Iron-aluminum alloy and preparation method therefor

Abstract

Disclosed are an iron-aluminum alloy and its preparation method. The iron-aluminum alloy comprises, by weight, 50% to 80% of iron and the balance of aluminum. The method comprises: adding metal aluminum or molten aluminum to a container, wherein the temperature of the molten aluminum is between 700° C. and 800° C.; adding a metal iron raw material to the molten aluminum, closing a furnace cover, measuring the pressure, and introducing argon to ensure that the interior of a magnetic induction furnace is in a positive-pressure state, and stirring the mixture with a graphite stirring head; powering on and heating so that the metal aluminum or the molten aluminum is heated to 1000° C. or above and molten, and holding the temperature between 1000° C. and 1500° C.; and after alloying is completed, cooling to about 1000 t, opening the furnace cover, and taking the iron-aluminum alloy out.

1 . An iron-aluminum alloy, composed of metal aluminum and iron and comprising, by weight, 50% to 80% of iron and the balance of aluminum. 
     
     
         2 . A preparation method of the iron-aluminum alloy according to  claim 1 , the preparation method comprising the following steps:
 Step S 1 , adding a metal aluminum or a molten aluminum into a container, wherein the temperature of the molten aluminum is 700° C. to 800° C.;   Step S 2 , adding a metal iron raw material into the molten aluminum, closing a furnace cover, carrying out vacuumization, introducing argon, measuring temperature, and measuring pressure to ensure that the interior of a magnetic induction furnace is in a positive-pressure state, and stirring with a graphite stirring head;   Step S 3 , powering on and heating so that the metal aluminum or the molten aluminum is heated to 1000° C. or above and molten, and holding the temperature between 1000° C. and 1500° C., wherein the metal aluminum and iron form an intermetallic compound in this process and the time of the alloying process is between 30 min and 2 h; and   Step S 4 , after alloying is completed, cooling to about 1000° C., opening the furnace cover, and taking the iron-aluminum alloy out.   
     
     
         3 . The preparation method of the iron-aluminum alloy according to  claim 2 , wherein the container is a crucible placed in the magnetic induction furnace, or a crucible placed in a vacuum resistance furnace, or a non-vacuum heatable container with a protective flux and a fluxing agent. 
     
     
         4 . The preparation method of the iron-aluminum alloy according to  claim 3 , wherein a frequency of the magnetic induction furnace ranges from 800 Hz to 1200 Hz. 
     
     
         5 . The preparation method of the iron-aluminum alloy according to  claim 2 , wherein the metal iron raw material can be iron powder, iron flakes, iron filings or iron blocks, or a mixture of two or more of iron powder, iron flakes, iron filings and iron blocks. 
     
     
         6 . The preparation method according to  claim 2 , wherein in the Step S 3 , the time of stirring with the graphite stirring head is 0.5 h to 2 h. 
     
     
         7 . The preparation method according to  claim 2 , subsequent to the Step S 4 , further comprising:
 casting the iron-aluminum alloy into various types of blocks or flakes or breaking the same into grains (including powder) with different diameters as required, and adding the iron-aluminum alloy as an iron element additive to a smelting and preparation process of an aluminum alloy material to improve the physical properties of the produced aluminum product.