A cross-scale in-situ particle reinforced aluminum matrix composite material and its preparation method

An aluminum-based composite material and particle-reinforced aluminum technology are applied in the field of cross-scale in-situ particle-reinforced aluminum-based composite materials and their preparation, which can solve the problem of high volume fraction, achieve low reaction temperature, strong designability, and aluminum burning loss. less effect

Active Publication Date: 2011-12-28
JIANGSU UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

[0005] At present, in-situ nanoparticle-reinforced aluminum-matrix composites often use external physical fields to assist chemical reactions and promote enhanced particle distribution. There have been many studies on the preparation process; the preparation process of in-situ micron-sized particle-reinforced aluminum-matrix composites is relatively mature. However, due to the relatively high volume fraction and the possible interaction of particles of different sizes in the preparation of aluminum matrix composites reinforced by nanometer and micron in-situ particles, there is no relevant report at home and abroad. The present invention hopes to adopt appropriate Volume fraction of in-situ nanoparticles, and try to form micron-sized particles during the solidification process, which not only ensures the formability of the material, but also makes the composite material have good performance

Method used

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  • A cross-scale in-situ particle reinforced aluminum matrix composite material and its preparation method
  • A cross-scale in-situ particle reinforced aluminum matrix composite material and its preparation method
  • A cross-scale in-situ particle reinforced aluminum matrix composite material and its preparation method

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Embodiment 1

[0024] It is required to prepare nano-Al 2 o 3 Particle volume fraction is 1.5%, micron (Si+Al 3 Ti) particle volume fraction of 6% cross-scale in-situ particle-reinforced aluminum matrix composites, the Al-10wt% Si alloy is melted, and SiO is added at 10wt% of the Al-Si alloy 2 For melting, heat up to 800 o About C, keep warm for 10 minutes and then refine, add 0.3% (P+S) composite modifier and cool down to 710°C, then use a frequency of 20kHz and a power density of 400W / cm 2 Ultrasonic treatment of the melt for 25 minutes, adding 1wt% titanium powder and 0.3wt% rare earth while ultrasonic treatment, standing for 5 minutes, then removing slag, adjusting the temperature and pouring, and finally forming (Si+Al 3 Ti+Al 2 o 3 ) reinforced aluminum matrix composites.

[0025] figure 1 XRD pattern of cross-scale in-situ particle reinforced aluminum matrix composites, it can be seen that the main reinforcement phase is (Si+Al 3 Ti+Al 2 o 3 ).

[0026] figure 2 The SEM i...

Embodiment 2

[0030] It is required to prepare nano-Al 2 o 3 Particle volume fraction is 3%, micron (Si+Al 3 Ti) particle volume fraction of 9% cross-scale in-situ particle-reinforced aluminum matrix composites, the Al-15wt% Si alloy is melted, and SiO is added at 18wt% of the Al-Si alloy 2 Melt, heat up to 850°C, heat for 5 minutes and then refine, add 1% (P+S) composite modifier and cool down to 810°C, then use a frequency of 20kHz and a power density of 1200W / cm 2 Ultrasonic treatment of the melt for 15 minutes, adding 1.5wt% titanium powder and 0.5wt% rare earth while ultrasonic treatment, standing for 10 minutes, then removing slag, adjusting the temperature and pouring, and finally forming (Si+Al 3 Ti+Al 2 o 3 ) reinforced aluminum matrix composites.

[0031] Analysis showed that Al 2 o 3 、Al 3 The volume fractions of Ti and Si particles are 3.1%, 1.2%, and 8.0%, respectively. Under the test conditions of a load of 3.0MPa and a sliding speed of 200r / min, after quenching and l...

Embodiment 3

[0034] It is required to prepare nano-Al 2 o 3 Particle volume fraction is 4%, micron (Si+Al 3 Ti) The cross-scale in-situ particle reinforced aluminum matrix composite with a particle volume fraction of 4%, melted the Al-3wt% Si alloy, and added SiO at 25wt% of the Al-Si alloy 2 Melt, heat up to 830°C, heat for 8 minutes and then refine, add 0.6% P-Cu master alloy and cool down to 760°C, then use frequency 20kHz, power density 800W / cm 2 Ultrasonic treatment of the melt for 20 minutes, adding 2wt% titanium powder and 0.4wt% rare earth while ultrasonic treatment, standing for 8 minutes, then removing slag, adjusting the temperature and pouring, and finally forming (Si+Al 3 Ti+Al 2 o 3 ) reinforced aluminum matrix composites.

[0035] Analysis showed that Al 2 o 3 、Al 3 The volume fractions of Ti and Si particles are 3.9%, 1.6%, and 2.6%, respectively. Under the test conditions of a load of 2.0MPa and a sliding speed of 200r / min, after quenching and low temperature

[...

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Abstract

The invention relates to an in-situ particle reinforced aluminum matrix composite material, in particular to a cross-scale in-situ particle reinforced aluminum matrix composite material and a preparation method thereof. The method comprises the following steps of: melting Al-Si alloy; adding 10-25 percent by weight of SiO2 for melting according to proportioning requirement of volume fraction of reinforcing particles of different scales in the composite material; heating to 800-850 DEG C, preserving the heat for 5-10 minutes and then refining; subsequently performing ultrasonic treatment; adding 1-2 percent by weight of titanium powder and 0.3-0.5 percent by weight of rare earth during ultrasonic treatment; standing for 5-10 minutes; slagging off; adjusting temperature for pouring; and finally forming (Si+Al3Ti) microparticle and Al2O3 nanoparticle reinforced aluminum matrix composite material. The method has the advantages of simple preparation process, low cost, low overall reaction temperature and less aluminum burnt loss.

Description

technical field [0001] The invention relates to an in-situ particle reinforced aluminum-based composite material, in particular to a cross-scale in-situ particle-reinforced aluminum-based composite material and a preparation method thereof. technical background [0002] Particle-reinforced aluminum matrix composites can be divided into external particle-reinforced aluminum-matrix composites and in-situ particle-reinforced aluminum-matrix composites according to the source of reinforced particles; , particle surface pollution, poor particle-aluminum (alloy) matrix interface bonding, and brittle by-products are easily generated. The reinforced particles of aluminum matrix composite materials nucleate and grow in situ in the aluminum matrix through endogenous or reaction synthesis. The direct reaction method is to add solid particles or powders containing reinforced particle-forming elements to molten aluminum or aluminum alloy at a certain temperature to make them fully react...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C21/04B22D27/20
Inventor 陈刚赵玉涛张勇张振亚侯文胜
Owner JIANGSU UNIV
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