Method for making nano-scale grain metal powders having excellent high-frequency characteristic and method for making high-frequency soft magnetic core using the same
US7175717B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 14, 2003 |
| Grant date | Feb 13, 2007 |
| Priority date | — |
| Expiry date | Nov 11, 2024 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB22F2999/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method for making a nano-scale amorphous soft magnetic powders obtained by thermally processing and crystallizing amorphous ribbons produced using a rapid solidification process (RSP) and crushing the same. The amorphous soft magnetic core having an excellent high-frequency characteristic is obtained by performing a preliminary thermal treatment of Fe-based amorphous metal ribbons produced by using RSP to then be converted into nano-scale grain metal ribbons, crushing the metal ribbons to thereby obtain nano-scale grain metal powders, classifying the nano-scale grain metal powders to then be mixed into a distribution of powder particles having an optimal uniform composition, mixing the mixed powder with a binder, and then forming a core, and annealing the formed core to then coat the core with an insulating resin.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.