Method for preparing nano-alumina reinforced aluminum-based composite semi-solid slurry

A technology of nano-alumina and semi-solid slurry, which is applied in the field of preparation of semi-solid slurry for aluminum-based composite materials, can solve the problems of complex process, low content, and limited molding, and achieve low process cost, uniform distribution, The effect of easy operation

Active Publication Date: 2015-04-22
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of nanocomposites through traditional processes has problems such as easy aggregation of nanoparticles, low content, complex process, and limited molding, which will hinder its further development.

Method used

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  • Method for preparing nano-alumina reinforced aluminum-based composite semi-solid slurry

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Firstly, nano-alumina (100nm) was ultrasonically treated in absolute ethanol for 20 minutes, left to stand to remove absolute ethanol, dried at 150-200°C, and calcined at 550°C for 3 hours. The calcined nano-alumina is added with magnesium powder (75 μm) and ball-milled for 30 minutes, wherein the mass ratio of nano-alumina to magnesium powder is 1:7, and the ball-milling speed is 100 rpm; the A356 aluminum alloy is put into a crucible for heating and melting, at temperature At 700°C, the amount of nano-alumina added is 0.5wt.% of the aluminum alloy melt, and the above-mentioned mixed powder of nano-alumina and magnesium powder is added to the aluminum alloy melt at a rate of 0.2g / min , Introduce high-energy ultrasonic waves into the aluminum alloy melt during the addition process, ultrasonic frequency 10KHz, power 1000W, and then continue ultrasonic treatment for 5 minutes, ultrasonic frequency 20KHz, power 1000W; pour the melt into a crucible preheated at 600 °C, Cont...

Embodiment 2

[0014] Firstly, nano-alumina (100nm) was ultrasonically treated in absolute ethanol for 20min, left to stand to remove absolute ethanol, dried at 200°C, and calcined at 550°C for 3h. The calcined nano-alumina is added with magnesium powder (75 μm) and ball-milled for 60 minutes, wherein the mass ratio of nano-alumina and magnesium powder is 1:1, and the ball-milling speed is 100 rpm; the 7075 aluminum alloy is put into a crucible for heating and melting, at a temperature At 700°C, the amount of nano-alumina added is 1.5wt.% of the aluminum alloy melt, and the above-mentioned mixed powder of nano-alumina and magnesium powder is added to the aluminum alloy melt at a rate of 0.2g / min , Introduce high-energy ultrasonic waves into the aluminum alloy melt during the addition process, ultrasonic frequency 10KHz, power 1000W, and then continue ultrasonic treatment for 10min, ultrasonic frequency 20KHz, power 1000W; pour the melt into the crucible preheated at 650 °C, Control the tempe...

Embodiment 3

[0016] Firstly, nano-alumina (30nm) was ultrasonically treated in absolute ethanol for 25 minutes, then allowed to stand to remove absolute ethanol, dried at 200°C, and calcined at 550°C for 4 hours. The calcined nano-alumina was added with magnesium (58 μm) and ball-milled for 60 minutes, wherein the mass ratio of nano-alumina to magnesium powder was 3:7, and the ball-milling speed was 100 rpm; the 2017 aluminum alloy was heated and melted in a crucible, at a temperature of 800 At ℃, according to the addition of nano-alumina in an amount of 1.5wt.% of the aluminum alloy melt, the mixed powder of the above-mentioned nano-alumina and magnesium powder is added to the aluminum alloy melt at a speed of 0.3g / min. In the process of adding high-energy ultrasonic waves into the aluminum alloy melt, the ultrasonic frequency is 8KHz, the power is 1000W, and then the ultrasonic treatment is continued for 10 minutes, the ultrasonic frequency is 20KHz, and the power is 800W; the melt is pou...

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Abstract

The invention relates to a method for preparing nano-alumina reinforced aluminum-based composite semi-solid slurry. The method comprises the steps: firstly, carrying out ultrasonic treatment on nano alumina for 20-25 minutes in anhydrous ethanol, removing anhydrous ethanol, drying, calcining for 3-4 hours at the temperature of 550-600 DEG C, adding magnesium powder according to the mass ratio of (1: 7) to (5: 3), and carrying out ball milling for 30-60 minutes at the revolving speed of 100-150rpm so as to obtain mixed powder; melting aluminum alloy in a clay crucible so as to obtain aluminum alloy melt, adding the mixed powder into the aluminum alloy melt at the speed of 0.2-0.3g / min at the temperature of 700-800 DEG C in accordance with that the addition amount of the nano alumina is 0.5-2.5wt.% of the amount of the aluminum alloy melt, meanwhile, treating with high-energy ultrasonic sound of 5-10KHz and 1,000W, and then, continuing to treat with ultrasonic sound of 20KHz and 800-1,000W for 5-20 minutes; pouring the melt in the crucible of 600-650 DEG C, controlling the temperature to 700-720 DEG C, treating by applying ultrasonic sound of 20KHz and 600-1,000W, and cooling the alloy melt to a semi-solid temperature range at the cooling speed of 5-15 DEG C / min. According to aluminum-based nano composite material tissue prepared by the method, a newborn alpha-Al phase is fine and is uniform in distribution, nano alumina particles are uniform in distribution and are free from an agglomeration phenomenon, and the method is low in process cost and convenient in operation and is simple, safe and reliable.

Description

technical field [0001] The invention belongs to the field of metal material preparation, in particular to a method for preparing semi-solid slurry of aluminum-based composite materials. Background technique [0002] During the forming process, the semi-solid alloy has stable mold filling, low thermal stress, less shrinkage cavity and shrinkage defects, and a net near-formation. Particle-reinforced aluminum matrix composites have many advantages such as specific strength, high specific stiffness, and high wear resistance. Alumina (Al 2 o 3 ) is an ideal reinforcing phase because of its good physical, chemical, mechanical and thermal properties, and has attracted the attention of many scholars. Micron particles can improve the yield strength and ultimate compressive strength of the matrix, but make the ductility of the matrix worse. Nanoparticles can significantly improve the elastic modulus, yield strength, wear resistance and high temperature creep of the matrix while ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/10C22C21/00
Inventor 闫洪陈小会
Owner NANCHANG UNIV
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