Strontium-silicon alterative for hypereutectic AlSi alloy

A technology of aluminum-silicon alloy and modifier, which is applied in the field of strontium-silicon modifier, can solve the problems of splitting matrix continuity, restricting the application range of hypereutectic aluminum-silicon alloy, deteriorating the comprehensive mechanical properties and cutting performance of the alloy, and achieving The modification effect is stable, the environmental pollution is small, and the effect of improving the performance of the alloy

Inactive Publication Date: 2012-01-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a strontium-silicon modifier for hypereutectic aluminum-silicon alloys, which can seriously split the continuity of the Al matrix, deteriorate the comprehensive mechanical properties and cutting performance of the alloy, and restrict the hypereutectic aluminum The problem of the scope of application of silicon alloy

Method used

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  • Strontium-silicon alterative for hypereutectic AlSi alloy
  • Strontium-silicon alterative for hypereutectic AlSi alloy
  • Strontium-silicon alterative for hypereutectic AlSi alloy

Examples

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Embodiment 1

[0016] Example 1: (1) The mass percent composition of the modificator is silicon: 80%, strontium: 20%. Compact under a pressure of 1KN; (2) Put the briquette into the rapid heating furnace, and make the rapid heating furnace heat up from room temperature to 1500°C in 30 minutes, keep it warm for 60 minutes, and cool it with the furnace; (3) Put the silicon prepared in step 2 - Strontium alloy crushing, ball milling, the ball milling particle size is 200 mesh; (4) The ball milled Si-Sr modifier is heat treated at 1000°C, and the obtained modifier is Si and Si 2 Mixture of Sr.

Embodiment 2

[0017] Example 2: (1) The mass percent composition of the modificator is silicon: 57.2%, strontium: 42.8%. Compact under a pressure of 1KN; (2) Put the briquette into the rapid heating furnace, and make the rapid heating furnace heat up from room temperature to 1500°C in 30 minutes, keep it warm for 60 minutes, and cool it with the furnace; (3) Put the silicon prepared in step 2 - The strontium alloy is crushed and ball milled with a particle size of 200 mesh. (4) The ball-milled Si-Sr modifier is heat-treated at 1045°C, and the obtained modifiers are SiSr and Si 2 Mixture of Sr.

Embodiment 3

[0018] Example 3: (1) The mass percent composition of the modificator is silicon: 11.5%, strontium: 88.5%. Compact under a pressure of 1KN; (2) Put the briquette into the rapid heating furnace, and make the rapid heating furnace heat up from room temperature to 1500°C in 30 minutes, keep it warm for 60 minutes, and cool it with the furnace; (3) Put the silicon prepared in step 2 - Crushing and ball milling of strontium alloy, the particle size of the ball mill is 200 mesh; (4) Heat treatment of the ball-milled Si-Sr modifier at 700°C, and the obtained modifiers are Sr and SiSr 2 mixture.

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Abstract

The invention provides a strontium-silicon alterative for hypereutectic AlSi alloy, and belongs to a flux for altering melt in the AlSi alloy casting process. The strontium-silicon alterative for hypereutectic AlSi alloy consists of the following components in percentage by mass: 20 to 88.5 percent of strontium, and 11.5 to 80 percent of silicon. The preparation method comprises the following steps: (1) weighing silicon powder and strontium powder according to the mass percentage that strontium accounts for 20 to 88.5 percent and silicon accounts for 11.5 to 80 percent, and uniformly mixing the silicon powder and the strontium powder in vacuum; (2) compacting the mixed powder into a briquette at a pressure of 1kN; (3) melting the compacted Si and Sr briquette into Si-Sr alloy in a rapid heating furnace, heating the rapid heating furnace from room temperature to 1500 DEG C in 30 minutes, preserving the temperature for 60 minutes, and cooling along with the furnace; (4) crushing the silicon-strontium alloy which is prepared in the step 3, and performing ball milling; and (5) thermally treating the ball-milled Si-Sr alterative at the temperature of between 700 and 1045 DEG C to acquire a corresponding eutectic structure. The strontium-silicon alterative has the advantages that: primary silicon phase and eutectic silicon phase in the hypereutectic AlSi alloy are refined, so that the using performance of the alloy is improved; the alternation effect is stable and long-acting; and the preparation process is simple, and has low environmental pollution.

Description

technical field [0001] The invention relates to a flux for modifying melt in the casting process of aluminum-silicon alloy, in particular to a strontium-silicon modification agent for hypereutectic aluminum-silicon alloy. technical background [0002] Hypereutectic Al-Si alloy has the advantages of low density, good thermal conductivity, small thermal expansion coefficient, wear resistance, corrosion resistance, good dimensional stability, etc., and has a small tendency to hot cracking. However, in the unmodified hypereutectic aluminum-silicon alloy, there are coarse and massive primary silicon and thick and long needle-shaped eutectic silicon structures, which seriously split the continuity of the Al matrix and deteriorate the comprehensive mechanical properties and cutting process of the alloy. performance, which restricts the scope of application of hypereutectic Al-Si alloys. Contents of the invention [0003] The purpose of the present invention is to provide a stron...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04B22D27/20B22D21/04
Inventor 张绪平张文杨永建祁晓乾
Owner CHINA UNIV OF MINING & TECH
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