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Soft magnetic metallic glass alloy

Foreign code F110005293
File No. E05109US
Posted date Aug 29, 2011
Country United States of America
Application number 50616803
Gazette No. 20050161122
Gazette No. 7357844
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
Priority data
  • P2002-055291 (Mar 1, 2002) JP
  • 2003WO-JP02257 (Feb 27, 2003) WO
Title Soft magnetic metallic glass alloy
Abstract (US7357844)
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 [claim1]
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.
[claim2]
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.
  • Inventor, and Inventor/Applicant
  • INOUE AKIHISA
  • JAPAN SCIENCE AND TECHNOLOGY AGENCY
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • 148/304
  • 148/403
Reference ( R and D project ) (In Japanese)ERATO INOUE Superliquid Class AREA
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