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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

Inactive Publication Date: 2010-09-01
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional hot-pressing process starting from nanoparticles has disadvantages such as complex preparation technology, high cost, low material quality (such as a large number of voids in the material), and difficulty in maintaining the nanometer size of the particles.
However, the large deformation method developed in recent years is difficult to obtain materials with a grain size smaller than 100nm, and is basically limited to metal materials.
Therefore, there is no simple, low-cost and scalable industrial production process for obtaining bulk nanostructure materials, which seriously hinders the research and engineering application of nanocrystalline materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] By Al 31%, Fe 2 o 3 65%, Cr 3% ratio to prepare the raw material, the raw material is powder. The preparation method is as follows: mix the weighed powder in a planetary ball mill for 16 hours, then place the mixed reaction material in a copper mold equipped with a copper substrate and compact it with a press under a pressure of 60 MPa. Put the igniter on the surface, and then carry out the reaction in the aluminothermic reaction vessel. At room temperature, purge the reaction vessel with argon to remove the air in it. When the temperature of the vessel rises to 180°C, exhaust again, and then pass in 8MPa argon. Continue to increase the container temperature. When the temperature in the container reaches about 260°C, the igniter starts to react and releases a large amount of heat, thereby initiating the reaction between the reacting materials. The reaction is completed within a few seconds, and the resulting product is cooled to room temperature with the furnace und...

Embodiment 2

[0014] 28% by Al, Fe 2 o 3 61%, Cr 6% ratio to prepare the raw material, the raw material is powder. Weigh the corresponding mass, mix the weighed powder in a planetary ball mill for 16 hours, put an igniter on its surface, then place the mixed reaction material in a copper mold equipped with a copper substrate and use a press Compact under the pressure of 60MPa, carry out the reaction in the aluminothermic reaction vessel, purge the reaction vessel with argon gas at room temperature to remove the air in it, wait until the temperature of the vessel rises to 180°C, exhaust again, and then pass in 8MPa argon gas Continue to increase the container temperature. When the temperature in the container reaches about 260°C, the igniter starts to react and releases a large amount of heat, thereby initiating the reaction between the reacting materials. The reaction is completed within a few seconds, and the resulting product is cooled to room temperature with the furnace under the pr...

Embodiment 3

[0016] 26% by Al, Fe 2 o 3 57%, Cr 8% ratio to prepare the raw material, the raw material is powder. Weigh the corresponding mass, mix the weighed powder in a planetary ball mill for 16 hours, put an igniter on its surface, then place the mixed reaction material in a copper mold equipped with a copper substrate and use a press Compact under the pressure of 60MPa, carry out the reaction in the aluminothermic reaction vessel, purge the reaction vessel with argon gas at room temperature to remove the air in it, wait until the temperature of the vessel rises to 180°C, exhaust again, and then pass in 8MPa argon gas Continue to increase the container temperature. When the temperature in the container reaches about 260°C, the igniter starts to react and releases a large amount of heat, thereby initiating the reaction between the reacting materials. The reaction is completed within a few seconds, and the resulting product is cooled to room temperature with the furnace under the pr...

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Abstract

The invention relates to an Fe-Al-Cr blocky nanocrystalline material and a preparation method thereof. The Fe-Al-Cr blocky nanocrystalline material comprises the following components in percentage by weight: 9.8 to 14 percent of Al, 60 to 85 percent of Fe and 0 to 30 percent of Cr. The preparation method comprises the following steps of: weighing corresponding components in percentage by weight, mixing the weighed powder for 16h, then putting the well-mixed reactant in a copper die, compacting under the pressure of 60MPa, putting an ignition agent on the surface of the reactant, then reacting in a reaction vessel, introducing argon at room temperature, isothermally heating to 180 DEG C and exhausting again, then introducing argon under the pressure of 8MPa and continuously heating the vessel; beginning to react the ignition agent and releasing a great deal of heat when the temperature in the vessel reaches about 260 DEG C, thereby initiating the reaction among materials; and cooling the generated product to the room temperature along with a furnace so as to prepare the alloy.

Description

technical field [0001] The invention relates to the preparation technology of bulk nano crystal material. Background technique [0002] Room temperature brittleness is a major obstacle to the widespread use of intermetallic materials. The nanonization of grain size is expected to solve the ubiquitous problem of room temperature brittleness. With the continuous development and maturity of nanomaterial technology in recent decades, researchers from all over the world are considering the use of nanomaterial technology to further solve the problems of room temperature brittleness of intermetallic compounds. However, the traditional hot-pressing process starting from nanoparticles has disadvantages such as complex preparation technology, high cost, low material quality (such as a large number of voids in the material), and difficulty in maintaining the nanometer size of the particles. However, the large deformation method developed in recent years is difficult to obtain materia...

Claims

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Application Information

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IPC IPC(8): C22C38/18C22C1/05
Inventor 喇培清程春杰赵阳
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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