Low-cost and high-efficiency Al-Ti-C-Ce refining agent and preparation method thereof

A technology of al-ti-c-ce and refining agent, applied in the field of low-cost and high-efficiency Al-Ti-C-Ce refining agent and its preparation, can solve the problem of fluorine salt inclusions affecting the metallurgical quality of refining agent, fluorine Environmental pollution caused by compound gas, high preparation temperature, etc., to achieve the effect of shortening the reaction preparation time, lowering the preparation reaction temperature, and reducing the preparation cost

Active Publication Date: 2015-04-22
力同铝业(青海)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the developed preparation method still has some disadvantages, such as when potassium fluorotitanate is used to introduce Ti element, a large amount of fluoride gas will be generated during the preparation process to pollute the environment, corrode equipment, and easily form fluorine salt inclusions to affect the fineness of the refiner. Metallurgical quality; in addition, the preparation temperature is re

Method used

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  • Low-cost and high-efficiency Al-Ti-C-Ce refining agent and preparation method thereof
  • Low-cost and high-efficiency Al-Ti-C-Ce refining agent and preparation method thereof
  • Low-cost and high-efficiency Al-Ti-C-Ce refining agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0040] The process of preparing Al-Ti-C-Ce refiner by thermal explosion method of aluminum melt is as follows:

[0041] (1) Raw material preparation, refiner is prepared from aluminum powder, titanium powder, graphite powder, aluminum ingot, cerium ingot. Weigh aluminum powder, titanium powder, graphite powder, aluminum ingot, and cerium ingot according to the composition requirements. The molar ratio of aluminum powder to titanium powder and graphite powder is required to be 1:0.8:0.4; the purity of aluminum ingot is 99.9%, and the purity of cerium ingot is 99.9%. ;Powder particle size: Al powder 200 mesh, Ti powder 350 mesh, C powder 400 mesh.

[0042] (2) Mix aluminum powder, titanium powder and graphite powder evenly, place the mixed powder in a mold, apply a pressure of 60MPa, and press it into a cylindrical block of φ25×50.

[0043] (3) Use graphite crucible for melting and graphite rods to stir to prevent Si pollution. Use a well-type resistance furnace to heat the ...

Embodiment 2

[0047] The difference between embodiment 2 and embodiment 1 is:

[0048] In step (1), the molar ratio of aluminum powder to titanium powder and graphite powder is 1:0.2:0.6;

[0049] In step (3), the cleaned aluminum ingot is heated to 780°C using a well-type resistance furnace. After the aluminum ingot is completely melted, the graphite bell jar is simultaneously pressed into the cerium ingot and the step (2) block; after the reaction is completed, statically Set aside for 8 minutes, manually stir the melt with a graphite rod every 1 minute, and stir 8 times;

[0050] In step (4), the preheating temperature of the filter box is 450°C.

Embodiment 3

[0052] The difference between embodiment 3 and embodiment 1 is:

[0053] In step (1), the molar ratio of aluminum powder to titanium powder and graphite powder is 1:0.4:0.1;

[0054] In step (3), the cleaned aluminum ingot is heated to 850°C using a well-type resistance furnace. After the aluminum ingot is completely melted, the graphite bell jar is simultaneously pressed into the cerium ingot and the step (2) block; after the reaction is completed, statically Set aside for 6 minutes, manually use a graphite rod to stir the melt once every 1 minute, and stir 6 times;

[0055] In step (4), the preheating temperature of the filter box is 550°C.

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Abstract

The invention provides a low-cost and high-efficiency Al-Ti-C-Ce refining agent comprising the following components in percentage by mass: 4.0-16.0% of Ti, 0.5-3.0% of C, 0.5-2.0% of Ce and the balance of Al; and a material phase composition of the refining agent comprises alpha-Al, TiAl3, TiC and Ti2Al20Ce. The Al-Ti-C-Ce refining agent provided by the invention is prepared by adopting an aluminum melt thermal explosion method, and the aluminum melt thermal explosion method mainly comprises the following process steps: (1) preparing raw materials: weighing aluminum powder, titanium powder, graphite powder, aluminum ingots and cerium ingots according to component requirements; (2) uniformly mixing the aluminum powder, the titanium powder and the graphite powder, and pressing to form blocks; (3) heating and melting the aluminum ingots, and then synchronously pressing the cerium ingots and the blocks prepared in the step (2) into aluminum melts by using a graphite clock cover to perform reaction; and (4) filtering the melts, removing molten slag, and casting to obtain Al-Ti-C-Ce refining agent products.

Description

technical field [0001] The invention belongs to the technical field of refiners, and relates to a low-cost and high-efficiency Al-Ti-C-Ce refiner and a preparation method thereof. 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 particles in the Al-Ti-C grain refiner have been widely concerned because of their small size, difficulty in agglomeration, uniform distribution, and good coherence with Al. However, 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, and the preparation cost is high, which limits the Al-Ti-C grain refinement. Extensive application of ch...

Claims

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Application Information

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IPC IPC(8): C22C1/06C22C21/00C22C1/02
Inventor 丁万武赵文军夏天东许天鹏李庆林徐仰涛
Owner 力同铝业(青海)有限公司
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