| 摘要 |
Provided is a dust core and a method for manufacturing a thereof, having an effect that the soft magnetic powder is prevented from sintering and bonding together upon heating, the hysteresis loss can be effectively reduced, and the DC B-H characteristics is excellent. In a first mixing process, a soft magnetic powder composed mainly of iron and an inorganic insulating powder of 0.4 wt%-1.5 wt% are mixed by a mixer. A mixture obtained in the first mixing process is heated in a non-oxidizing atmosphere at 1000 °C or more and below a sintering temperature of the soft magnetic powder. In a binder addition process, a silane coupling agent of 0.1-0.5 wt% is added. A binder, e.g. a silicone resin of 0.5-2.0 wt% is added to the soft magnetic alloy powder to which the inorganic insulating powder is attached by the silane coupling agent, and the soft magnetic alloy powders are bonded to each other so as to be granulated. Then, the mixture is added with a lubricant resin and compression-molded so as to form a green compact. In an annealing process, the mold is annealed in a non-oxidizing atmosphere. |
