Ferrimagnetic core materials for megahertz frequency high flux density transformers and inductors
US5626789A · kind A · utility
10Cited by
16References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 11, 1991 |
| Grant date | May 6, 1997 |
| Priority date | — |
| Expiry date | Sep 11, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/2666
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
An improved NiZnCo ferrimagnetic core material which may further contain elements from the group Cr, Mn or Li. The invention permits enhancement of magnetic properties and results in core materials capable of efficient operation at high frequencies on the order of 1-100 MHz over a wide range of magnetic flux densities, on the order of 1-2500 Gauss. The composition of base NiZnCo ferrites are adjusted through ionic substitution. The magnetic properties of the ferrite are further enhanced through Bi.sub.2 O.sub.3 and SiO.sub.2 additions and controlled sintering. Methods of manufacturing the core material are also disclosed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.