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An aluminum-based in-situ composite material formed based on laser 3D printing and its preparation method

An in-situ composite material, 3D printing technology, applied in the direction of additive processing, process efficiency improvement, energy efficiency improvement, etc. Comprehensive mechanical properties, overall mechanical properties improvement, and the effect of improving mechanical properties

Active Publication Date: 2018-05-08
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the existing aluminum-based in-situ composite materials and the existing technical means for preparing aluminum-based in-situ composite materials cannot effectively improve the mechanical properties of aluminum alloys such as strength and wear resistance.

Method used

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  • An aluminum-based in-situ composite material formed based on laser 3D printing and its preparation method
  • An aluminum-based in-situ composite material formed based on laser 3D printing and its preparation method
  • An aluminum-based in-situ composite material formed based on laser 3D printing and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0047] The invention is a method for preparing an aluminum-based in-situ composite material based on laser 3D printing, including:

[0048] Equipped with raw materials, Al-Si-Mg alloy powder with a purity of 99.7% and an average particle size of 30 um at a mass fraction ratio of 4:1 and Al with a purity of 99.5% and an average particle size of 5 um 2 o 3 The powder is mixed to obtain a mixture; wherein, the composition and mass percentage of the Al-Si-Mg alloy powder are 7.2% Si, 0.28% Mg, 2 o 3 The role of powder wettability promotes the uniformity of the dispersion of raw materials in the subsequent 3D printing process.

[0049] Ball milling, the mixture is milled by batch ball milling process, the diameter is Φ 8 mm Al 2 o 3 The ceramic ball is a ball milling medium, the weight ratio of the ball milling medium to the mixture is 5:1, every 10 minutes of ball milling is air-cooled for 5 minutes, and the particle size of the ball milling until the mixture is 1um; the speed...

Embodiment 2

[0056] The invention is a method for preparing an aluminum-based in-situ composite material based on laser 3D printing, including:

[0057] Equipped with raw materials, Al-Si-Mg alloy powder with a mass fraction ratio of 5:1 of 99.8% purity and an average particle size of 30um and Al with a purity of 99.7% and an average particle size of 5um 2 o 3 The mixture obtained by mixing the powders; wherein, the components and mass percentages of the Al-Si-Mg alloy powder are 9.2% Si, 0.48% Mg, <0.1% other impurity elements, and the balance is Al .

[0058] Ball milling, the mixture is milled by batch ball milling process, the diameter is Φ 10 mm Al 2 o 3 The ceramic ball is a ball milling medium, the weight ratio of the ball milling medium to the mixture is 10:1, every 30 minutes of ball milling is air-cooled for 10 minutes, and the particle size of the ball milling until the mixture is 10um; / min, ball milling time 9h.

[0059] The mixed powder after ball milling is subjected t...

Embodiment 3

[0064] The invention is a method for preparing an aluminum-based in-situ composite material based on laser 3D printing, including:

[0065] Equipped with raw materials, Al-Si-Mg alloy powder with a mass fraction ratio of 6:1 of 99.7% purity and an average particle size of 30um and Al with a purity of 99.5% and an average particle size of 5um 2 o 3 The mixture obtained by mixing powders; wherein, the composition and mass percentage of Al-Si-Mg alloy powder are 8% Si, 0.29% Mg, <0.1% other impurity elements, and the balance is Al.

[0066] Ball milling, the mixture is milled by batch ball milling process, the diameter is Φ 9mm Al 2 o 3 The ceramic ball is a ball milling medium, the weight ratio of the ball milling medium to the mixture is 8:1, every 20 minutes of ball milling is air-cooled for 8 minutes, and the particle size of the ball milling to the mixture is 8um; the speed of the balls of the intermittent ball mill is 380r / min, Ball milling time 6h.

[0067] The mixed ...

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Abstract

The invention belongs to the technical field of particle-reinforced aluminum-based in-situ composite materials and discloses an aluminum-based in-situ composite material formed based on laser 3D printing and a preparation method of the aluminum-based in-situ composite material. The preparation method includes the steps that a mixture of Al-Si-Mg alloy powder and Al2O3 powder is prepared; the mixture is ball-milled through an intermittent ball-milling process; a three-dimensional CAD model established through a workpiece is subjected to layered slicing treatment; laser beams are adopted for scanning the laid powder line by line to form a two-dimensional section of the workpiece; and the steps are repeated till the workpiece is machined, and the aluminum-based in-situ composite material with an Al2Si4O10 reinforced element scattered on an Al matrix is formed. The operation method is easy and convenient to carry out, Al-Si-Mg alloy and Al2O3 generate the Al2Si4O10 reinforced phase in situ under the effect of high-energy lasers in the laser forming process, the interface wettability is improved, and then the interface strength of the composite material is enhanced.

Description

technical field [0001] The invention relates to the technical field of particle-reinforced aluminum-based in-situ composite materials, in particular to an aluminum-based in-situ composite material formed based on laser 3D printing and a preparation method thereof. Background technique [0002] Aluminum and its alloy materials have a series of excellent characteristics such as light density, good elasticity, high specific stiffness and specific strength, good impact resistance, good electrical and thermal conductivity, good forming and processing performance, and high recycling and regeneration. They are considered to be " "Sunrise Materials" have been widely used in transportation, aerospace, mineral processing and other fields. However, aluminum and its alloys have problems such as low hardness and poor wear resistance, which greatly limit the application of aluminum and its alloys, and become the bottleneck of research and development in the field of aluminum alloys. [0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/105B33Y10/00C22C21/00C22C32/00
CPCB22F3/105C22C21/00C22C32/001Y02P10/25
Inventor 顾冬冬决久斌戴冬华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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