Composite sintered magnetic material, its manufacturing method, and magnetic element using composite sintered magnetic material
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTakeshi Takahashi, Nobuya Matsutani, Kazuaki Onishi
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Abstract
A composite sintered magnetic material comprises a kind of metal powder at least one selected from the group consisting of Fe, Fe—Si type, Fe—Ni type, Fe—Ni—Mo type, and Fe—Si—Al type, and a ferrite layer formed from a kind of ferrite powder at least one selected from the group consisting of Ni—Zn type, Mn—Zn type, and Mg—Zn type, wherein a diffusion layer is formed by sintering between both of these to integrates the both.
Claims12
A manufacturing method for a composite sintered magnetic material, the method comprising the steps of:
- measuring predetermined amounts of a metal powder selected from the group consisting of Fe, Fe—Si type, Fe—Ni type, Fe—Ni—Mo type, and Fe—Si—Al type, and at least one ferrite selected from the group consisting of Ni—Zn type, Mn—Zn type, and Mg—Zn type;
- mixing and dispersing the metal powder and the ferrite to form a mixture;
- and
- compacting the mixture under pressure into a compact of predetermined shape,
- sintering the compact in a non-oxidative atmosphere, and forming a diffusion layer around the metal powder, in which the diffusion layer bonds the metal powder and the ferrite, and
- heat treating the sintered compact in an oxygen containing atmosphere, in which the ferrite becomes at least 90% or more spinel phase;
- wherein the oxygen containing atmosphere is from 2% oxygen to 20% oxygen.
A manufacturing method for a composite sintered magnetic material, the method comprising the steps of:
- forming a ferrite selected from the group consisting of Ni—Zn type, Mn—Zn type, and Mg—Zn type on the surface of metal powder, the metal powder selected from the group consisting of Fe, Fe—Si type, Fe—Ni type, Fe—Ni—Mo type, and Fe—Si—Al type;
- and
- compacting the metal powder and ferrite under pressure into a compact of predetermined shape,
- sintering the compact in a non-oxidative atmosphere, and forming a diffusion layer around the metal powder, in which the diffusion layer bonds the metal powder and the ferrite, and
- heat treating the sintered compact in an oxygen containing atmosphere, in which the ferrite becomes at least 90% or more spinel phase;
- wherein the oxygen containing atmosphere is from 2% oxygen to 20% oxygen.
Dependencies are inferred from the claim text.