Fe-Al-Cr blocky nanocrystalline material and preparation method thereof
A nanocrystalline material, 1. fe-al-cr technology, applied in the field of preparation of bulk nanocrystalline materials, can solve the problems that hinder the research and engineering application of nanocrystalline materials, limit metal materials, and difficult to maintain the nanometer size of particles. Achieve the effects of low atomic diffusion rate, lower production cost, and small critical crystal nucleus
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[0011] Example 1:
[0012] Press Al 31%, Fe 2 O 3 The raw material is prepared in the proportion of 65% and 3% Cr, and the raw material is in powder form. The preparation method is as follows: the weighed powder is mixed in a planetary ball mill for 16 hours, and then the mixed reaction material is placed in a copper mold equipped with a copper substrate and compacted with a press under a pressure of 60 MPa. Put an igniting agent on the surface, and then react in a thermite reaction vessel. Purge the reaction vessel with argon at room temperature to remove the air from it. Wait until the temperature of the vessel rises to 180°C and vent again, and then pass in 8MPa argon. Continue to increase the temperature of the container. When the temperature in the container reaches about 260°C, the igniting agent starts to react and release a large amount of heat, thereby triggering the reaction between the reaction materials. The reaction is completed in a few seconds, and the resulting...
Example Embodiment
[0013] Example 2:
[0014] Press Al 28%, Fe 2 O 3 The ratio of 61% to 6% Cr is used to prepare raw materials, which are in powder form. Weigh the corresponding mass, mix the weighed powder in a planetary ball mill for 16 hours, put an igniter on the surface, and place the mixed reaction material in a copper mold equipped with a copper substrate and use a press It is compacted under a pressure of 60MPa, and the reaction is carried out in a thermite reaction vessel. The reaction vessel is purged with argon at room temperature to remove the air from it. When the temperature of the vessel rises to 180°C, it is vented again, and then 8MPa argon is introduced. Continue to increase the temperature of the container. When the temperature in the container reaches about 260°C, the igniting agent starts to react and release a large amount of heat, thereby triggering the reaction between the reaction materials. The reaction is completed in a few seconds, and the resulting product is cooled...
Example Embodiment
[0015] Example 3:
[0016] According to Al 26%, Fe 2 O 3 The ratio of 57%, Cr 8% to prepare the raw material, the raw material is in powder form. Weigh the corresponding mass, mix the weighed powder in a planetary ball mill for 16 hours, put an igniter on the surface, and place the mixed reaction material in a copper mold equipped with a copper substrate and use a press It is compacted under a pressure of 60MPa, and the reaction is carried out in a thermite reaction vessel. The reaction vessel is purged with argon at room temperature to remove the air from it. When the temperature of the vessel rises to 180°C, it is vented again, and then 8MPa argon is introduced. Continue to increase the temperature of the container. When the temperature in the container reaches about 260°C, the igniting agent starts to react and release a large amount of heat, thereby triggering the reaction between the reaction materials. The reaction is completed in a few seconds, and the resulting product...
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