Taiyo Yuden Co., Ltd.

Kazuki Misawa

Shinsuke Takeoka

Kinshiro Takadate

Takashi Nakajima

A magnetic base body is constituted by: metal magnetic grains containing Fe, and Si as an optional component, where the total content of the Fe and Si is 99% by mass or higher; and oxide layers present between the metal magnetic grains; wherein the ratio (I/I) of the strongest diffraction line intensity (I) observed in a range of 30.8°≤2θ≤32.2° to the strongest diffraction line intensity (I) observed in a range of 43.8°≤2θ≤45.2° in X-ray diffraction measurement using the CuKα ray is 0.0020 or higher; and the ratio (I/I) of the strongest diffraction line intensity (I) observed in a range of 33.0°≤2θ≤34.4° to the Iin X-ray diffraction measurement using the CuKα ray is lower than 0.0010.

Magnetic base body, coil component, and circuit board

A method for manufacturing a coil component includes: providing multiple metal magnetic grains; preparing a magnetic body paste by mixing the multiple metal magnetic grains, a binder resin containing a resinate having at least one element selected from the group consisting of Si, Al, Cr, Mg, Ti, and Zr, and a solvent; forming a compact using the magnetic body paste; heat-treating the compact to form, on surfaces of the metal magnetic grains, bonding parts constituted by an amorphous oxide containing carbon and the at least one element, thereby forming a magnetic base body wherein the multiple metal magnetic grains are bonded via the bonding parts; forming a coil that includes a metal conductor; and forming external electrodes on surfaces of the magnetic base body and connecting end parts of the coil to the external electrodes, respectively.

Method for manufacturing coil component with magnetic base body formed using metal magnetic grains and resinate

A magnetic base body comprises multiple metal magnetic grains and bonding parts for bonding the multiple metal magnetic grains, wherein the bonding parts are constituted by an amorphous mixture containing carbon and an oxide of at least one element selected from silicon, aluminum, chromium, magnesium, titanium, and zirconium. A coil component using the magnetic base body can improve mechanical strength while ensuring insulation reliability.

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Takasaki, Japan

Kazuki Misawa