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Al-Ti-C-Er refiner and preparation method

A technology of al-ti-c-er and refiner, which is applied in the field of rare earth refiner and preparation of aluminum alloy, can solve the problem of limiting the wide application of Al-Ti-C grain refiner, increasing the preparation cost, wetting It can improve the morphology and distribution, improve the refining efficiency, and improve the wettability.

Active Publication Date: 2012-11-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor wettability of C in Al, the preparation is very difficult. The Al-Ti-C grain refiner is prepared by strong stirring or high temperature reaction, which increases the preparation cost and limits the grain refinement of Al-Ti-C. Wide application of the agent

Method used

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  • Al-Ti-C-Er refiner and preparation method

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Embodiment 1

[0019] The process of preparing Al-5Ti-0.3C-0.2Er refiner by self-propagating reaction method is as follows:

[0020] 1. Raw material preparation, refiner consists of aluminum ingot, aluminum powder, titanium powder, graphite powder, Al-Er master alloy, C 2 Cl 6 and cryolite covering agent preparation. Among them, the purity of aluminum ingot is 99.9%, the powder particle size is 325 mesh for Ti powder, and 300 mesh for C powder.

[0021] 2. Prepare 1Kg of refiner, weigh graphite powder, titanium powder, aluminum powder, Al-Er master alloy, and aluminum ingot as required, and the aluminum burning loss rate is 3%. It is required that Ti / C=50 / 3 (wt%); the powder accounts for 60% of the mass of the powder block (the mass of aluminum powder is 78g).

[0022] 3. Mix titanium powder, aluminum powder and graphite powder evenly, place the mixed powder in a mold, apply a pressure of 10MPa, and press it into a cylindrical powder block of φ40×50.

[0023] 4. Cryolite and C 2 Cl 6 H...

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Abstract

The invention relates to an Al-Ti-C-Er refiner and a preparation method and belongs to the technical field of refiners. The Al-Ti-C-Er refiner comprises 3.0-10.0 wt% of Ti, 0.15-0.5 wt% of C, 0.1-0.3 wt% of Er and the balance of Al; the mass ratio of Ti to C is 17 to 22; and the phase of the refiner comprises alpha-Al, TiAl3, TiC, Al3Er, and AlErTi ternary phase. The preparation method comprises the following steps: uniformly mixing Ti, Al and graphite powder, placing the mixture in a mold, and pressing the mixture into blocks; heating and melting an aluminium ingot and covering cryolite; pressing in an Al-Er intermediate alloy and standing; and heating the melt to the required reaction temperature, pressing in the blocks, stirring for reaction, pressing in C2Cl6 for refining, slagging off and pouring. The Al-Ti-C-Er refiner solves the problem of difficult preparation of TiC particles, improves the wettability of C in Al by adding rare earth Er, and also improves the reaction efficiency.

Description

technical field [0001] The invention belongs to the technical field of refiners, in particular to an aluminum alloy rare earth refiner and a preparation method. Background technique [0002] Adding a grain refiner can not only refine the as-cast grains and dendrite structure, but also reduce porosity, reduce hot cracking tendency, reduce casting defects, and improve subsequent processing performance. In recent years, with the research on aluminum alloy refiners, Al-Ti-C grain refiners have been developed. The TiC particle size in the Al-Ti-C grain refiner is small, not easy to aggregate, evenly distributed, and has good coherence with Al, and has attracted widespread attention. Due to the poor wettability of C in Al, the preparation is very difficult. The Al-Ti-C grain refiner is prepared by strong stirring or high temperature reaction, which increases the preparation cost and limits the grain refinement of Al-Ti-C. wide application of agents. Rare earth elements are surf...

Claims

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Application Information

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IPC IPC(8): B22D27/20C22C1/06
Inventor 陈子勇马腾飞聂祚仁黄晖
Owner BEIJING UNIV OF TECH
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