Reference

Manufacture of magnetoplumbite-type ferrite powder

Manufacture of magnetoplumbite-type ferrite powder. Ozaki, Yoshiharu; Wadasako, Mitsuyuki; Shinohara, Yoshinori (Mitsubishi Mining and Cement Co., Ltd., Japan). Jpn. Kokai Tokkyo Koho JP 61261217 A2 19 Nov 1986 Showa, 3 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: C01G049-00. ICS: H01F001-11. APPLICATION: JP 85-102689 16 May 1985. DOCUMENT TYPE: Patent CA Section: 77 (Magnetic Phenomena) Fe(II) alkoxide is hydrolyzed with a bivalent metal [excluding Fe(II)] alkoxide(s), then oxidized, and calcined to give a magnetoplumbite-type ferrite powder. A homogeneous magnetoplumbite fine powder is obtained. FeCl2 and BaCl2 were dissolved in dehydrated EtOH, Na was added, and refluxed 1 h at 70° to give Fe(OEt)2 and Ba(OEt)2. Decarbonated H2O was added dropwise to the ethoxides to give a ppt.-contg. suspension, air was bubbled in for oxidn. of the ppt., and the ppt. was dried 1 h at 70° to give an amorphous powder, which was calcined at 700° to give BaFe12O19.Except for chemicals metioned above, 12023-91-5 and 12047-11-9 are also used. .

Manufacture of isotropic ferrite magnets

Manufacture of isotropic ferrite magnets. Shimazaki, Mitsumasa (Tone Industry Co., Ltd., Japan). 12047-11-9 and 12023-91-5 are also occured in this study. Jpn. Kokai Tokkyo Koho JP 61280601 A2 11 Dec 1986 Showa, 2 pp. (Japan) CODEN: JKXXAF. CLASS: ICM: H01F001-113. ICS: C01G049-00. APPLICATION: JP 85-121585 6 Jun 1985. DOCUMENT TYPE: Patent CA Section: 77 (Magnetic Phenomena) In manufg. a MO.6Fe2O3 (M = Ba and/or Sr) isotropic ferrite, pulverization, following calcination, is entirely or partially carried out under wet conditions. The method gives easier control of magnetic characteristics and wider use of raw material Fe oxide than conventional methods. Fe oxide and BaCO3 were mixed and calcined at 1150° to give a clinker, the clinker was roughly ground, then finely ground to a particle size of 1.1. m, dried, pelletized, press-formed, and sintered to give a test piece having a residual magnetic flux d. of 2200 G, normal coercivity 1700 Oe, and intrinsic coercivity 3100 Oe. .