Grain oriented electromagnetic steel sheet exhibiting extremely small watt loss and method for producing the same
US6758915B2 · kind B2 · utility
0Cited by
7References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 5, 2002 |
| Grant date | Jul 6, 2004 |
| Priority date | — |
| Expiry date | Dec 5, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C14/08
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
The invention is a grain-oriented magnetic steel sheet having extremely low iron loss, suitable for use as an iron core material for transformers and power generators, and a method for producing the same. The method includes forming a coating layer on a surface of a steel sheet having a thickness of 0.27 mm or less by vapor deposition in a low oxidizing atmosphere with an oxygen partial pressure (Po2) of less than 0.1 atm and a total pressure of 0.1 atm or more. The steel sheet has extremely low iron loss with a thickness of 0.27 mm or less and includes a coating layer formed by vapor deposition on a matrix surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.