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Grain refiner and its preparation method and application

一种晶粒细化剂、细化剂的技术，应用在晶粒细化剂及其制备领域，能够解决理想细化剂缺乏、制约铝硅系合金和镁铝系合金应用、细化衰退等问题

Active Publication Date: 2020-01-07
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 refiner and its preparation method and application
  • Grain refiner and its preparation method and application
  • Grain refiner and its preparation method and application

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 an anti-degradation aluminum-silicon alloy refiner, as well as a preparation method and application of the aluminum-silicon alloy refiner. The refiner is an intermediate alloyprepared from three elements in percentage by mass: 20 to 99.8 percent of aluminum, 0.1 to 40 percent of vanadium and 0.1 to 40 percent of boron. The preparation method comprises the step of smeltingand solidifying two or three components from the aluminum, the vanadium, the boron, an aluminum-vanadium alloy, boron salt and vanadium salt, and obtaining the anti-degradation aluminum-silicon alloyrefiner. The aluminum-silicon alloy refiner prepared through the invention cannot be degraded within three hours, so that the degradation time is remarkably postponed; the aluminum-silicon alloy refiner can be applied industrially, has important theoretical significances and practical application values, and is particularly applicable to an aluminum-silicon alloy with the silicon content being larger than 4 percent by weight of Si. According to the preparation method of the aluminum-silicon alloy refiner, the process is simple, and the raw materials are easy to get. The aluminum-silicon alloyrefiner prepared through the invention has a favorable 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 Patents(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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