Iron-based high saturation induction amorphous alloy

Abstract

An iron-based amorphous alloy and magnetic core with an iron-based amorphous alloy having a chemical composition with a formula Fe a B b Si c C d , where 80<a≦84, 8≦b≦18, 0<c≦5 and 0<d≦3, numbers being in atomic percent, with incidental impurities, simultaneously having a value of a saturation magnetic induction exceeding 1.6 tesla, a Curie temperature of at least 300° C. and a crystallization temperature of at least 350 ° C. When cast in a ribbon form, such an amorphous metal alloy is ductile and thermally stable, and is suitable for various electric devices because of high magnetic stability at such devices' operating temperatures.

1 . An iron-based amorphous alloy comprising: a chemical composition with a formula Fe a B b Si c C d  where 81<a≦84, 8≦b≦18, 0<c≦5 and 0<d≦3, numbers being in atomic percent, with incidental impurities, simultaneously having a value of saturation magnetic induction greater than 1.6 tesla, a Curie temperature of at least 300° C. and a crystallization temperature of at least 350° C., wherein the alloy is heat-treated to be annealed from 300° C. to 350° C.  
   
   
       2 . The alloy of  claim 1 , having a formula of Fe 82 B 14 Si 2 C 2 .  
   
   
       3 . The alloy of  claim 1 , having the saturation magnetic induction greater than 1.65 tesla.  
   
   
       4 . The alloy of  claim 3 , having a formula of Fe 82 B 14 Si 2 C 2 .  
   
   
       5 . The alloy of  claim 1 , wherein a core loss is less than or equal to 0.5 W/kg after the alloy has been annealed, when measured at 60 Hz, 1.5 tesla and at room temperature.  
   
   
       6 . The alloy of  claim 1 , in which a DC squareness ratio is greater than 0.8 after the alloy has been annealed.  
   
   
       7 . A magnetic core comprising an amorphous alloy of  claim 5 , the magnetic core being a magnetic core of a transformer or a electrical choke coil.  
   
   
       8 . A magnetic core comprising an amorphous alloy of  claim 6 , the magnetic core being an inductor core of a magnetic switch in a pulse generator and/or compressor.  
   
   
       9 . An article of manufacture comprising an iron-based amorphous alloy cast in a ribbon form wherein the alloy comprises: a chemical composition with a formula Fe a B b Si c C d  where 81<a≦84, 8≦b≦18, 0<c≦5 and 0<d≦3, numbers being in atomic percent, with incidental impurities, simultaneously having a value of saturation magnetic induction greater than 1.6 tesla, a Curie temperature of at least 300° C. and a crystallization temperature of at least 350° C., wherein the alloy is heat-treated to be annealed from 300° C. to 350° C., and the article of manufacture is a magnetic switch, an electrical choke, a transformer, a motor, a generator, a magnetic inductor, or a magnetic sensor.