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Method for preparing nano-aluminum-nitride reinforced aluminum-based composite semi-solid slurry based on ultrasonic and mechanical vibration combination

A nano-aluminum nitride and semi-solid slurry technology is applied in the field of preparation of aluminum-based composite material semi-solid slurry, which can solve the problems of complex process, limited molding and low content, and achieves low process cost, convenient operation, Evenly distributed effect

Active Publication Date: 2015-04-22
DE RUISEN NANTONG COMPOSITE MATERIAL CO LTD
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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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  • Method for preparing nano-aluminum-nitride reinforced aluminum-based composite semi-solid slurry based on ultrasonic and mechanical vibration combination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] First, mix the nano-aluminum nitride particles and aluminum powder for ball milling for 60 hours, wherein the mass ratio of nano-aluminum nitride particles to aluminum powder is 2:3, and the ball milling speed is 70rpm; put the mixed powder into the crucible for heating, and the temperature is controlled at 660°C; air cooling, crushing, and sieving, the mesh size of which is 850μm; put the 7075 aluminum alloy into the crucible to heat and melt, at a temperature of 700°C, the amount of nano-aluminum nitride particles added is the aluminum alloy melting The amount of 1wt.% of the body, the above-mentioned mixed powder after sieving is added to the 7075 aluminum alloy melt, the addition time is 5min, and high-energy ultrasound is introduced into the aluminum alloy melt during the addition process, the ultrasonic frequency is 20KHz, and the power is 1KW , and then continue ultrasonic treatment for 5 minutes; reduce the melt temperature to 635 ° C, the cooling rate is 5 ° C / ...

Embodiment 2

[0014] First, mix the nano-aluminum nitride particles and aluminum powder for ball milling for 50 hours, wherein the mass ratio of nano-aluminum nitride particles to aluminum powder is 1:1, and the ball milling speed is 60rpm; put the mixed powder into a crucible for heating, and the temperature is controlled at 670°C; air cooling, crushing, and sieving, the mesh size of which is 1000μm; put the 6063 aluminum alloy into the crucible to heat and melt, at a temperature of 750°C, the amount of nano-aluminum nitride particles added is the aluminum alloy melting The amount of 2wt.% of the body, 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, and the power is 2KW , and then continue ultrasonic treatment for 5 minutes; reduce the melt temperature to 652 ° C, the cooling rate is 10 ° C ...

Embodiment 3

[0016] First, mix the nano-aluminum nitride particles and aluminum powder for ball milling for 60 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 660°C; air-cooled, crushed, and sieved, with a mesh size of 850 μm; put the A356 aluminum alloy into a crucible to heat and melt, and at a temperature of 700°C, the amount of nano-aluminum nitride particles added is The amount of 1wt.% of the body, the above-mentioned mixed powder after sieving is added to the A356 aluminum alloy melt, the addition time is 5min, and high-energy ultrasound is introduced into the aluminum alloy melt during the addition process, the ultrasonic frequency is 20KHz, and the power is 1KW , and then continue ultrasonic treatment for 5 minutes; reduce the melt temperature to 605 ° C, the cooling rate is 15 ° C / min, this process is applied mech...

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Abstract

The invention relates to a method for preparing nano-aluminum-nitride reinforced aluminum-based composite semi-solid slurry based on ultrasonic and mechanical vibration combination. 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), and 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, and 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, meanwhile, 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 applying mechanical vibration treatment at the power of 1.5KW, the frequency of 400-600Hz and the amplitude of vibration of 0.5-1.5mm. 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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IPC IPC(8): C22C1/10C22C21/00
Inventor 闫洪陈小会
Owner DE RUISEN NANTONG COMPOSITE MATERIAL CO LTD
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