Abstract: A device for depositing a thick metal nitride on a sample by supercritical fluids includes a first enclosure forming a first closed volume; a second enclosure placed in the first enclosure and delimited by internal walls transparent to electromagnetic radiation forming a second closed volume intended to include fluid under supercritical conditions; a heat transfer dielectric fluid circulating in the first volume around the second enclosure; a sample holder present in the second volume; an induction heating device surrounding the second enclosure; inlets for introducing a fluid and at least one precursor material into the second enclosure, and an outlet to purge the second volume.

Abstract: A process for coating a substrate with tantalum nitride by the high-power impulse magnetron sputtering technique, wherein a tantalum target is used and wherein the coating of the substrate is carried out in an atmosphere containing nitrogen, the bias of the target being controlled during the coating by imposing on it the superposition of a continuous bias at a potential between ?300 V and ?100 V and of a pulsed bias whose pulses have a potential between ?1200 V and ?400 V.

Abstract: A method for forming a layer of alumina on the surface of a metal alloy substrate including aluminium, includes depositing a first aluminium layer on a surface of the metallic substrate, depositing a second layer by vapour-phase deposition on the first layer, the second layer comprising aluminium, a halogen and oxygen, and heat treatment of the substrate coated with the first and second layers under oxidising atmosphere in order to form the layer of alumina at the surface of the metallic substrate.