Process for production of fe based amorphous alloy

Abstract

According to exemplary embodiments of the present invention, a process for production of an amorphous alloy can be provided at low cost by, e.g., efficiently removing magnetic-property-degrading Al and Ti when using inexpensive Fe—B or scrap as an amorphous alloy raw material. An exemplary embodiment of the process for production of an Fe-based amorphous alloy ribbon can comprise, by mass, e.g., 2 to 4% of B, 1 to 6% of Si, and a balance of Fe and unavoidable materials is provided. For example, it can be determined whether the molten alloy obtained by melting a main raw material has a Ti concentration or Al concentration of 0.005 mass % or greater: When such even occurs, iron oxide source having an iron content of 55 mass % or greater can be added thereto to reduce both Ti and Al to less than 0.005 mass % by oxidative removal. Alternatively, it is possible to determine whether the main raw material has a composition whose Ti concentration or Al concentration is 0.005 mass % or greater, and when it does, an iron oxide source having an iron content of 55 mass % or greater is precharged into a melting vessel together with the main raw material.

1 - 4 . (canceled) 
   
   
       5 . A process for producing an Fe-based amorphous alloy which comprises, by mass, about 2 to 4% of B, about 1 to 6% of Si, and a balance of Fe and unavoidable materials, the process comprising:
 determining whether an iron melt obtained by melting a main raw material has a Ti concentration or an Al concentration of at least about 0.005 mass %; and   when such determination yields a positive result, adding an iron oxide source having an iron content of at least about 55 mass % to the molten alloy to reduce Ti and Al to less than about 0.005 mass % using an oxidative removal procedure.   
   
   
       6 . The process according to  claim 5 , wherein the Fe-based amorphous alloy further comprises, by mass, at least one of about 0.001 to 3% of C or about 0.008 to 0.15% of P. 
   
   
       7 . The process according to  claim 5 , wherein, by mass, Fe is partially replaced by at least one of Co plus Ni of at most about 20% of Fe content and Cr of at most about 6% of Fe content. 
   
   
       8 . A process for producing an Fe-based amorphous alloy which comprises, by mass, about 2 to 4% of B, about 1 to 6% of Si, and a balance of Fe and unavoidable materials, the process comprising:
 determining whether a main raw material has a composition which includes a Ti concentration or an Al concentration of at least about 0.005 mass %; and   when such determination yields a positive result, precharging an iron oxide source having an iron content of at least about 55 mass % into a melting vessel with the main raw material.   
   
   
       9 . The process according to  claim 8 , wherein the Fe-based amorphous alloy Fe-based amorphous alloy further comprises, by mass, at least one of about 0.001 to 3% of C or about 0.008 to 0.15% of P. 
   
   
       10 . The process according to  claim 8 , wherein, by mass, Fe is partially replaced by at least one of Co plus Ni of at most about 20% of Fe content and Cr of at most about 6% of Fe content.