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Method for preparing nano particle reinforced aluminum matrix composites

A composite material and reinforced aluminum matrix technology, which is applied in the field of preparing nano-ceramic particle-reinforced aluminum-based composite materials, can solve the problems of difficult wetting between nano-ceramic particles and metal matrix, poor dispersion of nano-ceramic particles, etc., and achieve short milling time and high efficiency. High, the effect of improving the production efficiency

Active Publication Date: 2015-12-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a new method for preparing nano-ceramic particle-reinforced aluminum-based composite materials to solve the problems of difficult wetting between nano-ceramic particles and metal substrates and poor dispersion of nano-ceramic particles in metal melts

Method used

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  • Method for preparing nano particle reinforced aluminum matrix composites
  • Method for preparing nano particle reinforced aluminum matrix composites

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1: Weigh 2g of SiC powder with an average particle size of 40nm and a purity greater than 99.9% and 98g of pure Al powder with an average particle size of 70 μm and a purity of 99.85% or higher, wherein the volume of nano-SiC accounts for about 20% of the total volume.

[0041] Step 2: Add 500g of stainless steel grinding balls to a 500ml metal ball mill tank, 20 large balls with a diameter of 10mm, and the rest are small balls with a diameter of 6mm; pour the SiC powder and Al powder weighed in the first step Mill jar.

[0042] The third step: evacuate the ball mill tank, pass argon gas, and evacuate.

[0043] Step 4: Start ball milling. Ball milling parameter is 300r / min, intermittent ball milling, ball milling for 1h, stop for 20min, take out millimeter-scale nano-SiC after ball milling for 10h p / Al composite particles.

[0044] The fifth step: the 500g millimeter-scale nano-SiC prepared by the above method p / Al composite particles were directly melted in ...

Embodiment 2

[0049] Step 1: Weigh 4g of SiC powder with an average particle size of 50nm and a purity of greater than 99.9% and 100g of pure Al powder with an average particle size of 80μm and a purity of greater than or equal to 99.85%, wherein the volume of SiC accounts for about 40% of the total volume.

[0050] Step 2: Add 1000g of stainless steel grinding balls to a 500ml metal ball mill tank, 50 large balls with a diameter of 10mm, and the rest are small balls with a diameter of 6mm; pour the SiC powder and Al powder weighed in the first step into the ball mill Can.

[0051] The third step: evacuate the ball mill tank, pass argon gas, and evacuate.

[0052] Step 4: Start ball milling. Ball milling parameter is 400r / min, intermittent ball milling, ball milling for 1h, stop for 20min, take out millimeter-sized nano-SiC after ball milling for 8h p / Al composite particles.

[0053] Step 5: Incorporate millimeter-scale nano-SiC by mechanical stirring p / Al composite particles were add...

Embodiment 3

[0058] Step 1: Weigh 4g of SiC powder with an average particle size of 60nm and a purity greater than 99.9% and 100g of pure Al powder with an average particle size of 90μm and a purity of 99.85% or higher, wherein the volume of SiC accounts for about 40% of the total volume.

[0059] Step 2: Add 1500g of stainless steel grinding balls to a 500ml metal ball mill tank, 60 large balls with a diameter of 10mm, and the rest are small balls with a diameter of 6mm; pour the SiC powder and Al powder weighed in the first step into the ball mill Can.

[0060] The third step: evacuate the ball mill tank, pass argon gas, and evacuate.

[0061] Step 4: Start ball milling. Ball milling parameter is 500r / min, intermittent ball milling, ball milling for 1h, stop for 20min, take out millimeter-sized nano-SiC after ball milling for 6h p / Al composite particles.

[0062] Step 5: Millimeter nano-SiC was mixed by mechanical stirring method p / Al composite particles were added to the Al-Si all...

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Abstract

The invention discloses a method for preparing nano particle reinforced aluminum matrix composites. The method comprises the steps that firstly, mixed powder of nano ceramic powder and micron-sized aluminum or aluminum alloy powder is used for preparing millimeter-sized composite particles through a dry high-energy ball mill under the protection of vacuum or argon, wherein the volume fraction of nano ceramic particles in the millimeter-sized composite particles is 10-50%; and secondly, the millimeter-sized composite particles are melted directly or added into aluminum or aluminum melt, and supersonic vibration is applied, so that the nano ceramic particles are promoted to be uniformly dispersed in the metal melt, and the nano particle reinforced aluminum matrix composites are prepared. According to the method for preparing the nano particle reinforced aluminum matrix composites, the millimeter-sized composite particles prepared through a dry milling method can be added into the metal melt easily and completely, the problems that the wettability between the nano ceramic particles and matrix metal is poor, and adding of the particles is difficult are solved, and the advantage of low cost of a casting method for preparing metal matrix composites is given to play; the nano particles in the prepared composites are distributed uniformly, and the material performance is high.

Description

technical field [0001] The invention belongs to the field of metal-matrix composite materials (MMCs) and their preparation and molding, and relates to a method for preparing nano-ceramic particle-reinforced aluminum-matrix composite materials. Background technique [0002] Nano ceramic particles (such as SiC, TiC, MgO, Al 2 o 3 , SiO 2 、TiB 2 etc.) Reinforced aluminum matrix composites have excellent properties such as light weight, high hardness, high specific strength, high specific stiffness and wear resistance, and have broad application prospects in aerospace, automotive and other industrial fields, and have received extensive attention and research. [0003] Generally, the preparation methods of nano-ceramic particle reinforced aluminum matrix composites are divided into in-situ method and external method. The temperature of the in-situ method is high, the reaction speed is fast and difficult to control, and the size of the synthesized ceramic particles is difficul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/00
Inventor 吕书林肖攀吴树森毛有武
Owner HUAZHONG UNIV OF SCI & TECH
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