Substrate coated with a layered structure comprising a tetrahedral carbon layer and a softer outer layer
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United States of America Patent
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May 24, 2011
Grant Date -
Sep 11, 2008
app pub date -
Jul 13, 2006
filing date -
Aug 18, 2005
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Abstract
The invention relates to a metal substrate coated at least partially with a layered structure. The layered structure comprises an intermediate layer deposited on the metal substrate and an amorphous carbon layer deposited on the intermediate layer. The amorphous carbon layer has a Young's modulus lower than 200 GPa. The intermediate layer comprises a tetrahedral carbon layer having a Young's modulus higher than 200 GPa. The invention further relates to a method to reduce the wear on a counterbody of a metal substrate coated with a tetrahedral carbon coating.
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