Claims
- 1. A method of producing magnetic soft ferrite expressed by the general formula: M.sub.x Zn.sub.1-x O Fe.sub.2 O.sub.3 wherein M represents one or more of the materials selected from Cu, Mn, Ni, Fe, Co and Mg; and X is in the composition range of 0.4-0.7, by melting and casting, comprising the processes of heating a material consisting of the compound with the above formula or a mixture of the component oxides corresponding to the above composition to a temperature of 1500.degree.-1900.degree. C. to melt; while disposing a Zn supply source consisting of Zn or a Zn compound around the above mentioned material to allow existence of a surrounding gas containing Zn so as to suppress evaporation of Zn in the molten material, the surrounding gas containing Zn being at a pressure of 1-3.1 kg/cm.sup.2 ; and solidifying the melt by casting the melt into a mold having a desired shape preheated to a temperature of 200.degree.-800.degree. C. and cooling under a cooling rate of 300.degree.-1800.degree. C./hr.
- 2. A method of producing magnetic soft ferrite according to claim 1, wherein the surrounding gas containing Zn includes a gas selected from air, argon, nitrogen and a mixture of two or more of these gases.
- 3. A method of producing magnetic soft ferrite according to claim 1, wherein the surrounding gas is at a pressure of about 1 to 2 kg/cm.sup.2.
Parent Case Info
This application is a continuation-in-part of application Ser. No. 08/017,987, filed Feb. 16, 1993; now abandoned, which is a continuation of application Ser. No. 07/902,495, filed Jun. 23, 1992, now abandoned, which is a continuation of application Ser. No. 07/763,692, filed Sep. 23, 1991, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
3546122 |
Nishizawa et al. |
Dec 1970 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
532788 |
Mar 1993 |
EPX |
52-45094 |
Apr 1977 |
JPX |
2-135711 |
May 1990 |
JPX |
4-44303 |
Feb 1992 |
JPX |
Non-Patent Literature Citations (2)
Entry |
Sugimoto, "Ferrites, Proc. Int. Conf.", 1970 (Pub. 1971), University Park Press, Baltimore, Md. no month. |
Sugimoto et al., "Ferrites, Proc. Int. Conf.", 1970 (Pub. 1971), University Park Press, Baltimore, Md. no month. |
Continuations (2)
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Number |
Date |
Country |
Parent |
902495 |
Jun 1992 |
|
Parent |
763692 |
Sep 1991 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
17987 |
Feb 1993 |
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