TWI456598B - Manganese-zinc ferrite powder with high resistivity coefficient and method for manufacturing manganese-zinc ferrite core - Google Patents

Claims (10)

A high-resistance manganese-zinc ferrite powder comprising: a main component, wherein the main component comprises: from 48 mol% to 49.5 mol% of ferric oxide; manganese oxide; And zinc oxide, wherein a ratio of the molar percentage of the manganese oxide to the molar percentage of the zinc oxide is 1.05 to 2.3, and the sum of the ferric oxide, the manganese oxide and the molar percentage of the zinc oxide is 100 mol% And a component comprising 100% by weight of the total weight of the main component, the secondary component comprising: 0.02 wt% to 0.05 wt% of calcium oxide; 0.005 wt% to 0.01 wt% of cerium oxide; 0.1 wt% To 0.5 wt% of cobalt oxide; 0 wt% to 0.05 wt% of titanium dioxide; 0 wt% to 0.01 wt% of antimony trioxide; and 0 wt% to 0.02 wt% of molybdenum trioxide. The high-resistance MnZn ferromagnetic powder according to claim 1, wherein the main component comprises 49 mol% of the ferric oxide, and the molar percentage of the manganese oxide is 100 mol% of the total molar percentage of the main component. The ratio of the percentage of moles of the zinc oxide is 2; and the by-component comprises 0.03 wt% of the calcium oxide, 0.005 wt% of the ceria, and 0.5 of the cobalt oxide, based on 100 wt% of the total weight of the main component. Wt%, and the antimony trioxide is 0.01 wt%. The high-resistance manganese-zinc ferrite powder according to claim 1, wherein the main component comprises 48.5 mol% of the ferric oxide based on a total molar percentage of the main component of 100 mol%, the manganese oxide a ratio of the percentage to the percentage of moles of the zinc oxide; and the by-component comprises 0.05% by weight of the calcium oxide, 0.005% by weight of the cerium oxide, and the cobalt oxide, based on 100% by weight of the total weight of the main component 0.1 wt%, and the titanium dioxide 0.05 wt%. The high-resistance MnZn ferromagnetic powder according to claim 1, wherein the main component comprises 49 mol% of the ferric oxide, and the molar percentage of the manganese oxide is 100 mol% of the total molar percentage of the main component. The ratio of the percentage of moles of the zinc oxide is 2.3; and the by-component comprises 0.05% by weight of the calcium oxide, 0.005% by weight of the cerium oxide, and 0.5% by weight based on 100% by weight of the total weight of the main component. Wt%, and the molybdenum trioxide 0.02 wt%. The high-resistance MnZn ferromagnetic powder according to claim 1, wherein the main component comprises 49 mol% of the ferric oxide, and the molar percentage of the manganese oxide is 100 mol% of the total molar percentage of the main component. The ratio of the percentage of moles of the zinc oxide is 2.3; and the by-component comprises 0.05% by weight of the calcium oxide, 0.005% by weight of the cerium oxide, and 0.1% by weight of the total weight percent of the main component. Wt%, the antimony trioxide 0.01 wt%, and the molybdenum trioxide 0.02 wt%. A method for manufacturing a high resistivity manganese-zinc ferrite magnetic core, comprising: providing a principal component, wherein a percentage of total moles of the principal component is 100 mol%, the main component comprises: 48 mol% to 49.5 mol% of ferric oxide; manganese oxide; and zinc oxide, wherein the ratio of the molar percentage of the manganese oxide to the molar percentage of the zinc oxide is 1.05 to 2.3 And the sum of the percentages of the molars of ferric oxide, manganese oxide and zinc oxide is 100 mol%; the main component is subjected to a calcining treatment; a component is added to the main component to form a mixture, wherein The total weight percentage of the main component is 100% by weight, and the auxiliary component comprises: 0.02% by weight to 0.05% by weight of calcium oxide; 0.005% by weight to 0.01% by weight of cerium oxide; 0.1% by weight to 0.5% by weight of cobalt oxide; 0 wt% to 0.05 wt% of titanium dioxide; 0 wt% to 0.01 wt% of antimony trioxide; and 0 wt% to 0.02 wt% of molybdenum trioxide; and a wet grinding step of the mixture to form a plurality of particles; A plurality of particles are used to form a green embryo; the raw embryo is subjected to a sintering treatment. The method for producing a high-resistance MnZn ferrite core according to claim 6, wherein the temperature of the sinter treatment is 900 °C. The method for producing a high-resistance Mn-Zn ferrite core according to claim 6, wherein the wet-grinding step comprises adding a binder to the mixture, and after the wet-grinding step, the high-resistance manganese The method for producing zinc ferrite magnetic core further comprises performing a granulation treatment. A method for producing a high-resistance Mn-Zn ferrite core according to claim 6, wherein each of the particles has a particle diameter of from 80 μm to 240 μm. The method for manufacturing a high-resistance Mn-Zn ferrite core according to claim 6, wherein the sintering treatment is carried out in a case where the process atmosphere is air: at a temperature increase rate of 100 ° C / hour, a process temperature is raised from a normal temperature. Up to 500 ° C; at a heating rate of 200 ° C / hour, the process temperature is raised to 900 ° C; at a heating rate of 250 ° C / hour, the process temperature is raised to 1220 ° C, and then held for 2 hours; 200 ° C / The cooling rate of the hour reduced the process temperature to 1100 ° C; and the process temperature was lowered to room temperature at a cooling rate of 240 ° C / hour.