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Process for solidifying and shaping AlTiC alloy wire as fining agent

A technology of alloy wire and refiner, which is applied in the smelting and metallurgical process of aluminum-titanium-carbon refiner alloy, and in the field of wire rod processing and forming technology, can solve the problems of fine particle poisoning, long process flow, and uneven distribution of compounds. To achieve the effect of protecting the environment

Inactive Publication Date: 2004-04-07
温景林 +2
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  • Application Information

AI Technical Summary

Problems solved by technology

In the preparation of aluminum-titanium-carbon refiner alloy, the metallurgical synthesis method of adding fluorine salt and carbon powder or titanium and carbon powder to aluminum liquid is usually used. Due to the poor wettability of carbon and molten aluminum, the carbon The yield decreases, the interface reaction is slow, and the stability of the alloying process becomes poor. At the same time, the kinetics and thermodynamics factors of the conventional aluminothermic reaction make it difficult to achieve the preparation conditions of the master alloy with good refining activity, and often appear the finer particles poisoning phenomenon, thereby losing the effective tissue refinement effect
The existing aluminum-titanium-carbon alloy is made of the traditional rolling method. This method has problems such as long process flow, high production cost, uneven distribution of compounds in the alloy structure of the refiner wire rod, and unstable refinement activity.

Method used

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Examples

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Effect test

example 1

[0007] Example 1. The preparation method of φ9.5~φ10mm Al-6%Ti-0.2%C typical refiner alloy wire: add 100 grams of fluoride salt into flux and mix evenly with 15 grams of activated graphite powder with an average particle size of 20 microns. After that, thermal activation treatment is carried out at a certain temperature, and it is directly added to the aluminum melt which is superheated to 1000°C for solid-liquid reaction for 5 to 10 minutes. The alloy structure is evenly distributed, and the melt is transferred to the tundish for heat activation treatment, and then heat preservation treatment, in the process parameters (casting extrusion process parameters: casting extrusion speed is 10m / min, cooling water content is 0.6 / m 3 / n) Under the premise of real-time optimization, the continuous casting extrusion machine is used to solidify and form the melt to make φ9.5~φ10mm wire rod

example 2

[0008] Example 2.Preparation method of φ9.5mm alloy wire rod with other components of refiner: Al-Ti-C refiner alloy was further prepared basically according to the method of Example 1. The content of carbon and titanium was different, and the alloy composition was as follows: Al-(3~8 )Ti-(0.1~1)C.

[0009] Example 3. The grain refinement effect of refiner alloy wire rod: Al-Zn-Mg (ASTM7075) alloy containing 0.1% Zr and 0.1% Cr is carried out with Al-6Ti-0.2C refiner alloy After the grain refinement treatment, the as-cast structure is obviously refined when 0.1% to 0.2% refiner alloy is added. For industrial pure aluminum, when 0.2% refiner alloy is added, the average grain size is 155 μm; For 7075 alloy, when adding 0.2% refiner alloy, an average grain size of 165 μm can be obtained.

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Abstract

A technology for preparing the Al-Ti-C alloy wire incldues such steps as adding flux to fluorine salt for activating graphite, stirring while adding Ti and C sources to overheat molten aluminium, solid-liquid reaction, removing salt, refining, degassing, stirring for further dispersing TiC and TiAl3 particles, heating to 1000-1300 deg.C, fining, stabilizing activity, and casting-extruding by casting extruder.

Description

Technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a smelting and metallurgical process of an aluminum-titanium-carbon refiner alloy and a processing and forming process of wire rods. Background technique [0002] Al-Ti-C grain refiner is an important material to ensure and improve the quality of aluminum production. In the preparation of aluminum-titanium-carbon refiner alloy, the metallurgical synthesis method of adding fluorine salt and carbon powder or titanium and carbon powder to aluminum liquid is usually used. Due to the poor wettability of carbon and molten aluminum, the carbon The yield decreases, the interface reaction is slow, and the stability of the alloying process becomes poor. At the same time, the kinetics and thermodynamics factors of the conventional aluminothermic reaction make it difficult to achieve the preparation conditions of the master alloy with good refining activity, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/10C22C21/00
Inventor 温景林李英龙孝云祯陈彦博李体彬马宏声
Owner 温景林