Vacuum Degassing of Aluminium Alloys

Hydrogen is the only gas that is appreciably soluble in aluminum and its alloy. Its solubility is small but its effects on the mechanical properties and finishing characteristics of aluminum alloys are significant. In this paper, a patented degassing process, which is based on the vacuum metallurgy principle, is proposed. The diffusion equation was used for explaining hydrogen transfer in the liquid aluminum under the function of a porous sucking head. RPT experiment was carried out to evaluate effectiveness of the process. The experiment indicates that the hydrogen content can be dramatically reduced to 0.05ml/100gAl owing to the use of this new process.

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“…The operation was quite simple. A porous sucking head (1) was immersed into the liquid aluminum (2). Switch the valve (5) on and sucking begins.…”

Section: Theoretical and Principlementioning

confidence: 99%

“…Instead, refining of aluminum melt was substituted by inert gases such as nitrogen and argon [1]. Degassing under vacuum is also an effective technology [2,3]. In this process, the crucible is tightly covered to create a space over the molten aluminum.…”

Section: Introductionmentioning

confidence: 99%

New Process of Elimination of Hydrogen from Melt Aluminum

Zeng

Zheng

2008

AMR

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“…Some physical processes have also found their uses in degassing of aluminum melt such as supersonic vibration and filtration [3,4]. Among them, degassing under vacuum is also an effective technique [5]. In this process, the crucible is placed in a chamber with an enclosed space over the molten aluminum.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Inner Vacuum Sucking method for degassing of molten aluminum

Jian-min

You-bing

2012

Materials Science and Engineering: B

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“…These include the use of holding furnaces, [1] rotary degassing systems using nitrogen, [2] argon, [2] chemical additives, emitting inert gases, [3] filtration, [4] etc. Typically only larger type inclusions can be removed by holding the melt in furnace.…”

Section: Introductionmentioning

confidence: 99%

Continuous Removal of Nonmetallic Inclusions from Aluminum Melts by Means of Stationary Electromagnetic Field and DC Current

Zhou

2007

Metall Mater Trans A

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In order to continuously remove small nonmetallic inclusions from aluminum melts, stationary electromagnetic field and direct current (DC) were simultaneously applied to the aluminum melt. The principle of removal of nonmetallic inclusions from aluminum melts is that electromagnetic force (EMF) scarcely acts on the nonmetallic inclusions due to its low electric conductivity as compared to the aluminum melt. As a result, a repulsive force exerts on the nonmetallic inclusions to move them in the direction opposite to that of the EMF. Al 2 O 3 particles (>15 lm) were chosen to simulate nonmetallic inclusions in aluminum melt. Experimental results show that all Al 2 O 3 particles larger than 15 lm were removed after treatment with the electromagnetic separation chamber. It was found that the tensile strength of the Al-Cu alloy processed by degassing and electromagnetic separation was 7.72 pct higher than that processed by degassing only and 2.70 pct higher than that processed by degassing with subsequent filtration.

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Vacuum Degassing of Aluminium Alloys

Cited by 7 publications

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New Process of Elimination of Hydrogen from Melt Aluminum

New Process of Elimination of Hydrogen from Melt Aluminum

Investigation of Inner Vacuum Sucking method for degassing of molten aluminum

Continuous Removal of Nonmetallic Inclusions from Aluminum Melts by Means of Stationary Electromagnetic Field and DC Current

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