US 2021/0241950 A1 · IRON OXIDE MAGNETIC POWDER AND MANUFACTURING METHOD THEREFOR

Abstract

The present invention relates to a method for producing a magnetic powder, including: preparing a precursor solution containing an iron precursor and a silica precursor; spraying the precursor solution to form iron/silica precursor droplets; drying the iron/silica precursor droplets to produce iron/silica precursor particles; and heat treating the iron/silica precursor particles to produce an iron oxide/silica composite powder in which iron oxide particles are embedded in a silica matrix. The present invention also relates to a magnetic powder produced by the method. The present invention may provide an iron oxide magnetic powder that does not use rare earth elements and a method for producing the same.

Claims17

Dependent claims

A magnetic powder, comprising:

a silica matrix;
and
particles of an iron oxide embedded in the silica matrix,
wherein the particles of the iron oxide comprises particles of a hard magnetic iron oxide, and wherein the particles of the hard magnetic iron oxide are ε-Fe2O3.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

17/051,979Filed 17 Jul 2019

Priority

KR 10-2018-008278317 Jul 2018

Published

5 Aug 2021

Term ends

Not estimatedThe source records don’t support an estimate.

Classification19 codes

H01F 1/11
Non-metallic substances, e.g. ferrites , e.g. [O6] ferrites with hexagonal structure: in the form of particles
B22F 1/07
Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties: metallic powder characterised by particles…
B22F 9/08
Starting from liquid material: by casting, e.g. through sieves or in water, by atomising or spraying
C01B 33/12
Silicon oxides; Hydrates thereof: silica; Hydrates thereof, e.g. lepidoic silicic acid

Iron oxide magnetic powder and manufacturing method therefor

Life of this patent

Iron oxide magnetic powder and manufacturing method therefor

Life of this patent

Abstract

Claims17