MAGNET POWDER AND MANUFACTURE THEREOF

Japanese Patent JP3262109

B2

PROBLEM TO BE SOLVED: To enhance both saturation magnetization and coersive force by using a ferrite having a hexagonal structure represented by specified SrO, lanthanum- oxide, iron-sesquioxide, titanium-oxide, ZrO, CoO as a main phase.
SOLUTION: Powders of SrCO3 and of Fe2O3 are mixed, wherein La2O3, TiO2, ZrO and CoO or the likes are added to the material powder. The mixed material powder is heated at a temperature of 1100-1450°C to obtain a ferrite compound (calcine) by a solid phase reaction. This calcined body represented by (1-x)SrO.(x/2)La2O3.(n-y/2-y/2-y")Fe2O3.yTiO2.y'ZnO.y"CoO, (x,y,y' and y" are mol ratios; 0.1≤x≤0.3, 0.01≤y≤0.3, 0≤y'≤0.3, 0.1≤y"≤0.4, 5.5≤n≤6.5), has a hexagonal structure of a magnetoplumbite ferrite as a main phase. Magnet powder is obtained by pulverizing the calcined body.

JP3106413	OXIDE MAGNETIC MATERIAL AND MANUFACTURE THEREOF
JPS5814047	[Title of the Invention] A manufacturing method of a magnetic recording material

Seiichi Hosokawa
Yukio Toyoda

JP28716999A

March 04, 2002

August 31, 1999

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Sumitomo Special Metal Co., Ltd.

H01F1/11; C01G49/00; C04B35/26; C04B35/40; H01F1/113; (IPC1-7): H01F1/11; C01G49/00; C04B35/40

JP10149910A

Seiji Okuda

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