Method for preparing particle-reinforced aluminum-based composite material from cuttings of aluminum or aluminum alloy

Abstract

The invention relates to a method for preparing particle-reinforced aluminum-based composite materials from cuttings of aluminum or aluminum alloy. The method is characterized by comprising the following steps of: crushing the cuttings of aluminum or aluminum alloy until the grain size is 0.5 to 10.0 mu m by a mechanical crushing method; drying at the temperature of between 250 and 350 DEG C for 20 to 30 minutes so as to dehydrate and deoil; performing magnetic separation on the dried cuttings of aluminum or aluminum alloy to remove iron; throwing into aluminum melt at the temperature of between 750 and 800 DEG C in a set proportion; dispersing aluminum cuttings uniformly through mechanical agitation and performing ultrasonic treatment for 10 to 20 minutes at the same time, so that gama-AL2O3 particles of the oxide film on the surface of the cuttings of the aluminum and aluminum alloy are converted into alpha-Al2O3 particles; standing for 5 to 10 minutes after the melt is subjected toultrasonic treatment; drossing and adjusting the temperature of the melt; and casting and cooling to obtain the alpha-Al2O3 particle-reinforced aluminum-based composite material. By the method, active ingredients of the aluminum cuttings can be utilized completely and the utilization ratio of the aluminum cuttings can be increased greatly. The method is simple in operation and high in adaptability.

Description

technical field [0001] The invention relates to a recycling method of aluminum or aluminum alloy, in particular to a method for preparing particle-reinforced aluminum-based composite material by using aluminum or aluminum alloy cuttings. technical background [0002] A large amount of aluminum shavings are produced during the machining of aluminum alloy parts. Usually, the aluminum shavings during cutting process account for 20% of the total mass of the part, up to about 30%. Therefore, effective recycling of aluminum shavings during the machining process of aluminum alloy parts can reduce production costs , has significant economic and social benefits; at present, the main way to recycle aluminum scrap is remelting: generally, aluminum scrap is directly added to aluminum or aluminum alloy melt after simple treatment, and the aluminum burning loss is large, and the quality of aluminum alloy The advanced aluminum scrap remelting production line is relatively complicated, main...

AI Technical Summary

Problems solved by technology

[0003] Due to its small size and large specific surface area, aluminum scraps are severely oxidized, which also causes certain difficulties in recycling. Aluminum is a relatively active metal, and its standard potential- 1.66V, a layer of oxide film with a thickness of about 0.01 to 0.1 microns can be naturally formed in the air. This oxide film is amorphous, thin and porous, and has poor corrosion resistance. However, studies have shown that aluminum begins to oxidize at 140 ° C. γ-Al2O3 begins to be formed above 300°C, and continues until about 515°C. From 773°C, γ-Al2O 3 transforms into α-Al2O3, α-Al2O3 at 800℃ begins to grow and lasts until 1097°C. The α-Al2O3 formed on the surface is at the nanoscale. During the entire heating process, the oxidation of aluminum is dominant Status, completely transformed into α-Al2O3 needs to be above 1100~1200℃

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