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Fabrication of a metallic component for biomedical of aerospace applications coated with nanocrystalline diamond layer with intermediate graphite and amorphous carbon adhering layer diffused into substrate
Fabrication of a metallic component for biomedical of aerospace applications coated with nanocrystalline diamond layer with intermediate graphite and amorphous carbon adhering layer diffused into substrate
Metallic component is made by depositing an adhering layer (14) on a titanium substrate (2) comprising at least 10% graphite and amorphous carbon which diffuses into the substrate. A nanocrystalline diamond layer (1) is deposited which adheres to the first layer. The diamond is obtained from a gas mixture of carbon, oxygen and hydrogen with O:H ratio greater than 0.5 and O:C greater than 1. A method for the fabrication of a metallic component coated with a layer of diamond is of the type that consists of:- (a) fabricating a metallic substrate incorporating a surface to be coated of which the main constituent is titanium; (b) depositing, in a first stage, on this surface a layer of diamond adhering carbon incorporating at least 10% of graphite and amorphous carbon and destined to diffuse partially or entirely in the surface to be coated during a second stage; and (c) depositing, in a second stage, the diamond coating onto the adhering layer. The method is characterized in that the diamond coating is a layer of nanocrystalline diamond obtained from a gas mixture made up of carbon, oxygen and hydrogen in proportions such that the ratio O/H is greater than 0.5 and the ratio O/C greater than 1. Metallic components comprising a substrate coated with nanocrystalline diamond obtained by this method are also claimed.
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