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  • 1
    Electronic Resource
    Electronic Resource
    New Process of Elimination of Hydrogen from Melt Aluminum (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 51 (June 2008), p. 93-98 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Hydrogen is the only gas that is appreciably soluble in aluminum and its alloy. Its solubilityis small but its effects on the mechanical properties and finishing characteristics of aluminum alloysare significant. In this paper, a patented degassing process, which is based on the vacuum metallurgyprinciple, is proposed. The diffusion equation was used for explaining hydrogen transfer in the liquidaluminum under the function of a porous sucking head. RPT experiment was carried out to evaluateeffectiveness of the process. The experiment indicates that the hydrogen content can be dramaticallyreduced to 0.05ml/100gAl owing to the use of this new process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.51.93.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Investigation on Purification and Degassing of TiB〈sub〉2〈/sub〉/Al Composite Fabricated by LSM Method (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 3051-3054 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In the present paper, TiB2/Al composite with 5% volume fraction of TiB2 was fabricated byLSM method. The effects of purification and degassing methods on TiB2/Al composite wereexamined by means of X-ray diffraction (XRD) and image analysis. Hydrogen contents in the moltencomposites were detected and compared among flux, inert gas and vacuum purification processes.The experimental results indicate that under general cast condition a majority of the TiB2 particlesdistribute on grain boundary, and only a few particles disperse within grains. The flux and vacuumpurifications have no virtual impact on the distribution of TiB2 and the fraction of TiB2 remains thesame after purification. However, degassing with inert gas will be detrimental; the TiB2 particles willbe separated and removed from the matrix. The hydrogen contents for flux, inert gas and vacuumprocesses are 0.15ml/100g/Al, 0.12ml/100g/Al and 0.12ml/100g/Al respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.3051.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Investigations on Hydrogen Content Change in Melt Aluminum during Casting under Adjusted Pressure (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 3059-3062 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, a new low-pressure die-casting with degassing function, casting underadjusted pressure (CAP), is proposed. The working principle of CAP process is introduced in details.This paper focuses on the influences of moisture of compressed air on the hydrogen content within themelt aluminum during the cyclic vacuum-pressurizing programs for CAP process. The experimentalresults indicate that degassing under vacuum acts positive in refining aluminum melt. The relativemoisture of compressed air exerts a significant influence on the hydrogen content of aluminum melt.After the melt aluminum is exposed to the air with a relative moisture of 85% for 90 min, thehydrogen content of the melt aluminum can get to 0.4 ml/100g/Al; while under the circumstance ofCAP process, the hydrogen content is maintained between 0.05 and 0.15 ml/100g/Al depending onthe moisture capacity of the air, which virtually has no more influence on the casting qualities. Underthe condition of dry compressed air, the hydrogen content can be kept at a level as low as0.05ml/100g/Al, which facilitates to obtain high air-tightness castings
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.3059.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Investigation on Friction and Thermal Expansion Coefficients of Al-Sn Bearing Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 3063-3066 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The influences of Sn addition of 3%-30% on the friction and thermal expansion propertiesof Al-Sn bearing alloys were investigated in this paper. The experiments were carried out on aspecially designed friction testing machine and a dilatometer. It is shown by the experiments that thefriction coefficient and hardness of the alloys decrease with the increasing of Sn content. The frictioncoefficient decreases dramatically when Sn content is higher than 6%. On the other hand, the frictioncoefficient is also dependent on the load. The friction coefficient increases as the load rises. The linearCTE is also a function of temperature and Sn contents. CTE increases when the temperature rises buthas no obvious differences for the alloy system when the temperature is below 80°C. As thetemperature rises, the differences become large among the alloy system. The higher the Sn content,the lower the CTE
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.3063.pdf
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