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Preparation method of submicron particle-reinforced aluminum-based composite material

A technology of submicron particles and reinforced aluminum matrix is ​​applied in the field of preparation of submicron particle reinforced aluminum matrix composite materials, which can solve problems such as limiting flexible application, and achieve the effects of improving high temperature resistance, improving service life and preventing deterioration of melt quality.

Inactive Publication Date: 2011-07-27
江苏中欧材料研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is limited to the coupling effect of the two physical fields, which greatly limits the flexible application of specific systems. In addition, under the coupling effect of the magnetic field and the ultrasonic field, higher requirements are placed on the high temperature corrosion resistance of the horn.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] ZrO 2 +B 2 o 3 (Zr, B molar ratio 1:2) The powder is dried at 150~200°C for 2 hours, and the baked powder is ground and sieved for later use. After the 7055 aluminum alloy ingot is melted in the aluminum melting furnace, a covering agent is added to protect it from oxidation, the temperature is raised to 900°C, the surface covering is removed, and the aluminum alloy liquid is filled with 2wt% ZrO 2 +B 2 o 3 Cover the powder with aluminum foil and add it to the aluminum alloy melt, start the low-frequency stirring magnetic field, the magnetic field parameters are frequency 3Hz, current 150A; after the magnetic field is stable, extend the ultrasonic horn 5mm below the melt surface, and the high-energy ultrasonic parameters are Frequency 20kHz, ultrasonic intensity 0.8kW / cm 2 , and continuously act for 3 minutes. After the reaction, cool down, refine, remove slag, and at the same time add a covering agent to protect against oxidation. When the melt temperature reaches...

Embodiment 2

[0022] Other preparation conditions remain unchanged, the high-energy ultrasound is changed to intermittent application, the horn is taken out of the melt every 30s, and the horn is applied again after an interval of 30s until the cumulative application time reaches 3min. Add a covering agent to protect against oxidation. When the melt temperature reaches the pouring temperature, it is poured into a water-cooled copper mold with a diameter of 100mm to obtain a composite material ingot. The surface is smooth, the internal structure is dense, there is no solidification structure defect such as porosity and shrinkage cavity, and the particle size is 0.2~0.4 mu m.

Embodiment 3

[0024] Will B 2 o 3 + K 2 ZrF 6 (Zr, B molar ratio 1:1) The powder is dried at 150~200°C for 2 hours, and the baked powder is ground and sieved for later use. After the 7055 aluminum alloy ingot is melted in the aluminum melting furnace, a covering agent is added to protect it from Oxidation, heating up to 900°C, removing the surface covering, adding 5wt.% of the aluminum alloy liquid to the B 2 o 3 + K 2 ZrF 6 The powder is covered with aluminum foil and added to the aluminum alloy melt, and the low-frequency stirring magnetic field is started. The magnetic field parameters are frequency 3Hz, current 150A; after the magnetic field acts for 3 minutes, the magnetic field is turned off, and the ultrasonic horn is extended to 5mm~6mm below the melt surface. High-energy ultrasound parameters are frequency 20kHz, ultrasound intensity 1.2kW / cm 2 , apply an ultrasonic field for 7 minutes, cool down after the reaction, refine, remove slag, and add a covering agent to protect ag...

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Abstract

The invention provides a preparation method of a submicron particle-reinforced aluminum-based composite material, belonging to the technical field of preparation of metal-based composite materials. The method comprises the steps of: refining an aluminum melt or an aluminum alloy melt and then adjusting to a reaction starting temperature; adding a reactant which can have in-situ reaction with the aluminum melt or the aluminum alloy melt to generate particle phase so as to carry out synthetic reaction; applying high-energy ultrasound and low-frequency stirring magnetic field during the synthetic reaction; and standing to a pouring temperature and carrying out pouring after the reaction is finished, wherein the high-energy ultrasound and low-frequency stirring magnetic field are applied at the same time and the high-energy ultrasound is applied intermittently. When an intermittent application manner is adopted, the service life of a amplitude transformer can be prolonged and the quality deterioration of the melt caused by the introduction of impurity elements due to the corrosion of the amplitude transformer is prevented; and the size of the generated particles is smaller than that generated by other manners so that the manner has the function of thinning and reinforcing the particles and is beneficial to improvement of the mechanical property of the submicron particle-reinforced aluminum-based composite material.

Description

technical field [0001] The invention relates to the technical field of preparation of particle-reinforced aluminum-based composite materials, in particular to a method for preparing sub-micron particle-reinforced aluminum-based composite materials. Background technique [0002] Aluminum matrix composites have the advantages of high specific strength, specific stiffness, excellent high-temperature mechanical properties, low thermal expansion coefficient and good wear resistance, and have broad application prospects in aerospace, automotive, electronics, optics, sports and other fields. , because of the advantages of low cost of reinforcement, uniform microstructure, isotropic material properties, and can be processed by traditional metal processing technology, particle reinforced aluminum matrix composites have the prospect of industrial production and have attracted much attention, especially The composite material prepared by in-situ reaction synthesis technology has the ad...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/10
Inventor 赵玉涛董洪标张钊陈登斌陈刚
Owner 江苏中欧材料研究院有限公司
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