Unlock instant, AI-driven research and patent intelligence for your innovation.

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

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

Inactive Publication Date: 2015-04-15
NANCHANG UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Rare earth element praseodymium alloyed aluminum-silicon alloy and preparation method thereof

Examples

Experimental program
Comparison scheme
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-Pr master alloy at 780°C and keep it warm for 5 minutes, wherein the rare earth element Pr accounts for 0.05% 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 with a cooling rate of 40°C / min forming.

Embodiment 2

[0016] Add the Al-Si alloy with silicon content of 9.8% (weight percentage) into the graphite crucible and heat until it is completely melted, add the rare earth element Pr metal at 790°C and keep it warm for 6 minutes, wherein the rare earth element Pr accounts for 0.06% 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 treatment time is 30 seconds, and the intermittent time is 20 seconds; finally, the alloy melt is lowered to 720°C and kept for 61 minutes, and then cast in a metal mold with a cooling rate of 50°C / min forming.

Embodiment 3

[0018] Add the Al-Si alloy containing 10.2% (weight percentage) of silicon into the graphite crucible and heat it until it is completely melted, add the rare earth element Pr metal at 780 ° C and keep it warm for 8 minutes, wherein the rare earth element Pr accounts for 0.12% 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 with a cooling rate of 50°C / min forming.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
tensile strengthaaaaaaaaaa
elongationaaaaaaaaaa
elongationaaaaaaaaaa
Login to View More

Abstract

Provided are a rare earth element praseodymium (Pr) alloyed aluminum-silicon (Al-Si) alloy and a preparation method thereof. The alloy comprises the components by the weight percentage: 9.0-12.0% of Si, 0.05-0.4% of Pr, and the balance being Al. The preparation method comprises the steps: after heating an Al-Si alloy placed in a graphite crucible to melt, adding Pr or an Al-Pr intermediate alloy at the temperature of 770-790 DEG C according to the above weight percentage, and carrying out heat preservation for 5-8 minutes; under conditions of the ultrasonic intensity of 10 W / cm<2>-38 W / cm<2>, the total ultrasonic treatment time of 3-8 minutes, each ultrasonic treatment time of 20-30 seconds, and the intermittent time of 20-30 seconds, applying intermittent ultrasonic treatment to the alloy melt, then cooling the alloy melt down to 720-740 DEG C, carrying out heat preservation for 31-180 minutes, and then carrying out coagulation forming at the cooling rate of 40-65 DEG C / min. 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 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 has excellent casting performance, no thermal cracking and looseness, and high air tightness. Its density is small, corrosion resistance is good, and it 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 atomic magnetic moment, and strong spin coupling characteristics, and their influence on aluminum alloys is also quite unique. The modification of rare earth elements has the characteristics of long-t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C1/03B22D27/20
Inventor 胡志闫洪阮先明
Owner NANCHANG UNIV