| 摘要 |
PROBLEM TO BE SOLVED: To provide a ferrite material having high positive magnetostriction, high magnetic permeability and low temp. characteristics by adding SiO2 and TiO2 to a principal compsn. consisting of Fe2 O3 , ZnO and NiO. SOLUTION: A principal compsn. (expressed in terms of oxides) is prepd. by mixing 50-65mol% Fe2 O3 with 25-40mol% ZnO and 5-20mol% NiO so that the molar ratio of ZnO to NiO is regulated to 2-3 and 0.5-5 pts.wt. SiO2 , 0.1-3 pts.wt. TiO2 , <=1 pt.wt. CuO, <=1 pt.wt. Bi2 O3 , <=0.15 pt.wt. MnO <=0.05 pt.wt. Al2 O3 , <=0.05 pt.wt. MgO, <=0.05 pt.wt. CaO, <=0.05 pt.wt. K2 O and <=0.05 pt.wt. S are added to 100 pts.wt. of the principal compsn. They are pulverized, mixed and calcined at 800-900 deg.C. The resultant calcined powder is mixed with a binder, granulated, compacted in a prescribed shape and fired at 950-1,250 deg.C to obtain the objective ferrite material. |
