Grain refining agent as well as preparation method and application thereof

A grain refiner and refiner technology are applied in the field of grain refiner and its preparation, which can solve the lack of ideal refiner, restrict the application of aluminum-silicon alloys and magnesium-aluminum alloys, and lose refined crystals. particles, etc.

Active Publication Date: 2019-01-11
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for aluminum-containing magnesium alloys, the Zr element will react with the aluminum element in the alloy to form a compound, thus losing the effect of refining the grains, and the Al-Ti-B refiner will increase with time, and serious fine grains will appear. recession
All in all, due to the lack of ideal refiners, the industrial application of aluminum-silicon alloys and magnesium-aluminum alloys has been severely restricted.

Method used

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  • Grain refining agent as well as preparation method and application thereof
  • Grain refining agent as well as preparation method and application thereof
  • Grain refining agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0109] The preparation method of the grain refiner comprises the following steps:

[0110] (1) Ingredients: Calculate and weigh raw materials according to the formula ratio;

[0111] (2) Smelting: heat and keep the raw materials prepared in step (1) together, or add them successively, and heat and keep them at different temperatures;

[0112] (3) Solidification: after cooling the master alloy obtained in step (2) to room temperature, remove the scale on the surface to obtain the grain refiner.

[0113] The heating temperature in step (2) ranges from 300°C to 3000°C, and the holding time is 0.1h to 24h.

[0114] Wherein, the preparation method steps for different raw materials correspond to the first to fifth preparation methods in the specification.

Embodiment 1

[0117] An Al-V-B refiner for aluminum-silicon alloy, prepared from 99.99% industrial pure aluminum, 99.9% industrial pure vanadium and 99.9% industrial pure boron, wherein the weight percent of pure vanadium is 2 %, the weight percentage of pure boron is 2%, and the balance is industrial pure aluminum. First, calculate and weigh the raw materials according to the above-mentioned weight percentages of aluminum, vanadium and boron. Next, the prepared aluminum, vanadium and boron are evenly mixed, and then the evenly mixed raw materials are wrapped in aluminum foil. Then the mixed and packaged raw materials are placed in the crucible of the arc melting furnace, and melted under vacuum conditions at a melting temperature of 1800°C. The sample was repeatedly smelted 3 times, and the smelting time was 5 minutes each time. After the melted Al-2%V-2%B alloy is cooled, it is taken out and put into a corundum crucible, and the corundum crucible is placed in a resistance furnace for he...

Embodiment 2

[0119] (1) Ingredients

[0120] The raw materials are industrial pure aluminum, industrial pure vanadium and industrial pure boron, and the raw materials are calculated and weighed according to the mass percentages of aluminum, vanadium and boron, wherein aluminum is 20%, vanadium is 40%, and boron is 40%;

[0121] (2) Melting

[0122] The aluminum, vanadium and boron prepared in step (1) are uniformly mixed, and then the uniformly mixed raw materials are wrapped in aluminum foil. Then put the packaged raw materials in the crucible of the electric arc melting furnace, and melt them under vacuum conditions at a melting temperature of 1800°C. The sample was repeatedly smelted 3 times, and the smelting time was 5 minutes each time. Then cool down with the furnace.

[0123] (3) Solidification

[0124] After the master alloy obtained by smelting in step (2) is cooled to room temperature, the oxide skin on the surface is removed to obtain the refiner.

[0125] In the above prep...

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Abstract

The invention discloses a grain refining agent. The molecular formula of the grain refining agent is AlxVyBzR100-x-y-z wherein R is an element harmless to refined alloy; and the percentage contents ofthe elements follow the standards that x ranges from 20 to 99.8wt.%, y ranges from 0.1 to 40wt.%, and z ranges from 0. 1 to 40wt.%. The invention further discloses a preparation method and a specificapplication of the grain refining agent. The grain refining agent prepared by adopting the preparation method has remarkable refining effect on aluminum-silicon series alloy and magnesium-aluminum series alloy, has good anti-degradation capability and has quite important theoretical significance and practical application value; the preparation method of the grain refining agent is simple in process and capable of obtaining raw materials easily; and the prepared aluminum-silicon series alloy refining agent has a good refining effect.

Description

technical field [0001] The invention belongs to the refining agent technology, in particular to a grain refining agent and its preparation method and application. Background technique [0002] Grain refinement is currently the only strengthening method that can guarantee an increase in strength without reducing plastic properties. Since the preparation of almost all metals undergoes a solidification process, and as a front-end process of metal processing, the solidification process plays a very important role in the structure and properties of metals. After research, it is found that solidification fine grain can not only improve the mechanical properties, but also reduce solidification defects. Therefore, it is of great practical significance to achieve grain refinement during the solidification of metals. Adding a refiner to molten metal has been extensively researched and paid attention to because of its simple operation and remarkable refinement effect, especially in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C1/03C22C1/06C22C21/00C22C30/00
CPCC22C1/02C22C1/026C22C1/03C22C1/06C22C21/00C22C21/02C22C30/00
Inventor 张云虎叶春洋申延平常旺宋长江郑红星翟启杰
Owner SHANGHAI UNIV
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