Engine component
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United States of America Patent
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Nov 3, 2015
Grant Date -
Apr 17, 2014
app pub date -
Feb 9, 2012
filing date -
Feb 10, 2011
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Abstract
The present invention has the objective of solving the problems encountered in coating engine components (engine blocks or sleeves, either fixed or movable) having at least one cylindrical cavity and composed mainly by iron or aluminum, providing them with a coating (3) that is subdivided into three different layers, which are deposited onto the metallic substrate (1), which are first sub-layer (21) comprising at least 80% silicon deposited onto the substrate (1) with the function of providing interface with good adhesion between the substrate (1) and the subsequent sub-layers, which contain hydrogenated amorphous carbon, second sub-layer (22) of transition comprising a percentage of silicon and of hydrogenated amorphous carbon (a-C:H:Si) and, finally, on the working surface, third sub-layer (23) having a pure composition of hydrogenated amorphous carbon (a-C:H), wherein such coating (3) is generated by the hollow cathode effect (HCE) by plasma-enhanced chemical vapor deposition (PECVD).
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