Method for manufacturing a coil-type electronic component

摘要

A coil-type electronic component has a coil inside or on the surface of its base material and is characterized in that: the base material is constituted by a group of grains of a soft magnetic alloy containing iron, silicon and other element that oxidizes more easily than iron; the surface of each soft magnetic alloy grain has an oxide layer formed on its surface as a result of oxidization of the grain; this oxide layer contains the other element that oxidizes more easily than iron by a quantity larger than that in the soft magnetic alloy grain; and grains are bonded with one another via this oxide layer.

主权项

1. A method for manufacturing a coil-type electronic component having a coil provided in or around its base material, comprising:
providing soft magnetic alloy grains having no oxide layer on their surfaces formed by oxidation greater than natural oxidation of the grains, said soft magnetic alloy grains containing iron, silicon and another element that oxidizes more easily than iron; pressing a mixture of binder and soft magnetic alloy grains to obtain a molded product; heat-treating the molded product in an oxidizing atmosphere containing oxygen to oxidize surfaces of the soft magnetic alloy grains so as to form an oxide layer on the surfaces of the soft magnetic alloy grains and bond the soft magnetic alloy grains with one another via the oxide layer, thereby obtaining a base material, wherein the oxide layer contains the other element that oxidizes more easily than iron in a quantity larger than that in the soft magnetic alloy grains; and providing a coil in or around the base material and electrodes extending from the base material, wherein the oxide layer is a film covering the surface of the grains and has a partially discontinued portion on the surface.