Soft magnetic metallic glass alloy
|Posted date||Aug 29, 2011|
|Country||United States of America|
|Date of filing||Feb 27, 2003|
|Gazette Date||Jul 28, 2005|
|Gazette Date||Apr 15, 2008|
|International application number||JP2003002257|
|International publication number||WO2003074749|
|Date of international filing||Feb 27, 2003|
|Date of international publication||Sep 12, 2003|
|Title||Soft magnetic metallic glass alloy|
Disclosed is a soft magnetic Fe-B-Si-based metallic glass alloy with high glass forming ability which has a supercooled-liquid temperature interval (DeltaTchi) of 40 K or more, a reduced glass-transition temperature (Tg/Tm) of 0.56 or more and a saturation magnetization of 1.4 T or more.
The metallic glass alloy is represented by the following composition formula: (Fe1-a-bBaSib)100-chiMchi, wherein a and b represent an atomic ratio, and satisfy the following relations: 0.1<=a<=0.17, 0.06<=b<=0.15 and 0.18<=a+b<=0.3, M is one or more elements selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti, V, Cr, Pd and W, and chi satisfies the following relation: 1 atomic % <=chi<=10 atomic %.
The present invention overcomes restrictions in preparing a metallic glass bar with a thickness of 1 mm or more from conventional Fe-B-Si-based metallic glasses due to their poor glass forming ability, and provides a high saturation-magnetization Fe-B-Si-based metallic glass allowing the formation of bulk metallic glass, which serves as a key technology for achieving a broader application fields of metallic glass products.
|Scope of claims||
1. A soft magnetic Fe -- B -- Si-based metallic glass alloy product comprising metallic glass alloy being represented by the following composition formula:
(Fe1-a-bBaSib)100-chi Mchi ,wherein a and b represent an atomic ratio, and satisfy the following relations: 0.125 <= a <= 0.17, 0.10 <= b <= 0.15 and 0.225 <= a+b <= 0.3 M is one or more elements selected from the group consisting of Zr, Nb, Ta, Hf, Mo, Ti, V, Cr.
Pd and W, andchi satisfies the following relation: 1 atomic % <= chi <= 10 atomic %.wherein said metallic glass alloy has a supercooled-liquid temperature interval (DELTA Tchi ) of 40 K or more, a reduced glass-transition temperature (Tg/Tm) of 0.56 or more,said glass alloy product as cast has minimum thickness or diameter of 0.5 mm or more, and a volume fraction (Vf-amo) of a glass phase is 100%, anda saturation magnetization of more than 1.4 T and coercive force of 3.7A/m or less.
2. The soft magnetic Fe -- B -- Si-based metallic glass alloy as defined in claim 1, which contains 3 atomic % or less of one or more elements selected from the group consisting of P, C, Ga and Ge.
|IPC(International Patent Classification)|
|Reference ( R and D project )||ERATO INOUE Superliquid Class AREA|
Contact Information for " Soft magnetic metallic glass alloy "
- Japan Science and Technology Agency Department of Intellectual Property Management
- URL: http://www.jst.go.jp/chizai/
- Address: 5-3, Yonbancho, Chiyoda-ku, Tokyo, Japan , 102-8666
- Fax: 81-3-5214-8476