Temperature programmed desorption studies of outgassing of aluminium powder

Abstract : The mechanical properties of powder metallurgy (P.M.) aluminium alloys may be influenced considerably by the hydrogen content. To obtain high-quality alloys, it is necessary to optimize the degassing of the powder before sintering. Such a process involves an understanding of the mechanism of the desorption of H2 from the surface of the powder. By means of the temperature programmed desorption technique, hydrogen evolution has been studied on an X7xxx (Al, Zn, Mg, Cu) P.M. alloy. The results show a large influence of the atomization procedure (with air or with helium). Hydrogen formation results from water decomposition at the contact of the alloying metals, but two different mechanisms may occur. ** Water is chemisorbed on the sample and the decomposition process is conditioned by the break-up of the oxide layer, followed by the evaporation of zinc and magnesium. ** As a function of the temperature, water is liberated in the network of the oxide by a transformation of the aluminium hydroxides and may react with metal at the metal-oxide interface.
Type de document :
Article dans une revue
Journal of Thermal Analysis, 1986, 31, pp.1109-1119
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Soumis le : mercredi 25 novembre 2009 - 12:51:02
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  • HAL Id : emse-00435922, version 1


René Lalauze, Isabelle Guillemin, Christophe Pijolat. Temperature programmed desorption studies of outgassing of aluminium powder. Journal of Thermal Analysis, 1986, 31, pp.1109-1119. 〈emse-00435922〉



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