Preparation method of aluminum alloy material for semi-solid die casting of 5G cooling shell

A technology of aluminum alloy material and heat dissipation shell, applied in the field of recycled aluminum alloy, can solve the problems that will affect the structure and composition of aluminum alloy, affect production efficiency, long time, etc., and achieve the effect of improving market competitiveness and commercial value, and reducing application costs.

Pending Publication Date: 2021-07-23
FUJIAN KINRUI HIGH TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0004] At present, the commonly used method of removing Sr is mainly to let Sr oxidize and burn in the aluminum melt and remove it by slag removal, but this method takes a long time, about 4-6 hours, and will seriously affect production. efficiency, and increase energy costs
Another method is to combine B and Sr to form an intermetallic comp...
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Method used

The aluminum alloy material preparation method that is used for 5G cooling shell semi-solid die-casting, utilizes Sr element to produce chemical displacement reaction with AlF in high-temperature aluminum melt, thereby reach...
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Abstract

The invention relates to a preparation method of an aluminum alloy material for semisolid die casting of a 5G cooling shell. The preparation method comprises the following step I of collecting A356 aluminum alloy waste; and the step II of melting the A356 aluminum alloy waste collected in the step I in a smelting furnace, sampling and measuring the initial concentration of Sr in secondary aluminum; the step III of calculating the flux adding amount according to the initial concentration of the Sr, wherein the flux components comprise NaCl, KCl and AlF3; the step IV of putting the flux into a powder spraying tank according to the flux adding amount calculated in the step III, and completely spraying flux particles into the bottom of an aluminum melt by taking nitrogen as a carrier; the step V of letting the aluminum melt stand, and meanwhile removing dross on the surface of the aluminum melt; and the step VI of sampling and measuring the residual concentration of the Sr until the residual concentration of the Sr reaches a preset target, removing the Sr, and pouring into an aluminum ingot for later use. According to the method, materials with wide sources are utilized to regenerate and manufacture products with large market gaps, and the market competitiveness and commercial value of the preparation method are improved.

Technology Topic

DrossNitrogen gas +7

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  • Preparation method of aluminum alloy material for semi-solid die casting of 5G cooling shell

Examples

  • Experimental program(1)

Example Embodiment

[0022] Specific embodiments of the present invention will be described below.
[0023] Preparation method of aluminum alloy material for semi-solid die casting of 5G heat dissipation shell, using Sr element to combine with AlF in high temperature aluminum melt 3 A chemical replacement reaction occurs, so as to achieve the purpose of reducing the content of residual Sr elements. The method has high Sr removal efficiency, and can solve the problem of aluminum melt inhalation caused by high Sr content in the regenerated A356 aluminum alloy.
[0024] The chemical replacement reaction is: 1.5Sr + AlF 3 = 1.5SrF 2 + Al.
[0025] refer to figure 1 , the free energy of the reaction at different temperatures is figure 1 It can be seen that the free energy of the reaction in the range of 600-800 °C is all less than 0, indicating that the reaction formula can proceed to the right, that is, Sr can be replaced by Al.
[0026] After the reaction, the Sr element is converted into SrF 2 , AlF 3 converted to Al. SrF 2 The density is lower than that of aluminum water, and it will float to the surface of the aluminum melt in a molten state.
[0027] Specifically, the method for preparing an aluminum alloy material for semi-solid die casting of a 5G heat dissipation shell includes the following steps:
[0028] Ⅰ. Collect A356 aluminum alloy scrap.
[0029] Ⅱ. Melt the above-mentioned A356 aluminum alloy scrap collected in step I in a smelting furnace, raise the temperature of aluminum water to above 730°C, and take samples to measure the initial concentration of Sr in the regenerated aluminum.
[0030] Ⅲ. Calculate the amount of flux added according to the above initial Sr concentration. Among them, the flux components include NaCl, KCl, AlF 3 the flux.
[0031] Above-mentioned flux NaCl, KCl, AlF 3 Composition, the mass fraction ratio of the three is 40%: 50%: 10%, the flux is composed of NaCl, KCl, AlF 3 The particles are stirred and mixed.
[0032] The added amount of the flux is calculated from the initial Sr concentration and the preset Sr target concentration from the above displacement reaction equation.
[0033] Ⅳ. The flux is placed in the powder spray tank according to the amount of flux added in step III, and nitrogen is introduced into the powder spray tank to mix with the flux particles, and the flux particles are sprayed into the aluminum melt by using nitrogen as a carrier under certain pressure. until all the flux in the spray can is used up.
[0034] Ⅴ. Keep the temperature of aluminum water at 700℃ to 720℃, and let it stand for 20 minutes. The reaction product and residual flux will float up to the surface of the aluminum melt independently, and the scum on the surface of the aluminum melt will be removed.
[0035] Ⅵ. Sampling from the aluminum melt and measuring the residual Sr concentration with direct reading spectrum, until the residual Sr concentration reaches the preset target, complete the removal of Sr, and cast it into an aluminum ingot for use.
[0036] Specifically, the following is an example of the aluminum alloy material used to prepare the 5G heat dissipation shell from the recycled aluminum of the automobile wheel hub. The aluminum alloy brand used in this product is A356, which belongs to the hypoeutectic aluminum-silicon alloy. In order to improve the performance of the wheel hub, this type of aluminum alloy is used. About 250 ppm of Sr will be added in the preparation to modify the eutectic silicon phase. The source of the regenerated aluminum for the wheel hub is the defective product produced in the production process of the wheel hub enterprise.
[0037] The preparation method of the aluminum alloy material for semi-solid die casting of the 5G heat dissipation shell includes the following steps:
[0038] Ⅰ. Collect A356 aluminum alloy scrap.
[0039] II. Melt 1 ton of the above-mentioned A356 aluminum alloy scrap collected in step I in a smelting furnace, raise the temperature of aluminum water to 740°C, and sample and measure the initial Sr concentration in the regenerated aluminum to be 263 ppm.
[0040] Ⅲ. Calculate the amount of flux added according to the above initial Sr concentration. Among them, the flux components include NaCl, KCl, AlF 3 the flux. Above-mentioned flux NaCl, KCl, AlF 3 Composition, the mass fraction ratio of the three is 40%: 50%: 10%, the flux is composed of NaCl, KCl, AlF 3 The particles are stirred and mixed.
[0041] And the added amount of the flux is calculated from the initial Sr concentration of 263 ppm and the preset Sr target concentration of 20 ppm or less, calculated by the above replacement reaction equation, and the added amount of the flux is 1.2%.
[0042] Ⅳ. Place the flux in the powder spray tank according to the amount of flux added in step III, feed nitrogen into the powder spray tank to mix with the flux particles, control the nitrogen pressure of the powder spray tank at 2-2.5Mpa, start the powder spray tank, The flux particles are sprayed into the bottom of the aluminum melt with nitrogen as a carrier until all the flux in the spray can is used up.
[0043] Ⅴ. Keep the temperature of aluminum water at 700℃ to 720℃, and let it stand for 20 minutes. The reaction product and residual flux will float up to the surface of the aluminum melt independently, and the scum on the surface of the aluminum melt will be removed.
[0044] Ⅵ. Sampling from the aluminum melt, measuring the residual Sr concentration of 16 ppm by direct-reading spectroscopy, completing the removal of Sr, and pouring it into an aluminum ingot for use.

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