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Method for preparing nano SiC and Yb reinforced A356.2 alloy

A nano-alloy technology, applied in the field of preparing nano-SiC, Yb-reinforced A356.2 alloy, can solve the problems of difficulty in preparing SiC-Al composite materials, non-wetting of silicon carbide and aluminum liquid, limited research on heavy rare earth elements, etc., to achieve The effect of increasing pouring quality, reducing gas content and improving mechanical properties

Active Publication Date: 2017-08-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also improvements to reduce the hydrogen embrittlement of A356.2, but most of the current research is limited to adding light rare earth elements alone, and the research on heavy rare earth elements is limited
[0005] As a structural material, SiC-Al composite materials are widely used in helicopter rotors, brake discs, etc. However, due to the non-wetting of silicon carbide and aluminum liquid, it is extremely difficult to prepare SiC-Al composite materials
Most people use the method of powder metallurgy to prepare, but the production process of this method is cumbersome, the sintering process is not easy to control, it is not easy to prepare large structural parts, and the production cycle is long

Method used

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  • Method for preparing nano SiC and Yb reinforced A356.2 alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for preparing nano-SiC-Yb reinforced A356.2 alloy, comprising the following steps:

[0056] 1) Pretreatment of silicon carbide:

[0057] (1) Weigh 5.25g of silicon carbide with an average particle size of 5nm-90nm, add 20ML of alcohol, and ultrasonically disperse for 30 minutes;

[0058] (2) Put the silicon carbide that has been ultrasonicated into a blast drying oven, and dry it at 70°C for 2 hours;

[0059] (3) After drying, put it into the grinding bowl and grind for 2 hours;

[0060] (4) SiC is put into a quartz crucible, heated to 300°C for 30 minutes, then heated to 1200°C for 5 hours, and stirred every 30 minutes for 40 seconds;

[0061] (5) Remove particles larger than 100nm from the pretreated SiC.

[0062] 2) Subsequent processing of SiC

[0063] (1) Place the magnetron sputtered glass slide in a beaker filled with acetone, and clean it in an ultrasonic cleaner for 20 minutes; take out the glass slide and clean it in absolute ethanol for 20 minute...

Embodiment 2

[0081] A method for preparing nano-SiC, Yb reinforced A356.2 alloy, comprising the following steps:

[0082] 1) Pretreatment of silicon carbide:

[0083] (1) Weigh 5.25g of silicon carbide with an average particle size of 5nm-90nm, add 20ML of alcohol, and ultrasonically disperse for 30 minutes;

[0084] (2) Put the silicon carbide that has been ultrasonicated into a blast drying oven, and dry it at 70°C for 2 hours;

[0085] (3) After drying, put it into the grinding bowl and grind for 2 hours;

[0086] (4) SiC is put into a quartz crucible, heated to 295°C for 30 minutes, then heated to 1195°C for 5 hours, and stirred every 30 minutes for 40 seconds;

[0087] (5) Remove particles larger than 100nm from the pretreated SiC.

[0088] 2) Subsequent processing of SiC

[0089] (1) Place the magnetron sputtered glass slide in a beaker filled with acetone, and clean it in an ultrasonic cleaner for 20 minutes; take out the glass slide and clean it in absolute ethanol for 20 minut...

Embodiment 3

[0106] A method for preparing nano-SiC, Yb reinforced A356.2 alloy, comprising the following steps:

[0107] 1) Pretreatment of silicon carbide:

[0108] (1) Weigh 5.25g of silicon carbide with an average particle size of 50nm, add 20ML of alcohol, and ultrasonically disperse for 30 minutes;

[0109] (2) Put the silicon carbide that has been ultrasonicated into a blast drying oven, and dry it at 70°C for 2 hours;

[0110] (3) After drying, put it into the grinding bowl and grind for 2 hours;

[0111] (4) SiC is put into a quartz crucible, heated to 305°C for 30 minutes, then heated to 1205°C for 5 hours, and stirred every 30 minutes for 40 seconds;

[0112] (5) Remove particles larger than 100nm from the pretreated SiC.

[0113] 2) Subsequent processing of SiC

[0114](1) Place the magnetron sputtered glass slide in a beaker filled with acetone, and clean it in an ultrasonic cleaner for 20 minutes; then take out the glass slide and clean it in absolute ethanol for 20 minut...

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PUM

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Abstract

The invention discloses a method for preparing nano SiC and Yb reinforced A356.2 alloy. The method comprises the following steps of using nano SiC as particle reinforcements, performing ultra-high-temperature oxidation treatment, then uniformly wrapping high-purity metal Ti on the surfaces of SiC particles after oxidation treatment by adopting nano magnetron sputtering equipment, and adopting high-purity heavy rare earth modification and continuous ultrasound to assist to smelt, so that the casting quality is further increased. According to the method, an independent research and development resistance furnace bracket is used as auxiliary equipment, so that the SiC particles can be poured in a suspension state. The preparation method has the advantages of simplicity, low cost, short production cycle, greenness and no toxicity and has good industrialization prospects, and castings have high performance.

Description

technical field [0001] The invention relates to the field of alloy smelting, in particular to a method for preparing nano SiC and Yb reinforced A356.2 alloy. Background technique [0002] A356.2 aluminum alloy is a typical Al-Si-Mg ternary alloy. Compared with A356.0 and A356.1, the content of Fe is further reduced, and metal Ti is added to refine the grain better. A356.2 aluminum alloy can cast thin-walled parts with complex shapes. Because of its excellent casting performance and high plasticity, it is widely used in automobile wheels. [0003] The matrix of the A356.2 alloy without modification agent contains coarse plate-shaped needle-point primary silicon. Experience tells us that the coarser the grains, the more uneven the distribution, and the worse the performance of the material. At present, the production industry is committed to improving the performance of the traditional A356.2 alloy. The main method is to improve the coarse particles, make their distribution ...

Claims

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Application Information

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IPC IPC(8): C22C1/10C22C21/02C22C32/00C22F1/043C22C1/06C22B9/02
CPCC22B9/026C22C1/06C22C1/101C22C1/1036C22C21/02C22C32/0063C22F1/043C22C1/1047
Inventor 张少辰冷金凤周庆波王志斌夏昌鹏王康
Owner UNIV OF JINAN
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