Multilayer coating including disordered, wear resistant boron carbon external coating
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United States of America Patent
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Jun 10, 1986
Issued Date -
N/A
app pub date -
Oct 9, 1984
filing date -
Sep 23, 1983
priority date (Note) -
Expired
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Abstract
A wear resistant multilayer coating is provided. The wear resistant coating comprises at least one internal layer and a thin, external layer of disordered boron and carbon applied to a substrate. The synergistic interaction of a hard internal layer and a lubricious boron and carbon layer provides a long lived tool coating. In a more specific embodiment, the external layer of the coating is disordered boron carbide. In accordance with one embodiment, the disordered boron and carbon external coating is of a composition B.sub.x C.sub.1-x where x is from about 0.60 to about 0.90.
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