein an added amount of the inorganic insulating powder is 0.4-0.8 wt % with respect to the soft magnetic powder, the heating process is performed in a non-oxidizing atmosphere at 1000° C. or more and also below a sintering temperature of the soft magnetic powder.