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Flux foaming preparation method for foam magnesium

A technology of melt foaming and foamed magnesium, which is applied in the field of material processing, can solve the problems that silicon carbide does not have anti-oxidation and flame retardancy, cannot greatly reduce the production cost of foamed magnesium, and is unfavorable for the industrial application of foamed magnesium materials. Protective effect, good flame retardant and anti-oxidation function, and the effect of reducing production cost

Inactive Publication Date: 2008-03-05
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the thickener silicon carbide used does not have anti-oxidation and flame-retardant effects; secondly, the price of silicon carbide and magnesium carbonate powder is relatively high, which cannot greatly reduce the production cost of foamed magnesium, and has great impact on the industrialization of foamed magnesium materials. unfavorable application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Get 1000 grams of pure magnesium, and at a temperature of 710 to 730° C., melt the pure magnesium in a resistance furnace completely, add 80 grams of thickener metal calcium powder (the particle size is 0.05 to 0.5 mm, and the mass percentage purity is greater than 99.6%) to Improve the viscosity of the magnesium melt; the melt is stirred, the stirring speed is 300~600 rpm, and the stirring time is 10 minutes; 36 grams of foaming agent calcium carbonate powder (particle size 0.01~0.1 mm, mass percentage purity greater than 99.2%), stirring for 1 minute at a speed of 400-800 rpm; after stirring, pour the melt into a foaming tank preheated to 620°C, and send the foaming tank into a constant temperature furnace at 620°C to stand for foaming , the foaming time is 1 minute. After the foaming is finished, take out the foaming tank to air-cool, take out the foam body, and after mechanical processing, the average pore diameter is 0.2mm and the density is 0.7g / cm 3 magnesium fo...

Embodiment 2

[0019] The difference from Example 1 is:

[0020] Get 930 grams of magnesium, 60 grams of aluminum, and 10 grams of zinc to form an AZ61 alloy (magnesium+6% aluminum+1% zinc, percentage by mass). At a temperature of 720 to 740°C, the alloy is completely melted in a resistance furnace, and 50 gram thickener metal calcium powder (particle size is 0.05~0.5 millimeter, and mass percent purity is greater than 99.6%), to improve alloy melt viscosity; Melt is stirred, stirring speed 300~600 rpm, stirring time 2 minutes; Add 80 grams of foaming agent calcium carbonate powder (particle size 0.01-0.1 mm, mass percentage purity greater than 99.2%) to the melt, and stir for 2 minutes at a speed of 600-1000 rpm; after stirring, pour the melt into the preheated To a foaming tank at 650°C, put the foaming tank into a constant temperature furnace at 650°C to stand for foaming, and the foaming time is 5 minutes. After the foaming is finished, take out the foaming tank and air-cool, take out t...

Embodiment 3

[0022] The difference from Example 1 is:

[0023] Get 960 grams of magnesium, 30 grams of aluminum, and 10 grams of zinc to form an AZ31 alloy (magnesium+3% aluminum+1% zinc, in mass percentage). gram thickener metal calcium powder (particle size is 0.05~0.5 millimeter, and mass percent purity is greater than 99.6%), to improve alloy melt viscosity; Melt is stirred, stirring speed 300~600 rev / min, stirring time 5 minutes; Add 150 grams of foaming agent calcium carbonate powder (particle size 0.01-0.1 mm, mass percentage purity greater than 99.2%) to the melt, and stir for 5 minutes at a speed of 600-1000 rpm; after stirring, pour the melt into the preheated The foaming tank, the foaming tank is sent to 700 ℃ constant temperature furnace to stand still for foaming, and the foaming time is 10 minutes. After the foaming is finished, take out the foaming tank to air cool, take out the foam body, and after mechanical processing, the average pore diameter is 0.7mm and the density i...

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PUM

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Abstract

The present invention relates to material processing technology, and is melt foaming process for preparing foamed magnesium. Through heating magnesium base material to melt, adding thickener and foaming agent, pouring the melt into a foaming tank, standing to foam inside one thermostatic oven, cooling after foaming, and machining to form foamed magnesium product. The added thickener is metal calcium powder accounting for 2-8 wt% of the melt, and the added foaming agent is calcium carbonate powder accounting for 2-15 wt% of the melt. The present invention has convenient operation, easy control and low cost, can produce foamed magnesium product of different pore sizes, and is suitable for industrial production.

Description

technical field [0001] The invention relates to a method in the technical field of material processing, in particular to a method for preparing foamed magnesium by melt foaming. Background technique [0002] Lightweight metal foams are gaining increasing attention in automotive, railway and aerospace applications because of the resulting weight savings, energy savings and comfort improvements. Among lightweight metal materials, magnesium has the particular advantage of having the lowest density and high vibration damping capacity. Compared with foamed aluminum materials, foamed magnesium not only has lighter weight, higher specific strength and specific stiffness, can absorb impact energy more effectively in the event of a collision, but also has better damping, electromagnetic shielding and noise reduction performance . Nevertheless, the metal foam material that is currently being studied and applied more is still aluminum foam, and there are not many research reports on ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/08
Inventor 林金保王渠东彭立明
Owner SHANGHAI JIAO TONG UNIV
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