Tungsten carbide coatings and process for producing them

C - Chemistry – Metallurgy – 23 – C

Patent

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Details

C23C 16/32 (2006.01) B23B 15/00 (2006.01) C23C 16/452 (2006.01) C23C 28/00 (2006.01)

Patent

CA 2366500

New tungsten carbides alloyed with fluorine in amounts up to 0.5 wt% and possibly with fluorocarbon compositions are described. It is possible to produce them by means of a new process of chemical vapour deposition, in which tungsten hexafluoride, hydrogen and a carbon-containing gas are used. A specific feature of the new process is the preliminary thermal activation of the carbon-containing gas. The tungsten carbide coatings are deposited on construction materials and items made from them. They possess enhanced resistance to wear, corrosion and chemicals.

Cette invention concerne de nouveaux carbures de tungstène qui sont dopés au fluor dans une quantité allant jusqu'à 0,5 % en poids, et qui peuvent également être dopés à l'aide de compositions de fluorocarbone. Ces carbures de tungstène sont produits par un nouveau procédé de déposition chimique en phase vapeur, ladite phase contenant de l'hexafluorure de tungstène, de l'hydrogène et un gaz contenant du carbone. Ce nouveau procédé se caractérise par l'activation thermique préalable du gaz contenant du carbone. Ces revêtements de carbure de tungstène sont appliqués sur des matériaux de construction et sur des articles obtenus à partir de ces derniers. Ces revêtements possèdent une grande résistance à l'usure et à la corrosion ainsi qu'une grande stabilité chimique.

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