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Method for fabricating block body of nano pure aluminum material

A nano-block technology, which is applied in the field of preparation of bulk nano-pure aluminum materials, can solve problems such as unfavorable environmental protection, material performance fluctuations, and limitations on the application range of nano-structured materials, and achieve easy control of the process, easy mass production scale, Conducive to the effect of industrialization development

Inactive Publication Date: 2009-10-28
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Most preparation methods can only synthesize one metal or ceramic nanopowder at one time, but cannot prepare two or more uniformly mixed nanoparticles according to a predetermined ratio, which limits the application range of nanostructured materials
[0007] (3) Most preparation technologies require expensive large-scale equipment (such as high-energy lasers or plasma generators, etc.), resulting in excessive manufacturing costs, which is not conducive to the large-scale industrial application of nanostructured materials
[0008] (4) In the vapor phase deposition of nanoparticles, it is difficult to accurately control the size and size distribution of the particles. A wide particle size distribution often occurs, and large particles with a size several times the average particle size appear, which is not conducive to obtaining uniform nanocrystals. organization, will cause fluctuations in material properties
[0009] (5) Some processes need to use expensive raw materials when synthesizing ceramic powders and may produce harmful gas emissions, which is not conducive to environmental protection
Moreover, the study also showed that ball milling at liquid nitrogen temperature also leads to the in situ formation of nanoscale nitrogen oxides

Method used

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  • Method for fabricating block body of nano pure aluminum material
  • Method for fabricating block body of nano pure aluminum material
  • Method for fabricating block body of nano pure aluminum material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Commercially available Al powder is selected, the purity of the powder is 98% by weight, and the particle size is 75 microns. A vertical rotor ball mill and stainless steel balls and pots were selected, the ball-to-material ratio was 30:1, the ball milling temperature was -120°C, and Al powder with an average grain size of 39nm was formed after ball milling for 3 hours. The bulk Al material was obtained by vacuum hot pressing method. Vacuum degree is 1.2×10 -2 Pa, the heating temperature is 420°C, and the pressure is 284MPa. The density of bulk Al material is 2.68×10 3 kg / m 3 , The average grain size is 52nm. The ultimate tensile strength of the test bar is 150MPa, and the elongation is 18%.

Embodiment 2

[0029] Commercially available Al powder is selected, the purity of the powder is 98.5% by weight, and the particle size is 100 microns. A vertical rotor ball mill and stainless steel balls and pots were selected, the ball-to-material ratio was 40:1, the ball milling temperature was -140°C, and Al powder with an average grain size of 22nm was formed after ball milling for 11 hours. The bulk Al material was obtained by vacuum hot pressing method. Vacuum degree is 1.1×10 -3 Pa, the heating temperature is 480°C, and the pressure is 386MPa. The density of bulk Al material is 2.69×10 3 kg / m 3 , The average grain size is 62nm. The ultimate tensile strength of the test bar is 167MPa, and the elongation is 14%.

Embodiment 3

[0031] Commercially available Al powder is selected, the purity of the powder is 98.2% by weight, and the particle size is 180 microns. A high-energy horizontal rotor ball mill and stainless steel balls and tanks were selected, the ball-to-material ratio was 50:1, the ball milling temperature was -150°C, and Al powder with an average grain size of 28nm was formed after ball milling for 5 hours. The bulk Al material was obtained by vacuum hot pressing method. Vacuum degree is 1.7×10 -2 Pa, the heating temperature is 550°C, and the pressure is 484MPa. The density of bulk Al material is 2.71×10 3 kg / m 3 , with an average grain size of 74nm. The ultimate tensile strength of the test bar is 173MPa, and the elongation is 11%.

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Abstract

The invention provides a method for preparing block nano-pure aluminum material, which is characterized in that: commercially available Al powder is selected, the powder purity is greater than 98% by weight, and the particle size is 50-200 microns; Stable nano-Al powder, and then use medium and low temperature strong processing technology to prepare bulk nano-pure Al material. The invention has the advantages of being easy to realize mass production scale and being beneficial to industrial development; simple equipment, easy control of the process, and low comprehensive preparation cost; and can be widely used in the fields of micromechanics, electronics, nanotechnology and the like.

Description

technical field [0001] The invention belongs to the technical field of nano-aluminum material preparation, and in particular provides a method for preparing bulk nano-pure aluminum material. It can be widely used in the fields of micromechanics, electronics and nanotechnology. Background technique [0002] Nanomaterials refer to single-phase or multi-phase polycrystalline materials with a grain size ranging from 1 to 100 nm in at least one direction. They differ from ordinary materials of the same composition only in the grain size and the arrangement of atoms at the grain boundaries. When the grain size of polycrystalline materials is reduced to the nanometer level, its structure will change significantly. First, short programs that are different from ordered (crystal structures) or disordered (liquid or glass structures) states are formed in the material. With the continuous reduction of crystal grains, the number of interfaces continues to increase, and the number of i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/02B22F3/00B21C23/01B22F9/04
Inventor 杨滨樊建中张济山熊柏青程军胜田晓风崔华
Owner UNIV OF SCI & TECH BEIJING
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