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Al-Ti-B-Er refiner and preparation method thereof

An al-ti-b-er, refiner technology, applied in the field of aluminum alloy rare earth refiner, can solve the problems of loss of refinement ability, loss of refinement ability, easy aggregation of particles, etc., to improve the shape and distribution , improve refinement efficiency, and solve the effect of easy aggregation

Active Publication Date: 2014-06-18
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For some shortcomings of commonly used Al-Ti-B refiners: TiB 2 Particles are easy to aggregate and precipitate and lose the ability to refine; B is prone to poisoning reactions with Cr and Zr and loses the ability to refine; TiB in commonly used refiners 2 、TiAl 3 Particles, which can become effective heterogeneous nucleation cores, are less than 1%, and the refinement ability needs to be improved

Method used

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  • Al-Ti-B-Er refiner and preparation method thereof
  • Al-Ti-B-Er refiner and preparation method thereof
  • Al-Ti-B-Er refiner and preparation method thereof

Examples

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Effect test

Embodiment 1

[0020] The process of preparing Al-5Ti-1B-0.1Er refiner by self-propagating reaction method is as follows:

[0021] 1. Raw material preparation, refiner consists of aluminum ingot, aluminum powder, titanium powder, boron powder, Al-Er master alloy, C 2 Cl 6 and cryolite covering agent preparation. Among them, the purity of the aluminum ingot is 99.9%, and the powder particle size is 325 mesh for Ti powder and 300 mesh for B powder.

[0022] 2. Prepare 1Kg of refiner, weigh boron powder, titanium powder, aluminum powder, Al-Er master alloy, aluminum ingot as required, and the aluminum burning loss rate is 3%. It is required that Ti / B=5 (wt%); the molar ratio of aluminum powder to titanium powder is 3.

[0023] 3. Mix titanium powder, aluminum powder, and boron powder evenly, place the evenly mixed powder in a mold, apply a pressure of 10MPa, and press it into a cylindrical powder block of φ40×50.

[0024] 4. Cryolite and C 2 Cl 6 Heat at 100°C for 1h to remove moisture. ...

Embodiment 2

[0028] Preparation of Al-5Ti-1B-0.2Er refiner by self-propagating reaction at 800℃

[0029] The aluminum ingot, aluminum powder, titanium powder, boron powder, and Al-Er master alloy will be proportioned according to the composition requirements. Press the required powder into a cylindrical powder block of φ40×50.

[0030] Heat the cleaned aluminum ingot to 780°C with a well-type resistance furnace. After the aluminum ingot is completely melted, cover it with a layer of cryolite to prevent the oxidation and gas absorption of aluminum; first wrap the Al-Er intermediate alloy with aluminum foil, and graphite clock Press the cover into the molten aluminum and let it stand for 5 minutes until the intermediate alloy is completely dissolved and spreads evenly; raise the furnace temperature to 800°C, press the cylindrical powder block that has been pressed in advance into the molten aluminum with the graphite bell, and stir the graphite rod evenly. Make it a combustion reaction, rea...

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Abstract

The invention discloses an Al-Ti-B-Er refiner and a preparation method thereof and belongs to the technical field of refiners. The Al-Ti-B-Er refiner comprises the following components in weight percentage: 3.0-10.0 percent of Ti, 0.6-2 percent of B, 0.1-0.3 percent of Er and the balance of Al, wherein the weight ratio of the Ti to the B is 5 / 1. The phase composition comprises alpha-Al, TiAl3, TiB2, Al3Er and AlErTi. The preparation method comprises the following steps of: weighing boron (B) powder, titanium (Ti) powder, aluminum (Al) powder, an Al-Er intermediate alloy and an aluminum ingot as required, wherein the weight ratio of the titanium (Ti) powder to the boron (B) powder is 5, the molar ratio of the aluminum (Al) powder to the titanium (Ti) powder is 2.5-3.0, and the purity of the aluminum ingot is 99.9 percent; evenly mixing the Ti, the Al with the B; putting in a mould; pressing into a block; heating to melt the aluminum ingot; covering by kryocide; pressing in the Al-Er intermediate alloy; standing; heating a melt; pressing in the block; performing stirring reaction; pressing in C2Cl6 for refining; drossing and pouring. According to the Al-Ti-B-Er refiner disclosed by the invention, the problem that the TiB2 can be easily gathered is solved, and the refining efficiency is increased.

Description

technical field [0001] The invention belongs to the technical field of refiners, in particular to an aluminum alloy rare earth refiner. Background technique [0002] Grain refinement methods mainly include mechanical method, controlled supercooling, and adding grain refiner. Adding a refiner has the advantages of simple operation and low cost, and is widely used in industrial production. For some shortcomings of commonly used Al-Ti-B refiners: TiB 2 Particles are easy to aggregate and precipitate and lose the ability to refine; B is prone to poisoning reactions with Cr and Zr and loses the ability to refine; TiB in commonly used refiners 2 、TiAl 3 Particles that can become effective heterogeneous nucleation cores account for less than 1%, and the refinement ability needs to be improved. In recent years, research at home and abroad has found that rare earths such as Sc and La have the effect of refining grains. The main reason is that rare earth elements have a large segr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/00C22C1/00
Inventor 陈子勇马腾飞聂祚仁黄晖
Owner BEIJING UNIV OF TECH
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