Theoretical analysis and experimental study of spray degassing method

Wu, Rong-Tsun; Shu, Da; Sun, Baode; Wang, Jun; Li, Fēi; Chen, Haiyan; Lü, Yanling

doi:10.1016/j.msea.2005.05.055

Cited by 21 publications

(18 citation statements)

References 2 publications

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“…Several approaches have been developed for degassing in the last several decades; for example, re-melting degassing [7], vacuum degassing [8,9], ultrasonic degassing [10,11], and spray degassing [12,13], as well as rotary impeller degassing with nitrogen, argon, or a mixture of the inert gases and chlorine as a purge gas [14][15][16]. Nevertheless, the research on technology and equipment of high-efficiency degassing depends on reliable physical property data and parameters of degassing mechanisms, which are still incompletely understood.…”

Section: Introductionmentioning

confidence: 99%

Study of Adsorption of Hydrogen on Al, Cu, Mg, Ti Surfaces in Al Alloy Melt via First Principles Calculation

Liu

Huang

Xiao

et al. 2017

Metals

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Adsorption of hydrogen on Al(111), Cu(111), Mg(0001), and Ti(0001) surfaces have been investigated by means of first principles calculation. The calculation of surface energy indicates that Mg(0001) is the most stable surface, while Ti(0001) is the most unstable surface among all the four calculated surfaces. The obtained adsorption energy shows that the interaction between Al and H atoms should be energetically unfavorable, and the adsorption of hydrogen on Mg(0001) surface was found to be energetically preferred. Besides, the stability of hydrogen adsorption on studied surfaces increased in the order of Al (111), Ti(0001), Cu(111), Mg(0001). Calculation results also reveal that hydrogen adsorption on fcc and hcp sites are energetically stable compared with top and bridge sites for Ti(0001), Cu(111), and Mg(0001), while hydrogen adsorbing at the top site of Al (111)

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Section: Introductionmentioning

confidence: 99%

Study of Adsorption of Hydrogen on Al, Cu, Mg, Ti Surfaces in Al Alloy Melt via First Principles Calculation

Liu

Huang

Xiao

et al. 2017

Metals

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“…There are several degassing methods currently in use or under study, including injection of purge gas (inert or reactive), 1 using hexachloroethane (C 2 Cl 6 ) tablet, 1 flux addition, 2 vacuum degassing, 8,9 ultrasonic degassing, [10][11][12][13] spray degassing 14,15 and rotary degassing. [16][17][18] Among these technologies, the rotary degassing [16][17][18] is an environment friendly degassing method and has a relatively high degassing efficiency while others usually cause environmental problems or are in a low degassing efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…However, it is difficult to reduce the bubble size to ,10 mm in diameter with the conventional rotary degassing process. 15 Although increasing the rotary speed can achieve smaller bubble size in the melt, 16,17 however, at a higher speed, it causes turbulence and vortex near the surface which accelerates hydrogen absorption from water vapour and increases entrained oxide films or bifilms in the melt and consequently decreases the melt quality. 21 The speed, therefore, cannot go too high.…”

Section: Introductionmentioning

confidence: 99%

Degassing LM25 aluminium alloy by novel degassing technology with intensive melt shearing

Zuo¹,

Jiang²,

Zhang³

et al. 2013

International Journal of Cast Metals Research

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Hydrogen is the only gas that is appreciably soluble in aluminium and its alloys and is the main cause of the gas porosity in aluminium alloy castings. A novel degassing technology with intensive melt shearing and Ar injection has been developed and its degassing effect on aluminium alloy has been studied. The experimental results showed that the new degassing technology can significantly degas LM25 aluminium alloy within a quite short period of time. By applying intensive melt shearing and Ar injection of 60 s, the density index D i was reduced from 10?70 to 0?98%, which means that the hydrogen concentration in the liquid alloy was significantly reduced. The effect of degassing time and isothermal holding time after degassing on the hydrogen concentration level in LM25 alloy melt was also studied and the mechanism of high degassing efficiency with this technology was discussed.

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“…Hydrogen dissolved in the melt will become oversaturated and gas pores will be formed during solidification. Therefore, the hydrogen content of the melt should be lowered to a relatively small level before aluminum melt is used to form aluminum products [1,2].…”

Section: Introductionmentioning

confidence: 99%

Study of hydrogen absorption of aluminum melt

Sun

Shu

et al. 2008

International Journal of Materials Research

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Study of hydrogen absorption of aluminum meltHydrogen absorption of aluminum melt during melt treatment is one of the important factors that affect the hydrogen content of aluminum melt. In this paper, the effects of several factors (melt temperature, atmosphere humidity, and rotary speed in the rotary impellor degassing process) on hydrogen absorption are investigated quantitatively. It is found that, the higher the melt temperature, the higher the atmospheric humidity, and the higher the rotary speed in the rotary impellor degassing process, the more serious the hydrogen absorption of melt will become.

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Theoretical analysis and experimental study of spray degassing method

Cited by 21 publications

References 2 publications

Study of Adsorption of Hydrogen on Al, Cu, Mg, Ti Surfaces in Al Alloy Melt via First Principles Calculation

Study of Adsorption of Hydrogen on Al, Cu, Mg, Ti Surfaces in Al Alloy Melt via First Principles Calculation

Degassing LM25 aluminium alloy by novel degassing technology with intensive melt shearing

Study of hydrogen absorption of aluminum melt

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