Physical vapor deposition of decorative and/or protective coating on substrate e.g. watch casing, by depositing underlayer, in inert atmosphere, on substrate, and progressively adding hydrocarbon gas to atmosphere to obtain stack of layers

摘要

The method comprises depositing an underlayer (21), in an inert atmosphere, on a substrate (35) by pulverization or using magnetron sources, progressively adding a hydrocarbon gas to the inert atmosphere according to a profile of determined concentration by maintaining active sources or magnetron sources to obtain a stack of layers (15) with a gradually increasing proportion of carbon, and increasing a partial pressure of reactive gas to a saturation level at which an amorphous carbon layer (12) is deposited. The method comprises depositing an underlayer (21), in an inert atmosphere, on a substrate (35) by pulverization or using magnetron sources, progressively adding a hydrocarbon gas to the inert atmosphere according to a profile of determined concentration by maintaining active sources or magnetron sources to obtain a stack of layers (15) with a gradually increasing proportion of carbon, increasing a partial pressure of reactive gas to a saturation level at which an amorphous carbon layer (12) is deposited, maintaining the partial pressure at the saturation level until obtaining a desired thickness of coating, applying a negative polarization or pulsed direct current on the substrate, and detecting the saturation level by monitoring a layer deposition speed or by observing electric parameters of magnetron sources. The underlayer has a thickness of 200-500 nm. The deposition speed of stack of layers and/or carbon layer is 400-800 nm/hour.