Rare earth element lanthanum alloyed aluminum-silicon alloy and preparation method thereof

A technology for alloying aluminum and rare earth elements, applied in the field of aluminum-silicon alloys and preparation, can solve the problems of poor heat resistance and machinability, low mechanical properties, etc., and achieve the effects of dispersed distribution, no three waste pollution, and convenient operation

Active Publication Date: 2013-12-25
优标易站(苏州)电子商务有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the alloy has low mechanical properties, poor heat resistance and machinability

Method used

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  • Rare earth element lanthanum alloyed aluminum-silicon alloy and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0014] Add the Al-Si alloy containing 9.0% (weight percentage) of silicon into the graphite crucible and heat until it is completely melted, add the Al-La master alloy at 780 ° C and keep it warm for 5 minutes, wherein the rare earth element La accounts for 0.08% of the total weight of the alloy; Then extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 10w / cm 2 , the total ultrasonic treatment time is 3 minutes, each ultrasonic time is 25 seconds, and the intermittent time is 25 seconds; finally, the alloy melt is lowered to 720 ° C and kept for 31 minutes, and then cast in a metal mold.

Embodiment 2

[0016] Add the Al-Si alloy containing 9.8% (weight percent) of silicon into the graphite crucible and heat it until it is completely melted, add the rare earth element La metal at 790 ° C and keep it warm for 6 minutes, wherein the rare earth element La accounts for 0.09% of the total weight of the alloy; then Extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 20w / cm 2 , the total ultrasonic treatment time is 4 minutes, each ultrasonic time is 30 seconds, and the intermittent time is 20 seconds; finally, the alloy melt is lowered to 720 ° C for 61 minutes, and then cast in a metal mold.

Embodiment 3

[0018] Add the Al-Si alloy with silicon content of 12.0% (weight percentage) into the graphite crucible and heat until it is completely melted, add the rare earth element La metal at 780°C and keep it warm for 8 minutes, wherein the rare earth element La accounts for 0.14% of the total weight of the alloy; then Extend the ultrasonic horn into the above alloy melt for intermittent ultrasonic treatment with an ultrasonic intensity of 25w / cm 2 , the total ultrasonic treatment time is 5 minutes, each ultrasonic time is 20 seconds, and the intermittent time is 20 seconds; finally, the alloy melt is lowered to 720 ° C and kept for 181 minutes, and then cast in a metal mold.

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Abstract

A rare earth element lanthanum alloyed aluminum-silicon alloy and a preparation method thereof are disclosed. The alloy comprises the components by the weight percentage: 9.0-13.5% of silicon, 0.08-0.45% of lanthanum, and the balance being aluminum. The preparation method comprises the steps: heating an aluminum-silicon alloy placed in a graphite crucible to melt, then adding lanthanum or an aluminum-lanthanum intermediate alloy at the temperature of 770-790 DEG C according to the weight percentage, and carrying out heat preservation for 5-8 minutes; then carrying out intermittent ultrasonic treatment under conditions of the ultrasonic intensity of 10 W / cm<2>-38 W / cm<2>, each ultrasonic treatment time of 20-30 seconds, the intermittent time of 20-30 seconds, and the total ultrasonic treatment time of 3-8 minutes; and when cooling the alloy melt down to 720-740 DEG C, carrying out heat preservation for 31-180 minutes, and then carrying out casting forming. The method can obviously promote refinement and nodularization of an alpha-Al phase; the method allows needle shaped eutectic silicon to be changed into punctiform-shaped eutectic silicon or short rod-shaped eutectic silicon, allows the distribution of the eutectic silicon to be more dispersed and more uniform, so that the method allows the microstructure and mechanical properties of the aluminum alloy to be improved significantly; and the method has simple process and convenient operation, is safe and reliable, and has no three-waste pollution.

Description

technical field [0001] The invention belongs to the technical field of aluminum-silicon alloy and its preparation. Background technique [0002] Aluminum-silicon (Al-Si) alloy is the most important series of aluminum-based alloys, which has a simple eutectic phase diagram with a eutectic temperature of 577°C and a eutectic composition of 12.6 wt.% Si. Aluminum-silicon alloy has excellent casting performance, no thermal cracking and looseness, and high air tightness. It has low density and good corrosion resistance, and can withstand the atmosphere. Used in seawater corrosive environments, can withstand concentrated nitric acid in industrial atmospheres. The corrosion effect of oxygen peroxide, etc.; the welding performance is also good. However, the alloy has low mechanical properties, poor heat resistance and machinability. [0003] Rare earth elements have unique electronic layer structure and physical and chemical properties, unique 4f electronic structure, large atom...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03B22D27/20
Inventor 胡志闫洪阮先明熊俊杰
Owner 优标易站(苏州)电子商务有限公司
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