Soft ferrite material for use in making inductors, and method for manufacturing inductors using the material
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorChang Sik Kim
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Abstract
A soft ferrite material for manufacturing a device for shielding electromagnetic frequencies such as wire coiling inductors and chip components including chip inductors and chip beads is disclosed. Particularly, an Ni--Cu--An soft ferrite material and a method for manufacturing a wire coiling type or chip type inductor using the ferrite material are disclosed, in which a low temperature sintering is possible, the variations of the electromagnetic properties are low as against an external stress, and the electromagnetic properties are superior. A B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 --ZnO glass is added in an amount of 0.05-15.0 wt % to the ordinary Ni--Cu--Zn soft raw material, and this mixture is sintered at a temperature of 860.degree.-910.degree. C.
Claims23
An Ni--Cu--Zn soft ferrite material for making inductors, comprising a raw material composed of (in mole %):
- 49.0-50.0% of Fe.sub.2 O.sub.3, 5-13% of CuO, 7.5-25% of NiO, and 12-38.5% of ZnO, and
- the soft ferrite material further comprising in weight %:
- 0.05-15.0% of B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 --ZnO glass.
A method for manufacturing a wire coiling inductor core, comprising the steps of:
- adding 0.05-15.0 wt % of B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 --ZnO glass to a raw material composed of (in mole %):
- 49.0-50.0% of Fe.sub.2 O.sub.3, 5-13% of CuO, 7.5-25% of NiO, and 12-38.5% of ZnO, adding a liquid component and crushing and drying them to form a dried powder;
- mixing said dried powder with 5-15 wt % of a binder containing 5-10 wt % of a main agent and 5-16 wt % of a reaction inhibiting agent therein, to form a mixture, and making coarse particles from the mixture;
- and
- forming the coarse particles, and sintering the resulting body at a temperature of 860.degree.-910.degree. C.
A method for manufacturing a chip inductor, comprising the steps of:
- adding 0.05-15.0 wt % of B.sub.2 O.sub.3 --Bi.sub.2 --O.sub.3 --ZnO glass to a raw material composed of (in mole %):
- 49.0-50.0% of Fe.sub.2 O.sub.3, 5-13% of CuO, 7.5-25% of NiO, and 12-38.5% of ZnO, adding a liquid component and crushing and drying them to form a dried powder;
- adding a binder to the dried powder at a ratio of 1:1-1:4, and casting a plurality of green sheets using a doctor blade process;
- stacking a plurality of said green sheets, printing an inner Ag electrode upon the stacked sheets, stacking again a plurality of green sheets, and sintering the resulting body;
- and
- forming an outer electrode on the sintered body.
Dependencies are inferred from the claim text.