Process for depositing pyrocarbon coatings in a fluidized bed

Details Process for depositing pyrocarbon coatings in a fluidized bed Process for depositing pyrocarbon coatings in a fluidized bed

C - Chemistry, Metallurgy

23

C

C23C 16/26 (2006.01) A61L 27/30 (2006.01) C23C 16/442 (2006.01) C23C 16/458 (2006.01)

Patent

CA 2198134

Pure unalloyed pyrocarbons having wear resistance suitable for use in pyrocarbon-coated heart valve compo-nents and having mechanical properties, such as flexural strength and toughness, superior to commercial silicon--alloyed pyrocarbons are deposited in fluidized bed coaters. Coating conditions are carefully controlled so as to main-tain a precise bed size within a defined coating enclosure which will assure a substantially constant surface deposition temperature that in turn assures deposition of homogenous unalloyed pyrocarbons having these improved mechanical properties.

Pyrocarbones purs non alliés d'une haute résistance à l'usure aptes à être utilisés dans des composants de valvules cardiaques revêtus de pyrocarbone et dont les propriétés mécaniques telles que la résistance à la flexion et la dureté dépassent celles des pyrocarbones alliés au silicium du commerce. Les conditions d'application du revêtement sont soigneusement contrôlées de façon à obtenir une taille de lit précise dans une chambre d'application bien délimitée, ce qui assure une température de dépôt sensiblement constante, qui à son tour assure le dépôt de pyrocarbones homogènes et non alliés présentant lesdites caractéristiques mécaniques améliorées.

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