Preparation of oxide magnetic material

Details Preparation of oxide magnetic material Preparation of oxide magnetic material

1997-12-03

1999-09-14

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Direct application of electrical or wave energy to work

Producing or treating magnetic product precursor thereof

252 6257, 252 6262, 252 6263, 264428, 264611, H01F 110, B28B 300

Patent

active

059519371

ABSTRACT:
The method of the invention uses a molding slurry containing a particulate oxide magnetic material and water and having a dispersant added thereto. The dispersant is an organic compound having a hydroxyl group and a carboxyl group or a neutralized salt thereof or a lactone thereof, an organic compound having a hydroxymethylcarbonyl group, or an organic compound having an enol form hydroxyl group dissociable as an acid or a neutralized salt thereof. The organic compound has 3 to 20 carbon atoms, with the hydroxyl group being attached to at least 50% of carbon atoms other than the carbon atom forming a double bond with an oxygen atom. Citric acid or a neutralized salt thereof is also useful as the dispersant. The addition of the dispersant facilitates the wetting of the particulate oxide magnetic material with water and improves the dispersion of primary particles and a degree of orientation upon molding.

REFERENCES:
patent: 5164173 (1992-11-01), Muller
patent: 5607615 (1997-03-01), Taguchi et al.
patent: 5648039 (1997-07-01), Taguchi et al.
patent: 5811024 (1998-09-01), Taguchi et al.
patent: 5846449 (1998-12-01), Taguchi et al.
Saito, "Molding of Fine Ceramics and Organic Materials," Aug. 26, 1985, pp. 186-191.
Moriyama, "Chemistry of Dispersion and Agglomeration," Jul. 20, 1995, pp. 92-95.

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