Microwave combustion synthesizing method for bulk nanocrystalline alloy

A nanocrystalline alloy and microwave combustion technology, which is applied in the field of microwave combustion synthesis of bulk nanocrystalline alloys, can solve the problems of high cost of nanocrystalline materials, unsatisfactory thermal stability, and uneven structure, and achieve fine and Uniformity, improvement of room temperature brittleness, and the effect of fully dense products

Active Publication Date: 2009-07-01
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of nanocrystalline materials by severe plastic deformation is costly, and the obtained grain size range is large, and it is not suitable for metals or alloys with poor plastic denaturation ability, especially intermetallic com

Method used

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  • Microwave combustion synthesizing method for bulk nanocrystalline alloy
  • Microwave combustion synthesizing method for bulk nanocrystalline alloy
  • Microwave combustion synthesizing method for bulk nanocrystalline alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1. Synthesis of Fe-Al bulk nano-alloys by microwave combustion.

[0018] According to the composition design, high-purity Al powder and high-purity Fe powder were weighed according to Table 1, and the above powders were mixed with a high-energy ball mill. After 8 hours, the powder was taken out and put into a steel mold for cold pressing at a pressure of 100Mpa. Put the pressed billets into crucibles respectively, place them in a microwave oven for heating, select a microwave heating power of 650W, and heat for 2 minutes. During the combustion synthesis process, a reaction occurs:

[0019] Fe+Al=FeAl or

[0020] 3Fe+Al=Fe 3 Al

[0021] The product was removed after cooling to room temperature.

[0022] Fe can also be used 2 o 3 Al powder is mixed with high-purity Al powder and prepared in the same way as above. During the microwave combustion synthesis process, the reaction occurs:

[0023] Fe 2 o 3 +4Al=2FeAl+Al 2 o 3 or

[0024] 3Fe 2 o 3 +8Al=2F...

Embodiment 2

[0029] Example 2. Synthesis of Fe-Al-B bulk nano-alloys using microwave combustion.

[0030] According to needs, the required non-metallic powder can also be added to the raw material, such as preparing Fe-Al-B bulk nano-alloy, B powder can be added on the basis of metal powder. Weigh the high-purity Fe powder, high-purity Al powder and B powder according to Table 2, adopt the technological process in Example 1, the powder mixing time is 10 hours, the pressing pressure is 100MPa, the microwave power is 700W, and the heating time is 3 minutes. Fe-Al-B bulk nanocrystalline alloys with different compositions can be prepared.

[0031] Table 2 Composition of Example 2 Fe-Al-B alloy

[0032]

Embodiment 3

[0033] Example 3. Synthesis of Fe-Al-Cu bulk nano-alloys by microwave combustion.

[0034] According to the composition design, high-purity Fe powder, high-purity Al powder and Cu powder were weighed according to Table 3, and Fe-Al-Cu bulk nanocrystalline alloys with different compositions were prepared according to the above process. The powder mixing time in the process is 12 hours, the pressing pressure is 100MPa, the microwave power is 750W, and the heating time is 3 minutes.

[0035] Table 3 Composition of Example 3 Fe-Al-Cu alloy

[0036]

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PUM

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Abstract

The invention discloses a microwave combustion synthesis method for a bulk nano-crystalline alloy. According to a target product, one or a mixture of two or three types of powder of metal powder, non-metal powder and metal oxide powder is selected as a raw material, a high energy ball mill is utilized to mix the raw material, the mixed powder is loaded into a steel mold and is pressed on a pressing machine, a well-pressed blank is placed into a crucible, the crucible is placed into a microwave oven to be heated, and a product is cooled to room temperature and then is taken out. The method hasthe advantages of simple process, short time consumption of microwave synthesis process, energy concentration, less energy consumption, no pollution, fully dense product, no pores, and fine and even crystal grains; the final size of the crystal grains can be controlled to 10nm; and the hardness, the strength and the plasticity of the bulk nano-crystalline alloy are greatly improved, and the obtained bulk nano-crystalline alloy also has excellent special physical properties such as light, electricity, sound, magnetism, and so on.

Description

1. Technical field [0001] The invention relates to a preparation method of bulk nano crystal alloy, in particular to a microwave combustion synthesis method of bulk nano crystal alloy. 2. Background technology [0002] Bulk nanocrystalline material mainly refers to a three-dimensional bulk material composed of grains with a grain size in the nanometer scale (5-100nm). Compared with corresponding microcrystalline materials, nanocrystalline metals and alloys have higher hardness and wear resistance, ultra-high yield strength and fracture strength, and good plastic deformation ability at lower temperature and higher strain rate At the same time, it also has special physical properties such as sound, light, electricity, and magnetism, so it has a bright future in engineering applications. At present, the preparation technology of nanomaterials from zero-dimensional scale to two-dimensional scale, that is, nanoparticles, nanowires, nanotubes, and nanofilms, is relatively mature,...

Claims

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Application Information

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IPC IPC(8): C22C1/05C22C21/00
Inventor 孔见黄洁雯
Owner NANJING UNIV OF SCI & TECH
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