Low temperature sintering radio frequency soft ferrite material, and method for manufacturing a wire coiling inductor core using such material

A method for manufacturing a wire coiling inductor core, comprising the steps of:

• adding 1-25 wt % of B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 --ZnO glass to a raw material composed of in mole %:
• 40.0-51.0% of Fe.sub.2 O.sub.3, 1.0-10.0% of CuO, 38.0-48.0% of NiO, and 1.0-10.0% of ZnO, and crushing and drying them to form a dried powder;
• mixing said dried powder with 5-15 wt % of a binder with 5-10 wt % of a main agent and 5-16 wt % of a reaction inhibiting agent contained 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 radio frequency chip inductor, comprising the steps of:

• adding 1-25 wt % of B.sub.2 O.sub.3 --Bi.sub.2 O.sub.3 --ZnO glass to a raw material composed of in mole %:
• 40.0-51.0% of Fe.sub.2 O.sub.3, 1.0-10.0% of CuO, 38.0-48.0% of NiO, and 1.0-10.0% of ZnO, 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 said green sheets, and sintering the resulting body at a temperature of 860.degree.-910.degree. C.;
• and
• forming an outer electrode on the sintered body.