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Hypereutectic aluminium-silicon alloy alterant and application

A technology of aluminum-silicon alloy and modification agent, which is applied in the field of hypereutectic aluminum-silicon alloy modification agent, which can solve the problems of coarse primary silicon and achieve the effect of dense structure, uniform distribution and simple modification process

Active Publication Date: 2017-09-22
福建祥鑫股份有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] In order to solve the problem of coarse primary silicon in hypereutectic aluminum-silicon alloys, the present invention provides a novel modifier for hypereutectic aluminum-silicon alloys and its application method

Method used

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  • Hypereutectic aluminium-silicon alloy alterant and application
  • Hypereutectic aluminium-silicon alloy alterant and application
  • Hypereutectic aluminium-silicon alloy alterant and application

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Embodiment Construction

[0034] The technical solutions of the present invention are further specifically described below through examples. It should be noted that the following examples and comparative examples are only used to explain the present invention, and should not be regarded as limiting the scope of the claims of the present invention.

[0035] Examples and comparative examples

[0036] In the present invention, the prepared hypereutectic aluminum-silicon alloy raw materials are sequentially melted in a resistance furnace, then the melt is overheated to 750-850° C., and then the Cu-2Be master alloy modifier (containing 2wt% of Be) is pressed Put it into the overheated hypereutectic aluminum-silicon alloy melt, stir it well, and keep it warm for 30-60 minutes; then add conventional refining agents for degassing and refining, and keep it warm for 10-15 minutes; finally, pour the hypereutectic aluminum-silicon alloy melt into castings or For ingot casting, the pouring temperature is 740-800°C...

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Abstract

The invention belongs to the technical field of nonferrous metal materials and particularly relates to a hypereutectic aluminium-silicon alloy alterant and application. The hypereutectic aluminium-silicon alloy alterant contains Be. A better application technology of the hypereutectic aluminium-silicon alloy alterant is as follows: overheating hypereutectic aluminium-silicon alloy melt to 750-850 DEG C, pressing a Be alterant into the overheated alloy melt, fully stirring, preserving heat for 30-60 minutes, refining for degassing, standing and preserving heat for 10-15 minutes, and pouring into casting or cast ingot, wherein the pouring temperature is 740-800 DEG C and the cooling rate is 50-100 DEG C / s. The hypereutectic aluminium-silicon alloy alterant enables the average size of primary silicon in hypereutectic aluminium-silicon alloy containing 15-25% of silicon to be refined to below 30 microns, is uniform in distribution, remarkably improves the comprehensive mechanical property, and effectively promotes application of hypereutectic aluminium-silicon alloy.

Description

technical field [0001] The invention belongs to the technical field of non-ferrous metal materials, and in particular relates to a hypereutectic aluminum-silicon alloy modifier and its application. Background technique [0002] Due to its good wear resistance, corrosion resistance, low expansion coefficient, excellent mechanical properties and castability, hypereutectic aluminum-silicon alloy is an ideal material for manufacturing wear-resistant and heat-resistant parts such as motorcycles and automobile engine pistons. However, the hypereutectic aluminum-silicon alloy structure without modification often contains coarse and flaky primary silicon, which will severely split the matrix and significantly reduce the strength and toughness of the alloy, especially the plasticity of the alloy is very poor, and the elongation is generally 1%. Below, it is difficult to meet the requirements of production and use. Therefore, effective modifiers and treatment processes must be adopte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/04C22C1/03
CPCC22C1/026C22C1/03C22C21/04
Inventor 林高用李坤谭鑫陈昭
Owner 福建祥鑫股份有限公司
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