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Powder metallurgy preparation method for nano-particle reinforced ultra-fine grain metal-matrix composite

A nano-particle and composite material technology is applied in the field of powder metallurgy preparation of nano-particle reinforced ultra-fine-grained metal matrix composite materials, which can solve the problems of long ball milling time, high energy consumption, time-consuming and laborious, etc., so as to improve the work hardening ability, The effect of high dispersion uniformity and wide application range

Active Publication Date: 2017-01-11
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the mechanical alloying method can better realize the dispersion of nanoparticles, it also has the following disadvantages: the original metal powder is usually a spherical powder of tens of microns, which has a large size difference from the nano-reinforcement body, and it takes a long time for the ball milling process To achieve grain refinement and dispersion, it is time-consuming and laborious, and it is easy to cause local nanoparticles to re-agglomerate; powder and 5vol.% Al with a diameter of 35nm 2 o 3 The particles were directly mixed and ball milled at 250 rpm for 24 hours in a planetary ball mill. It was found that in the early stage of ball milling (within 8 hours) the nanoparticles were agglomerated on the surface of the aluminum particles, and it took more than 20 hours of ball milling to make the nano Al 2 o 3 The particles are better embedded in the aluminum matrix and reach a stable state
Nevertheless, there are still quite a few nanoparticles agglomerated together, resulting in poor strengthening effect
The disadvantage of the existing mechanical alloying technology is that in the initial stage of ball milling, the nanoparticles are wrapped into the matrix powder in the form of clusters, which requires a long time of ball milling, that is, the repeated large deformation process of the matrix metal powder. The particles are further dispersed into the matrix
The total ball milling time is long and the energy consumption is high

Method used

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  • Powder metallurgy preparation method for nano-particle reinforced ultra-fine grain metal-matrix composite
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  • Powder metallurgy preparation method for nano-particle reinforced ultra-fine grain metal-matrix composite

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Effect test

Embodiment 1

[0047] Embodiment 1: Nano silicon carbide / aluminum (SiC / Al) composite material

[0048] like figure 1 Shown, a kind of powder metallurgy preparation method of nanoparticle reinforced ultrafine grain metal matrix composite material, described method is used for preparing the process of nano silicon carbide / aluminum (SiC / Al) composite material as follows:

[0049] Take 1000g of 10μm pure aluminum (Al) powder in a stirring ball mill, use absolute ethanol as a solvent, add 40g of titanate as a ball milling process control agent, the ratio of ball to material is 20:1, and ball mill at a speed of 352 rpm After 1h, filter and vacuum dry to obtain flake aluminum powder, the diameter of the flake aluminum powder is 20-40 μm, the thickness is 1-2 μm, and the diameter-thickness ratio is 20-40;

[0050] Take 100g of nano-silicon carbide (SiC) particles with an average particle size of 50nm, add them to absolute ethanol for ultrasonic cleaning, filter, and dry;

[0051] Add 950g of the a...

Embodiment 2

[0058] Embodiment 2: Nano boron carbide / magnesium composite material

[0059] like figure 1 Shown, a kind of powder metallurgy preparation method of nanoparticle-reinforced ultrafine-grain metal matrix composite material, described method is used for the process of preparing nano-boron carbide / magnesium composite material as follows:

[0060] Take 200g, 30μm spherical magnesium powder and place it in a stirring ball mill, use argon as a protective atmosphere, add 6g of stearic acid as a ball milling process control agent, the ball-to-material ratio is 20:1, and ball mill for 3 hours at a speed of 423 rpm , to obtain flake aluminum powder, the flake aluminum powder has a sheet diameter of 50-70 μm, an average sheet thickness of 200 nm, and a diameter-thickness ratio greater than 200;

[0061] Prepare nano-boron carbide (B) according to the method in Example 1 4 C) powder, the average size of nano boron carbide particles is 40nm;

[0062] Add 186g of the above-mentioned flaky...

Embodiment 3

[0063] Embodiment 3 nanometer titanium carbide / titanium composite material

[0064] like figure 1 Shown, a kind of powder metallurgy preparation method of nanoparticle-reinforced ultra-fine-grained metal-matrix composite material, described method is used for the process of preparing nano-titanium carbide / titanium composite material as follows:

[0065] Take 500g of titanium powder with an average particle size of 45μm and place them in two planetary ball mill jars respectively, use argon as the protective atmosphere, add 2.5g of stearic acid as the ball milling process control agent, the ball-to-material ratio is 20:1, and use 426 rpm Ball milling at a rotating speed of 2 hours per minute to obtain flaky titanium powder with a sheet diameter of 50-70 μm, an average sheet thickness of 300 nm, and a ratio of diameter to thickness greater than 150;

[0066] Add 485g of the above-mentioned flaky titanium powder and 15g of nano-titanium carbide particles with an average diameter ...

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Abstract

The invention provides a powder metallurgy preparation method for a nano-particle reinforced ultra-fine grain metal-matrix composite. According to the method, a metal-matrix grain refining process and a nano-particle dispersing process are carried out in steps. The method comprises the steps that firstly, micro-nano flaky metal-matrix powder is prepared in advance; nano-particles and the flaky metal-matrix powder are stirred and mixed in a stirrer at the high speed under protective atmosphere, and by means of high shear force and pressure generated between stirring blades and a tank body, the nano-particles are uniformly dispersed to the surface of the micro-nano flaky metal-matrix powder; through short-time mechanical ball-milling treatment, the nano metal particles are embedded into the micro-nano flaky metal-matrix powder, so that composite powder of nano-particle reinforced metal is obtained; and compression moulding, sintering and compacting treatment are conducted, so that the ultra-fine grain metal-matrix composite with the nano-particles uniformly dispersed is obtained. By means of the powder metallurgy preparation method, time and energy are saved; cost is low; the application range is wide; and the prepared material is high in comprehensive mechanical performance and has large-scale application potential.

Description

technical field [0001] The invention relates to the technical field of metal-matrix composite materials, in particular to a powder metallurgy preparation method of nanoparticle-reinforced ultrafine-grain metal-matrix composite materials. Background technique [0002] The metal matrix composite material composed of a metal matrix and a reinforcement has both the ductility of the metal and the high hardness and high modulus of the reinforcement. It has important uses and is irreplaceable in high-tech fields such as transportation and aerospace. sex. With the further development of science and technology, high-tech fields such as transportation, aerospace and other high-tech fields also put forward higher requirements for the comprehensive performance of metal matrix composites. The development direction of the first-generation metal matrix composites, therefore, the development of nanoparticle-reinforced ultrafine-grained composites preparation technology is a research hotspo...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/14B22F3/20B22F9/04C22C1/05C22C14/00C22C21/00C22C23/00C22C32/00
CPCB22F3/02B22F3/14B22F3/20B22F9/04B22F2003/145B22F2009/043C22C1/05C22C14/00C22C21/00C22C23/00C22C32/0021C22C32/0036C22C32/0052C22C32/0057C22C32/0063
Inventor 范根莲陈马林谭占秋李志强张荻
Owner SHANGHAI JIAO TONG UNIV
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