Preparation method of Al-Ti-B-C quaternary grain refiner

A grain refiner, al-ti-b-c technology, applied in the preparation of grain refiner, Al-Ti-B-C quaternary grain refiner, can solve the problem of increasing aluminum melt Wettability with boron carbide, lower reaction temperature, shorten preparation time of refiner, etc., to achieve the effect of shortening response time of refinement, lowering reaction temperature and shortening reaction preparation time

Inactive Publication Date: 2012-10-03
SHANGHAI JIAO TONG UNIV
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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies and defects of the existing above-mentioned preparation technology of Al-Ti-B-C quaternary grain refiner, use boron carbide and sponge titanium instead of toxic fluoride as reaction raw materials, and avoid harmful waste residues in traditional processes pollution and treatment probl

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  • Preparation method of Al-Ti-B-C quaternary grain refiner

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Embodiment 1-5

[0021] (1) According to the production weight percentage: 1.00-12.00% Ti, 1.00-4.00% B, 0.25-1.00% C, the balance is Al, weigh the sponge titanium, boron carbide powder and industrial pure aluminum, and mix the sponge titanium and carbonized Boron powder is evenly mixed;

[0022] (2) Heat up the temperature to 800°C-900°C to melt the weighed industrial pure aluminum in a resistance furnace;

[0023] (3) Press the prepared titanium sponge and boron carbide mixed powder into the aluminum melt using a graphite bell jar;

[0024] (4) Introduce ultrasonic waves with a frequency of 20±1kHz and a power of 500-5000W from the upper part of the melt, and continue the treatment for 1-15 minutes;

[0025] (5) Allow the melt to cool naturally, and when it is cooled to 700-780°C, cast it into an ingot-shaped Al-Ti-BC quaternary grain refiner.

[0026] Refining: 500 grams of industrial pure aluminum, heating and melting to 720 ° C, adding the prepared Al-Ti-BC quaternary grain refiner acco...

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Abstract

The invention discloses a preparation method of an Al-Ti-B-C quaternary grain refiner. The preparation method comprises the following steps: according to generation weigh percentage of 1.00-12.00% of Ti, 1.00-4.00% of B, 0.25-1.00% of C and the balance of Al, uniformly mixing sponge titanium powder and boron carbide powder; warming and melting commercially pure aluminum; pressing a mixture of sponge titanium powder and boron carbide powder into molten aluminum; introducing continuous ultrasonic treatment on upper portion of the molten aluminum; and naturally cooling molten aluminum to obtain the Al-Ti-B-C quaternary grain refiner. The preparation method provided by the invention can prevent toxic fluoride gases discharging in traditional preparation reactions, reduce reaction temperature, reduce oxidative damages of molten aluminum, quicken reaction between boron carbide and solute titanium, greatly shorten reaction preparation time, improve a distribution state of a middle phase of the grain refiner, and reduce refining response time; grain size of commercially pure aluminum in cast condition of prepared materials provided by the invention is less than 150 microns.

Description

technical field [0001] The invention relates to a preparation method of a grain refiner in the field of metal materials, in particular to a preparation method of an Al-Ti-BC quaternary grain refiner. Background technique [0002] Al-Ti-B and Al-Ti-C master alloys are excellent grain refiners for aluminum alloys, especially Al-Ti-B master alloys have been widely used in actual industrial production. The main reason for its grain refinement is the excellent nucleation substrate TiB in the refiner. 2 or TiC, and the excess solute Ti has a significant inhibitory effect on the grain growth of Al. However, TiB in Al-Ti-B master alloy 2 Particles are easy to agglomerate, which leads to some quality problems, such as: pinhole defects in aluminum foil and strip defects in anodized sheets; in addition, elements such as Zr, Cr, and Si can also cause TiB 2 The surface is "poisoned", so that the thinning performance declines rapidly. The TiC particles in the Al-Ti-C master alloy are ...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/00
Inventor 韩延峰张森王俊孙宝德
Owner SHANGHAI JIAO TONG UNIV
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