| 摘要 |
PROBLEM TO BE SOLVED: To obtain a high initial permeability and a small temperature coefficient by a method wherein Ni-Zn-Mg-Cu ferrite is used as the main component, and specific weight of PbO, silicon oxide, niobium oxide and cobalt oxide are contained as a subsidiary component. SOLUTION: The composition of the main component of this oxide magnetic material is Fe2 O3 , NiO, ZnO, MgO and CuO. Co3 O4 of 0.01 to 0.10 wt.%, SiO2 of 0.80 to 1.63 wt.%, Nb2 O5 of 1.4 to 3.0 wt.%, PbO of 2.16 to 3.95 wt.% are added to the main component as subsidiary ingredients. Water is added to the above-mentioned mixture, and after they are mixed, the mixture is calcined. Water is added to the obtained powder, and after crushing by a ball mill, PVA binder is added, granulated, a toroidal core is molded and fired. |
