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A method for preparing semi-solid slurry of nano-aluminum nitride particles reinforced aluminum matrix composites based on ultrasonic treatment

A technology of nano-aluminum nitride and semi-solid slurry, which is applied in the field of preparation of semi-solid slurry for aluminum-based composite materials. Uniform, finely distributed effect

Active Publication Date: 2016-12-07
重庆山渝道科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large number of studies have found that the wettability of nano-ceramic particles and aluminum alloy melt is poor, and the state in the melt is unstable
However, the preparation of nanocomposites through traditional processes has problems such as easy agglomeration of nanoparticles, low content, complex process, and limited molding, which greatly affects the potential for improving the performance of aluminum-based nanocomposites.

Method used

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  • A method for preparing semi-solid slurry of nano-aluminum nitride particles reinforced aluminum matrix composites based on ultrasonic treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, ball mill the nano-aluminum nitride particles and aluminum powder for 50 hours, wherein the mass ratio of nano-aluminum nitride particles to aluminum powder is 1:1, and the ball milling speed is 70rpm; put the mixed powder into a crucible for heating, and the temperature is controlled at 670 ℃; air cooling, crushing, and sieving, wherein the mesh size is 850 μm; put the 7075 aluminum alloy into the crucible to heat and melt, and at a temperature of 700 °C, the aluminum alloy melt is made according to the amount of nano-aluminum nitride particles added The amount of 1wt.% of the above-mentioned sieved mixed powder is added to the 7075 aluminum alloy melt for 5 minutes. During the addition process, high-energy ultrasound is introduced into the aluminum alloy melt. The ultrasonic frequency is 20KHz and the power is 2KW. Then continue the ultrasonic treatment for 5 minutes; reduce the melt temperature to 638°C, the cooling rate is 5°C / min, apply ultrasonic treatment d...

Embodiment 2

[0014] First, the nano-aluminum nitride particles and aluminum powder were ball milled for 55 hours, wherein the mass ratio of nano-aluminum nitride particles to aluminum powder was 1:1, and the ball milling speed was 60rpm; the mixed powder was heated in a crucible, and the temperature was controlled at 660 ℃; air cooling, crushing, and sieving, wherein the mesh size is 1000 μm; put the A356 aluminum alloy into the crucible to heat and melt, and at a temperature of 750 °C, the aluminum alloy melt is made according to the amount of nano-aluminum nitride particles added The amount of 2wt.% of the above-mentioned sieved mixed powder was added to the A356 aluminum alloy melt for 10 minutes. During the addition process, high-energy ultrasound was introduced into the A356 aluminum alloy melt with an ultrasonic frequency of 20KHz and a power of 1KW. , and then continue ultrasonic treatment for 10 minutes; reduce the melt temperature to 605°C, and the cooling rate is 15°C / min, apply u...

Embodiment 3

[0016] First, ball mill the nano-aluminum nitride particles and aluminum powder for 60 hours, wherein the mass ratio of nano-aluminum nitride particles to aluminum powder is 2:3, and the ball milling speed is 65rpm; put the mixed powder into the crucible for heating, and the temperature is controlled at 660 ℃; air cooling, crushing, and sieving, wherein the mesh size is 1000 μm; put 6063 aluminum alloy into a crucible to heat and melt, at a temperature of 700-750 °C, the amount of nano-aluminum nitride particles added is The amount of 3wt.% of the melt, the above-mentioned mixed powder after sieving is added to the 6063 aluminum alloy melt, the addition time is 10min, and high-energy ultrasound is introduced into the aluminum alloy melt during the addition process, the ultrasonic frequency is 20KHz, the power 3KW, and then continue ultrasonic treatment for 5min; reduce the melt temperature to 652°C, and the cooling rate is 10°C / min, apply ultrasonic treatment during this proces...

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Abstract

The invention relates to a method for preparing nano-aluminum-nitride particle reinforced aluminum-based composite semi-solid slurry based on ultrasonic treatment. The method comprises the steps: firstly, mixing nano aluminum nitride particles and aluminum powder according to the mass ratio of (1: 1) to (2: 3), carrying out ball milling for 50-60 hours at the revolving speed of 60-70rpm so as to obtain mixed powder, putting the mixed powder into a crucible, heating to the temperature of 660-670 DEG C, cooling with air, crushing and sieving; melting aluminum alloy in the crucible so as to obtain aluminum alloy melt, adding the sieved mixed powder into the aluminum alloy melt at the temperature of 700-750 DEG C in 5-10 minutes in accordance with that the addition amount of the nano aluminum nitride particles is 1-4wt.% of the amount of the aluminum alloy melt, introducing high-energy ultrasonic sound of 20KHz and 1-3KW, and then, continuing to carry out ultrasonic treatment for 5-10 minutes; cooling the melt to an alloy semi-solid temperature range at the cooling speed of 5-15 DEG C / min, and treating by applying ultrasonic sound of 20KHz and 600-1,000W. 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 aluminum nitride 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, high wear resistance, and high vibration damping. Aluminum nitride particles are an ideal reinforcement phase because of their good physical, chemical, mechanical and thermal properties, and have 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 tempe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/02C22C1/10C22C21/00
Inventor 闫洪陈小会
Owner 重庆山渝道科技有限公司