Preparation of oxide magnetic material
US5951937A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 3, 1997 |
| Grant date | Sep 14, 1999 |
| Priority date | — |
| Expiry date | Dec 3, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01F1/344
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.