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A kind of aluminum-silicon-samarium cast aluminum alloy and its preparation method

A technology for casting aluminum alloys and alloys, which is applied in the field of casting aluminum alloys, can solve the problems of non-repeatable implementation effects, no rotating magnetic field process, etc., and achieve the effects of improved shape, convenient operation, and no three-waste pollution

Active Publication Date: 2016-01-20
优标易站(苏州)电子商务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The microstructure of the alloy is improved on the basis of the ternary compound modification. Although the application of a rotating magnetic field can further enhance the modification effect and effectively refine the size of α-Al dendrites, the specific process of the rotating magnetic field is not given in the paper. The effect is not reproducible

Method used

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  • A kind of aluminum-silicon-samarium cast aluminum alloy and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0014] First, the Al-Si alloy containing 9.0% (weight percent) silicon in the graphite crucible is heated to melt in an electromagnetic stirring furnace, and the Al-Sm master alloy is added at 820°C and kept for 25 minutes, wherein the rare earth element Sm accounts for the total weight of the alloy. 0.03% of 0.03%, and then apply electromagnetic stirring, the electromagnetic stirring frequency is 25HZ, the current intensity is 30A, and the electromagnetic stirring time is 10 minutes. Finally, after degassing, refining and slag removal, the obtained homogeneous melt is cast into a metal mold to obtain an alloy ingot, and the casting temperature is 685°C.

Embodiment 2

[0016] First, the Al-Si alloy containing 9.0% (weight percent) silicon in the graphite crucible is heated to melt in an electromagnetic stirring furnace, and the rare earth element Sm is added at 810°C and kept for 20 minutes, wherein the rare earth element Sm accounts for 0.08% of the total weight of the alloy. %, and then apply electromagnetic stirring, the electromagnetic stirring frequency is 22HZ, the current intensity is 20A, and the electromagnetic stirring time is 10 minutes. Finally, after degassing, refining and slag removal, the obtained homogeneous melt is cast into a metal mold to obtain an alloy ingot, and the casting temperature is 680°C.

Embodiment 3

[0018] First, heat the Al-Si alloy containing 9.4% (weight percent) of silicon in the graphite crucible to melt in an electromagnetic stirring furnace, add the Al-Sm master alloy at 820 ° C and keep it warm for 25 minutes, wherein the rare earth element Sm accounts for the total weight of the alloy 0.11% of 0.11%, and then apply electromagnetic stirring, the electromagnetic stirring frequency is 25HZ, the current intensity is 30A, and the electromagnetic stirring time is 15 minutes. Finally, after degassing, refining and slag removal, the obtained homogeneous melt is cast into a metal mold to obtain an alloy ingot, and the casting temperature is 685°C.

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Abstract

The invention provides an aluminum-silicon-samarium casting aluminum alloy and a preparation method thereof. The alloy comprises the components by the weight percentage: 9.0-9.8% of silicon, 0.03-0.2% of samarium, and the balance being aluminum. The preparation method comprises the steps: firstly, heating an Al-Si alloy placed in a graphite crucible in an electromagnetic stirring furnace to melt, after adding the rare earth element Sm at the temperature of 810-840 DEG C, carrying out heat preservation for 20-30 minutes, then carrying out electromagnetic stirring for 10-15 minutes with the electromagnetic stirring frequency of 22-28 HZ and the current intensity of 20-40 A, and finally degassing, refining and deslagging the obtained uniform melt, then cooling the alloy melt down to 680-690 DEG C, and carrying out casting moulding in a metal mould. The addition of the rare earth Sm into the Al-Si aluminum alloy does not increase the cost of production, but the addition of the rare earth Sm can obviously improve the morphology of a silicon phase in the alloy and can refine alpha phase organization, so that lumpy primary silicon disappears, the shape of eutectic silicon is changed into a punctiform shape or a short-rod shape from a coarse needle shape; and the preparation method has simple process, safety and reliability, easy operation, and no three-waste pollution.

Description

technical field [0001] The invention belongs to the technical field of casting aluminum alloy preparation. Background technique [0002] Al-Si alloy is the most important series of aluminum-based alloys. It has a simple eutectic phase diagram with a eutectic temperature of 577°C and a eutectic composition of 12.6wt.%Si. Al-Si binary alloy has excellent casting performance, no hot cracking and loose tendency, and high air tightness. It has low density and good corrosion resistance. It can be used in environments subject to atmospheric and seawater corrosion, and can withstand the corrosive effects of concentrated nitric acid and hydrogen peroxide in industrial atmosphere environments. [0003] In the as-cast condition, in the Al-Si alloy without modification and refinement treatment, the eutectic silicon is in the shape of thick needle flakes, and the primary silicon is in the shape of thick polygonal blocks and plates. These coarse and brittle Si phases severely split the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03
Inventor 胡志闫洪邱鸿旭华群
Owner 优标易站(苏州)电子商务有限公司