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METHOD FOR MANUFACTURING MANGANESE ZINC-BASED FERRITE POWDER
To provide MnZn-based ferrite powder useful in a high-frequency region.SOLUTION: A method for manufacturing MnZn-based ferrite powder containing, as primary components, Fe of 53-56 mol% and Zn of 3-9 mol% with the balance consisting of Mn, and as a sub-component, Co of 0.05-0.4 pt.mass comprises: a preliminary baking step of mixing powder of raw materials of MnZn-based ferrite and then, preliminary baking the resultant powder mixture at a temperature of 800-1000°C to obtain preliminary baked powder; a granulating step of using the preliminary baked powder to obtain spherical granulated powder; a sintering step of sintering the granulated powder at a temperature of over 1050°C and under 1150°C and then, cooling the sintered powder to a temperature under 150°C to obtain spherical MnZn-based ferrite powder; and a thermal treatment step of performing a thermal treatment on the MnZn-based ferrite powder. In the thermal treatment step, the MnZn-based ferrite powder is heated to a temperature which satisfies the conditions of being 200°C or higher, and falling in a range of (Tc-90)°C to (Tc+100)°C, and retained at the temperature for a fixed length of time, and the temperature is then lowered at a rate of 50°C/hr or more slowly from the retention temperature.SELECTED DRAWING: Figure 3
【課題】高周波数領域において有用な、ＭｎＺｎ系フェライト粉を提供する。【解決手段】５３〜５６モル％のＦｅ、３〜９モル％のＺｎ及び残部Ｍｎを主成分とし、０．０５〜０．４質量部のＣｏを副成分として含むＭｎＺｎ系フェライト粉の製造方法であって、ＭｎＺｎ系フェライトの原料粉末を混合した後、混合粉を８００℃〜１０００℃で仮焼して仮焼粉を得る仮焼工程と、前記仮焼粉を用いて球状の造粒粉を得る造粒工程と、前記造粒粉を１０５０℃超１１５０℃未満で焼結し、１５０℃未満の温度まで冷却して球状のＭｎＺｎ系フェライト粉を得る焼結工程と、前記ＭｎＺｎ系フェライト粉を熱処理する熱処理工程と、を備える。熱処理工程では、２００℃以上及び（Ｔｃ−９０）℃〜（Ｔｃ＋１００）℃を満たす温度まで加熱し、一定時間保持した後、保持温度から５０℃／時間以下の速度で降温する。【選択図】図３
METHOD FOR MANUFACTURING MANGANESE ZINC-BASED FERRITE POWDER
To provide MnZn-based ferrite powder useful in a high-frequency region.SOLUTION: A method for manufacturing MnZn-based ferrite powder containing, as primary components, Fe of 53-56 mol% and Zn of 3-9 mol% with the balance consisting of Mn, and as a sub-component, Co of 0.05-0.4 pt.mass comprises: a preliminary baking step of mixing powder of raw materials of MnZn-based ferrite and then, preliminary baking the resultant powder mixture at a temperature of 800-1000°C to obtain preliminary baked powder; a granulating step of using the preliminary baked powder to obtain spherical granulated powder; a sintering step of sintering the granulated powder at a temperature of over 1050°C and under 1150°C and then, cooling the sintered powder to a temperature under 150°C to obtain spherical MnZn-based ferrite powder; and a thermal treatment step of performing a thermal treatment on the MnZn-based ferrite powder. In the thermal treatment step, the MnZn-based ferrite powder is heated to a temperature which satisfies the conditions of being 200°C or higher, and falling in a range of (Tc-90)°C to (Tc+100)°C, and retained at the temperature for a fixed length of time, and the temperature is then lowered at a rate of 50°C/hr or more slowly from the retention temperature.SELECTED DRAWING: Figure 3
【課題】高周波数領域において有用な、ＭｎＺｎ系フェライト粉を提供する。【解決手段】５３〜５６モル％のＦｅ、３〜９モル％のＺｎ及び残部Ｍｎを主成分とし、０．０５〜０．４質量部のＣｏを副成分として含むＭｎＺｎ系フェライト粉の製造方法であって、ＭｎＺｎ系フェライトの原料粉末を混合した後、混合粉を８００℃〜１０００℃で仮焼して仮焼粉を得る仮焼工程と、前記仮焼粉を用いて球状の造粒粉を得る造粒工程と、前記造粒粉を１０５０℃超１１５０℃未満で焼結し、１５０℃未満の温度まで冷却して球状のＭｎＺｎ系フェライト粉を得る焼結工程と、前記ＭｎＺｎ系フェライト粉を熱処理する熱処理工程と、を備える。熱処理工程では、２００℃以上及び（Ｔｃ−９０）℃〜（Ｔｃ＋１００）℃を満たす温度まで加熱し、一定時間保持した後、保持温度から５０℃／時間以下の速度で降温する。【選択図】図３
METHOD FOR MANUFACTURING MANGANESE ZINC-BASED FERRITE POWDER
ＭｎＺｎ系フェライト粉の製造方法
KADOWAKI MAKOTO (author) / KOYUHARA TOKUKAZU (author)
2020-12-17
Patent
Electronic Resource
Japanese
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