Elaboration, microstructure and oxidation behavior of metal-alumina and metal-chromia nanocomposite powders.

Christophe Laurent (1) , Christophe Blaszczyk (1) , Marc Brieu (1) , Abel Rousset (1)

1 LCMI - Laboratoire de Chimie des Matériaux Inorganiques

Metal-Al203 and metal-Cr203 nanocomposite powders have been prepared by selective reduction in hydrogen of oxide solid solutions. The metallic phase (either Cr or an (Fe, Cr) alloy) is present in the form of nanometric particles inside and/or at the surface of the oxide matrix grains. The microstructure of the different composites has been compared and their air oxidation behavior has been investigated. The metal particles located in the open porosity of the matrix are totally oxidized at temperatures lower than 600°C, whereas those intragranularly located are stable up to 800°C. The oxidation behavior is generally complex and explanations in relation to the powder microstructure are proposed.

Mots clés: Metal-alumina; Metal-chromia; Nanocomposite powders

Domaines: Matériaux; Matériaux

Christophe Laurent, Christophe Blaszczyk, Marc Brieu, Abel Rousset. Elaboration, microstructure and oxidation behavior of metal-alumina and metal-chromia nanocomposite powders.. Nanostructured Materials, 1995, 6 (1-4), pp.317-320. ⟨10.1016/0965-9773(95)00061-5⟩. ⟨hal-03485551⟩