Iron-based amorphous alloy and method for preparing the same

Abstract

The present disclosure provides an iron-based amorphous alloy as shown in formula (I): FeaSibBcPdMe (I); wherein a, b, c, d, and e are each independently atomic percentages of corresponding components; 80.5≤a≤84.0, 3.0≤b≤9.0, 8.0≤c≤15.0, 0.001≤d≤0.3, e≤0.4, and a+b+c+d+e=100; M is impurity element. The present disclosure provides an iron-based amorphous strip which has a saturation magnetic induction less than 1.62T. The present disclosure also provides a method for preparing the iron-based amorphous alloy. Further, after appropriate heat treatment, excellent soft magnetic properties will be obtained. The alloy material can be used as core material in the manufacture of power transformer, generator and engine.

1 . An iron-based amorphous alloy as shown in formula (I):
   Fe a Si b B c P d M e   (I);
   wherein a, b, c, d, and e are each independently atomic percentages of corresponding components; 80.5≤a≤84.0, 3.0≤b≤9.0, 8.0≤c≤15.0, 0.001≤d≤0.3, e≤0.4, and a+b+c+d+e=100; M is impurity element.   
     
     
         2 . The iron-based amorphous alloy according to  claim 1 , wherein saturation magnetic induction of the iron-based amorphous alloy is ≥1.62 T. 
     
     
         3 . The iron-based amorphous alloy according to  claim 1 , wherein the atomic percentage of Si is 5.5≤b≤9.0. 
     
     
         4 . The iron-based amorphous alloy according to  claim 1 , wherein the atomic percentage of P is 0.001≤d≤0.2. 
     
     
         5 . The iron-based amorphous alloy according to  claim 1 , wherein the atomic percentage of P is 0.01≤d≤0.1. 
     
     
         6 . The iron-based amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy a=80.95, 3.0≤b≤8.0, 11.0≤c≤15.0, d=0.05. 
     
     
         7 . The iron-based amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy 81.7≤a≤81.99, 3.0≤b≤8.0, 10.0≤c≤15.0, 0.01≤d≤0.3. 
     
     
         8 . The iron-based amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy a=82.95, 3.0≤b≤8.0, 8.0≤c≤14.0, d=0.05. 
     
     
         9 . The iron-based amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy a=83.95, 3.0≤b≤8.0, 8.0≤c≤13.0, d=0.05. 
     
     
         10 . A method for preparing the iron-based amorphous alloy according to  claim 1 , comprising:
 calculating and preparing raw materials according to the atomic percentage indicated in the iron-based amorphous alloy formula Fe a Si b B c P d ; smelting the raw materials; heating and insulating the molten materials; performing single roller rapid quenching to give an iron-based amorphous alloy strip.   
     
     
         11 . The method according to  claim 10 , wherein further comprises, after the single roller rapid quenching, subjecting the iron-based amorphous alloy to heat treatment. 
     
     
         12 . The method according to  claim 11 , wherein temperature of the heat treatment is from 300 to 360° C., insulation duration of the heat treatment is from 60 to 120 min and magnetic field strength is from 800 to 1400 A/m. 
     
     
         13 . The method according to  claim 11 , wherein coercive force of the heat treated iron-based amorphous alloy strip is ≤4 A/m; under a condition of 50 Hz and 1.35 T, excitation power of the heat treated iron-based amorphous alloy strip is less than or equals to 0.2200 VA/kg and core loss is ≤0.1800 W/kg. 
     
     
         14 . The method according to  claim 10 , wherein the iron-based amorphous alloy strip is in completely amorphous phase with a critical thickness of at least 45 μm. 
     
     
         15 . The method according to  claim 10 , wherein the thickness of the iron-based amorphous alloy strip is from 23 to 32 μm and the width of the iron-based amorphous alloy strip is from 100 to 300 mm.