Iron-based amorphous alloy having low stress sensitivity, and preparation method therefor

Abstract

An iron-based amorphous alloy. The iron-based amorphous alloy comprises components FeaBbSic, a, b and c respectively indicating atomic percentage contents, 79.5≤a≤82.5, 11.0≤b≤13.5, 6.5≤c≤8.5, and a+b+c=100. An iron-based amorphous alloy strip is obtained by means of a rapid quenching method in which a single roller is used. Because the iron-based amorphous alloy has higher saturated magnetic induction density, a higher amorphous formation capability and lower stress-resistance sensitivity, the iron-based amorphous alloy can be used as an iron core material for preparing a power transformer, a power generator and an engine; in addition, due to the low stress sensitivity of the iron-based amorphous alloy, the sudden short-circuit resistance capability of an amorphous transformer can be improved when the power transformer is prepared.

1 . An iron-based amorphous alloy represented by formula (I):
   Fe a B b Si c    (I);
   wherein a, b and c are each independently atomic percentages of corresponding components, 79.5≤a≤82.5, 11.0≤b≤13.5, 6.5≤c≤8.5, and a+b+c=100.   
     
     
         2 . The iron-base amorphous alloy according to  claim 1 , wherein the saturation magnetic induction of the iron-based amorphous alloy is ≥1.60 T. 
     
     
         3 . The iron-base amorphous alloy according to  claim 1 , wherein the atomic percentage of Fe is 80.0≤a≤81.5. 
     
     
         4 . The iron-base amorphous alloy according to  claim 1 , wherein the atomic percentage of B is 11.0≤b≤12.5. 
     
     
         5 . The iron-base amorphous alloy according to  claim 1 , wherein the atomic percentage of Si is 7.0≤c≤8.0. 
     
     
         6 . The iron-base amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy a=80.0, 12.0≤b≤13.0, and 7.0≤c≤8.0. 
     
     
         7 . The iron-base amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy a=80.5, 11.5≤b≤12.5, and 7.0≤c≤8.0. 
     
     
         8 . The iron-base amorphous alloy according to  claim 1 , wherein in the iron-based amorphous alloy 81.0≤a≤81.5, 11.0≤b≤13.0, and 7.0≤c≤8.0. 
     
     
         9 . A method for preparing an iron-based amorphous alloy strip represented by formula (I), comprising:
 preparing raw materials according to the atomic percentages indicated in formula (I); smelting the raw materials; heating and insulating the molten liquid after smelting;   performing single roller rapid quenching to obtain the iron-based amorphous alloy strip;
   Fe a B b Si c    (I);
 
   wherein a, b and c are each independently atomic percentages of corresponding components; 79.5≤a≤82.5, 11.0≤b≤13.5, 6.5≤c≤8.5, and a+b+c=100.   
     
     
         10 . The method according to  claim 9 , further comprising subjecting the iron-based amorphous alloy to heat treatment after the single roller rapid quenching. 
     
     
         11 . The method according to  claim 10 , wherein prior to the heat treatment, further comprising winding the iron-based amorphous alloy into a sample ring with an inside diameter of 50.5 mm and an outside diameter from 53.5 to 54 mm, wherein allowable gauge factor of the sample ring loss is 10.0% and allowable gauge factor of the excitation power is 6% after heat treatment. 
     
     
         12 . The method according to the  claim 10 , wherein the coercive force of an iron-based amorphous alloy strip after heat treatment is ≤3.5 A/m; under a condition of 50 Hz and 1.35 T, excitation power of the iron-based amorphous alloy strip after heat treatment is ≤0.1450 VA/kg, and core loss is ≤0.1100 W/kg; and under a condition of 50 Hz and 1.40 T, excitation power of the iron-based amorphous alloy strip after heat treatment is ≤0.1700 VA/kg, and core loss is ≤0.1500 W/kg. 
     
     
         13 . The method according to  claim 10 , wherein the iron-based amorphous alloy strip is in completely amorphous phase with a limit thickness of at least 75 μm and a shearable limit thickness of at least 29 μm.