Amorphous metal foil and method for producing an amorphous metal foil using a rapid solidification technology

Abstract

Amorphous metal foil and method for the production of an amorphous metal foil using a rapid solidification technology is provided. An amorphous metal foil having a width of 2 mm to 300 mm, a thickness of less than 20 μm and a maximum of 50 holes per square metre is also provided.

1 . An amorphous metal foil, having
 a width of 2 mm to 300 mm,   a thickness of less than 20 μm and   a maximum of 50 holes per square meter.   
     
     
         2 . An amorphous metal foil according to  claim 1 , the amorphous metal foil having
 a width of 20 mm to 200 mm and/or   a thickness of between 10 μm and 18 μm and/or   fewer than 25 holes per square meter.   
     
     
         3 . An amorphous metal foil according to  claim 1 , wherein the holes each have a diameter of up to 5 mm. 
     
     
         4 . An amorphous metal foil according to  claim 1 , wherein the foil has a total area of at least 10 square meters and on average fewer than 50 holes per square meters. 
     
     
         5 . An amorphous metal foil according to  claim 1 , wherein the thickness is the average thickness of the foil over a length of 2 km. 
     
     
         6 . An amorphous metal foil according to  claim 1 , wherein the thickness is the average thickness over the width of the foil. 
     
     
         7 . An amorphous metal foil according to  claim 1 , wherein the foil has a wheel side that was formed by solidification on the outer surface of a heat sink, and an opposing, air side, wherein the wheel side of the foil has a surface roughness with an arithmetic mean, Ra, of less than 0.8 μm. 
     
     
         8 . An amorphous metal foil according to  claim 1 , wherein the wheel side has a surface roughness with a deviation of less than +/−0.2 μm over a length of at least 2 km and/or over a surface of at least 100 m 2 . 
     
     
         9 . An amorphous metal foil according to  claim 1 , wherein the foil has a continuous length of at least 2 km. 
     
     
         10 . An amorphous metal foil according to  claim 1 , wherein the amorphous metal foil is a nickel-based foil or a cobalt-based foil or a copper-based foil. 
     
     
         11 . An amorphous metal foil according to  claim 1 , wherein the amorphous metal foil is an iron-based foil. 
     
     
         12 . An amorphous metal foil according to  claim 11 , wherein the foil comprises (Fe,T) a M b  and up to 1 at. % impurities, where 70 at. %≤a≤90 at. % and 10 at. %≤b≤30 at. %, T is one or more of the elements Co, Ni, Mn, Cu, Nb, Mo, Cr, Zn, Sn and Zr and M is one or more of the elements B, Si, C and P. 
     
     
         13 . An amorphous metal foil according to  claim 11 , wherein the foil comprises Fe a Cu b M c M′ d M″ e Si f B g  and up to 1 at. % impurities, M is one or more of the elements from the group of IVa, Va, VIa elements or the transition metals, M′ is one or more of the elements Mn, Al, Ge and the platinum elements and M″ is Co and/or Ni, where a+b+c+d+e+f+g+impurities=100 at. % and
 0.01≤b≤8, 
 0.01≤c≤10, 
 0≤d≤10, 
 0≤e≤20, 
 10≤f≤25, 
 3≤g≤12 and 
 17≤f+g≤30.