High temperature behaviour of AlN based ceramics in water vapor.

Comportement dans la vapeur d'eau à haute température du nitrure d'aluminium fritté.

Said Yefsah (1, 2) , Michel Billy (3) , Jean Jarrige (3) , Jacques Mexmain , Françoise Nardou (3) , Pierre Raynaud (2)

1 UMMTO - Université Mouloud Mammeri [Tizi Ouzou]
2 UNILIM - Université de Limoges
3 SPCTS - Science des Procédés Céramiques et de Traitements de Surface

Fully dense (97%) aluminium nitride obtained by pressureless sintering with CaO additive (1wt%) has been studied in water vapour in the range 1300-1450°C. The oxidation resistance is similar to that in oxygen, though the hydrogen produced at the inner interface (AlN-oxide) during the reaction opens the microstructure of the scale products. As a consequence, kinetics are controlled by a linear mechanism with an activation energy of 55 Kcal/Mole probably in connection with the break of Al-N bonds (54 Kcal/Mole).

Domaines: Chimie; Matériaux

Said Yefsah, Michel Billy, Jean Jarrige, Jacques Mexmain, Françoise Nardou, et al.. Comportement dans la vapeur d'eau à haute température du nitrure d'aluminium fritté.. Annales de Chimie - Science des Matériaux, 1985, 10, pp.79. ⟨hal-01878369⟩