Stock material or miscellaneous articles – Self-sustaining carbon mass or layer with impregnant or...
Reexamination Certificate
2011-08-30
2011-08-30
Turner, Archene (Department: 1784)
Stock material or miscellaneous articles
Self-sustaining carbon mass or layer with impregnant or...
C428S216000, C428S336000, C428S698000, C428S704000
Reexamination Certificate
active
08007910
ABSTRACT:
A multilayer coating (MLC) is composed of two chemically different layered nanocrystalline materials, nanodiamond (nanoD) and nano-cubic boron nitride (nono-cBN). The structure of the MLC and fabrication sequence of layered structure are disclosed. The base layer is preferably nanoD and is the first deposited layer serving as an accommodation layer on a pretreated substrate. It can be designed with a larger thickness whereas subsequent alternate nano-cBN and nanoD layers are typically prepared with a thickness of 2 to 100 nm. The thickness of these layers can be engineered for a specific use. The deposition of the nanoD layer, by either cold or thermal plasma CVD, is preceded by diamond nucleation on a pretreated and/or precoated substrate, which has the capacity to accommodate the MLC and provides excellent adhesion. Nano-cBN layers are directly grown on nanodiamond crystallites using ion-assisted physical vapor deposition (PVD) and ion-assisted plasma enhanced chemical vapor deposition (PECVD), again followed by nanodiamond deposition using CVD methods in cycles until the intended number of layers of the MLC is obtained.
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Bello Igor
Chong Yat Ming
Lee Shuit-Tong
Leung Kar Man
Li He-qin
City University of Hong Kong
Heslin Rothenberg Farley & & Mesiti P.C.
Turner Archene
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