Powder core and iron-base powder for powder core
US8236087B2 · kind B2 · utility
3Cited by
2References
8Claims
0Family size
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Key dates
| Filing date | Sep 11, 2007 |
| Grant date | Aug 7, 2012 |
| Priority date | — |
| Expiry date | Oct 26, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/12056
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The present invention relates to an iron-base powder for a powder core, wherein when cross-sections of at least 50 iron-base powders are observed and a crystal grain size distribution containing at least a maximum crystal grain size is determined by measuring a crystal grain size of each iron-base powder, 70% or more of the measured crystal grains are a crystal grain having a crystal grain size of 50 μm or more. According to the iron-base powder of the invention, a coercivity of the powder core can be made small and a hysteresis loss can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.