Spherical ferrite particles in nano-size and method of manufacturing same
AssigneePowdertech Co., Ltd.
InventorsKoji Aga, Tetsuya Igarashi
Life of this patent
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Abstract
An object is to provide the ferrite particles used as a magnetic filler or a raw material for a molded product excellent in dispersibility as a powder and excellent in uniformity after molding and result the surface with small unevenness; and a method of manufacturing the particles. To achieve the object, Mn—Mg ferrite particles having an average particle size of 1 to 2000 nm and having a spherical shape are employed. It is preferable that the ferrite particles are produced by a method including subjecting of a ferrite raw material obtained through preparation of a ferrite composition to flame-spraying in air for ferritization followed by rapid cooling for solidifying of the ferrite.
Claims6
A manganese-magnesium ferrite particle comprising:
- from 13 to 25% by weight manganese,
- from 1 to 3.5% by weight magnesium, and from 43 to 57% by weight iron, as the manganese-magnesium ferrite;
- the particle having an average particle size of 1 to 2000 nm and a spherical shape;
- and
- the particle being surface-treated with an aluminum-compound.
A particle comprising a manganese-magnesium ferrite;
- the particle having an average particle size of 1 to 2000 nm and a spherical shape;
- and the particle being surface-treated with an aluminum compound.
A method of manufacturing a manganese-magnesium ferrite particle having an average particle size of 1 to 2000 nm and a spherical shape;
- the method comprising flame spraying in air a raw material particle comprising an iron material, a manganese material, and a magnesium material to obtain a non-solid manganese-magnesium ferrite and rapidly cooling the non-solid manganese-magnesium ferrite to obtain the magnesium-manganese ferrite particle.
Dependencies are inferred from the claim text.