Fe-based amorphous alloy ribbon and magnetic core formed thereby

Abstract

A magnetic core provided with a shape for a transformer by a cut-lap or step-lap method, which is constituted by an Fe-based amorphous alloy ribbon having excellent magnetic characteristics, which is represented by the general formula: Fe a Si b B c M x or Fe a Si b B c C d M x wherein M is Cr and/or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, x is 0.01 to 5 atomic %, and d is 0.001 to 4 atomic %, (a+b+c+x) or (a+b+c+d+x) being 100.

1 . An Fe-based amorphous alloy ribbon having excellent magnetic characteristics, which is represented by the general formula: Fe a Si b B c M x , wherein M is Cr and/or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, and x is 0.01 to 5 atomic %, (a+b+c+x) being 100.  
     
     
         2 . The Fe-based amorphous alloy ribbon according to  claim 1 , having a saturation magnetic flux density of 1.6 T or more, and a magnetic flux density of 1.5 T or more in a magnetic field of 80 A/m.  
     
     
         3 . The Fe-based amorphous alloy ribbon according to  claim 1 , wherein a is 78 to 85 atomic %, b is 0.001 to 3 atomic %, c is 10 to 20 atomic %, and x is 0.02 to 4 atomic %, and wherein said alloy ribbon has a saturation magnetic flux density of 1.65 T or more, and a magnetic flux density of 1.6 T or more in a magnetic field of 80 A/m.  
     
     
         4 . The Fe-based amorphous alloy ribbon according to  claim 1 , wherein said M is Cr, and x is 0.01 to 1 atomic %.  
     
     
         5 . The Fe-based amorphous alloy ribbon according to  claim 1 , wherein said M is Ni, and x is 0.1 to S atomic %.  
     
     
         6 . An Fe-based amorphous alloy ribbon having excellent magnetic characteristics, which is represented by the general formula: Fe a Si b B c C d M x , wherein M is Cr and/or Ni, a is 78 to 86 atomic %, b is 0.001 to 5 atomic %, c is 7 to 20 atomic %, d is 0.001 to 4 atomic %, and x is 0.01 to 5 atomic %, (a+b+c+d+x) being 100.  
     
     
         7 . The Fe-based amorphous alloy ribbon according to  claim 6 , having a saturation magnetic flux density of 1.6 T or more, and a magnetic flux density of 1.5 T or more in a magnetic field of 80 A/m.  
     
     
         8 . The Fe-based amorphous alloy ribbon according to  claim 6 , wherein a is 78 to 85 atomic %, b is 0.001 to 3 atomic %, c is 10 to 20 atomic %, d is 0.01 to 3 atomic %, and x is 0.02 to 4 atomic %, and wherein said alloy ribbon has a saturation magnetic flux density of 1.65 T or more, and a magnetic flux density of 1.6 T or more in a magnetic field of 80 A/m.  
     
     
         9 . The Fe-based amorphous alloy ribbon according to  claim 6 , wherein said M is Cr, and x is 0.01 to 1 atomic %.  
     
     
         10 . The Fe-based amorphous alloy ribbon according to  claim 6 , wherein said M is Ni, and x is 0.1 to 5 atomic %.  
     
     
         11 . A magnetic core constituted by the Fe-based amorphous alloy ribbon recited in any one of  claims 1  to  10 , which is provided with a shape for a transformer by a cut-lap or step-lap method.