Process of fabricating a manganese-zinc-ferrite core, and manganese zinc-base ferrite core
US6309558A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 25, 2000 |
| Grant date | Oct 30, 2001 |
| Priority date | — |
| Expiry date | Jul 25, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B35/2658
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention provides manganese-zinc-ferrite core fabrication process which can fabricate a manganese-zinc-ferrite core having high surface electrical resistance and low magnetic core losses without recourse to the introduction of nitrogen gas from the outside yet within a short time period, and such a manganese-zinc-ferrite core. To achieve this, manganese-zinc-ferrite core is formed into a given core shape. The core compact is fired in a firing atmosphere having an oxygen concentration controlled with carbonic acid gas and steam. Then, the compact is rapidly cooled at a cooling rate of 350.degree. C./hour to 850.degree. C./hour. In this way, a manganese-zinc-ferrite core is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.