GRADED HYDROGEN-FREE CARBON-BASED HARD MATERIAL LAYER COATED ONTO A SUBSTRATE
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United States of America Patent
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Issued Date -
Sep 1, 2022
app pub date -
Jul 31, 2020
filing date -
Jul 31, 2019
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Abstract
A method to produce a hard coating onto a substrate, wherein the hard coating comprises a hydrogen-free amorphous carbon coating, wherein the amorphous carbon coating is deposited onto the substrate using a cathodic arc discharge deposition technique, wherein a bias voltage is applied to the substrate with an absolute value that is greater than 0 V, preferably greater than 10 V and less than 1000 V, and wherein the absolute value of the bias voltage is increased during the coating process to obtain a first structure and a second structure and a gradient between the first and the second structure along the coating thickness, wherein the first and the second structure comprise sp2 and sp3 carbon bonds but differ in their relative concentration, wherein at least one coating pause is applied during the coating process in order to reduce the substrate temperature during the coating pause.
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