A plasma spraying method

C - Chemistry – Metallurgy – 23 – C

Patent

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C23C 4/12 (2006.01)

Patent

CA 2482085

The plasma spraying method is a coating method in which a material to be coated is sprayed onto a surface of a metallic substrate (2) in the form of a powder beam. The coating material is injected at a low process pressure, which is lower than 10,000 Pa, into a plasma defocusing the powder beam and is there partly or fully melted. In this connection, a plasma with sufficiently high specific enthalpy is produced so that a substantial portion, amounting to at least 5% by weight, of the coating material changes into the vapour phase and an anisotropically structured coating (1) is produced on the substrate. An anisotropic structured layer of the coating material is deposited on the substrate.In this coating, elongate particles (10), which form an anisotropic micro-structure, are aligned standing largely perpendicular to the substrate surface and low-material transitional zones (11, 12) bound the particles from one another.

L'invention concerne un procédé de projection au plasma, à savoir un procédé de recouvrement, selon lequel un matériau utilisé pour le recouvrement est projeté sous forme d'un faisceau pulvérulent sur la surface d'un substrat (2) métallique. Le matériau de recouvrement est, à une pression de procédé basse, à savoir inférieure à 10 000 Pa, injecté dans un plasma défocalisant le faisceau pulvérulent et, dans ce plasma, il est partiellement ou complètement fondu. A cet effet est généré un plasma présentant une enthalpie spécifique suffisamment élevée, de sorte qu'une proportion importante, atteignant au moins 5 % en poids, du matériau de recouvrement passe en phase vapeur. Sur le substrat, avec le matériau de recouvrement, est déposée une couche anisotropiquement structurée. Dans cette couche se trouvent des particules longitudinales (19) qui forment une microstructure anisotrope et sont, dans une large mesure, orientées perpendiculairement à la surface du substrat. Ces particules délimitent, les unes par rapport aux autres, des zones de transition (11, 12) pauvres en matériau.

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