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Structural studies of Al-based powders prepared by chemical methods

Published online by Cambridge University Press:  31 January 2011

M. Lenarda ,
R. Ganzerla ,
L. Storaro ,
R. Frattini  and
S. Enzo
M. Lenarda
Affiliation:
Dipartimento di Chimica, DD 2137, 30123 Venezia, Italy
R. Ganzerla
Affiliation:
Dipartimento di Chimica, DD 2137, 30123 Venezia, Italy
L. Storaro
Affiliation:
Istituto di Chimica, via del Cotonificio 108, 33100 Udine, Italy
R. Frattini
Affiliation:
Dipartimento di Chimica Fisica, DD 2137, 30123 Venezia, Italy
S. Enzo
Affiliation:
Dipartimento di Chimica Fisica, DD 2137, 30123 Venezia, Italy
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Abstract

Finely dispersed metal powders have been obtained after chemical reduction of Ni and Co acetylacetonate by lithium aluminum hydride in tetrahydrofuran at low temperature. The Al/Ni and Al/Co stoichiometry of the as-reduced powders was 1.1 and 1.2, respectively. The structure and thermal stability of the as-reduced powders were affected by the temperature of reduction. For the NiAl powders it was found that the thermal treatment initially induces a separation of highly unstable Ni(Al) and Al(Ni) solid solutions, which subsequently react to give a single NiAl phase of cubic structure not reported in the equilibrium phase diagram. Conversely, the reduction of cobalt acetylacetonate directly gives a cubic metastable phase, from which precipitates some hexagonal form of Co after treatment at 450 °C.

Type
Articles
Information
Journal of Materials Research , Volume 7 , Issue 9 , September 1992 , pp. 2418 - 2423
Copyright
Copyright © Materials Research Society 1992

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