polymer-based nanodiamond coating and applications
innovates a unique technology to produce the hard carbon film consisted of
nanocrystalline diamonds in amorphous carbon matrix from a special
diamond-like polymer precursor. The polymer precursor is easily soluble
in organic solvents, and can be applied to various substrates by
spinning, dipping, draining, brushing or printing. The films can be
coated on complex shape with large area both inside and outside
simultaneously. By a heat-treatment, the polymer precursor can be
converted into hard carbon film which has excellent mechanical and
wear properties. Currently, our hard carbon films have been used as
graphite coating for the heat-corrosion and wear-resistant films, such as
moulds, electrodes, extruders and cylinders, as ceramic coating to
enhance surface hardness and wear resistance for tools application in
milling, cutting, boring; bearings, dice, rollers.
Comparison of the mechanical and wear properties of graphite, normal
CVD hard-carbon on graphite and Nanocs
hard-carbon on graphite.
The hardness of the Nanocs hard carbon
film coated on graphite can be enhanced 20-50 times compared to graphite, 2-5 times
compared to normal CVD hard carbon film coated on
graphite. The wear resistance property and life time of the Nanocs
hard carbon film coated on graphite can be enhanced significantly (above
100 times), comparing with graphite or normal CVD hard carbon film
coated on graphite.
Nanocs polymer-based nanodiamond coating
Structure and Morphology:
The hard carbon film converted from polymer precursor consists of
diamond crystals and amorphous carbon matrix.
The hardness and Young's modulus of the hard carbon films were
determined by a Nanoindenter using continuous stiffness measurement. The hardness and Young’s modulus of Nanocs
hard carbon film on graphite is about 9 and 120 Gpa, respectively, while the hardness and Young’s modulus of graphite substrate is about
0.25 and 3 GPa. For CVD hard carbon film on graphite, the hardness and
Young’s modulus is 2.5 and 30 Gpa, respectively. Nanocs hard carbon film
coated graphite is much higher than that of the graphite substrate or
normal CVD hard carbon coated graphite.
The hardness and Young’s modulus of Nanocs
hard carbon film on Si3N4 ceramic substrate is
about 28 and 340 Gpa, whilst the hardness and Young’s modulus of Si3N4
ceramic substrate is about 9 and 240 Gpa, respectively. Clearly, Nanocs
hard carbon coating can enhance the surface hardness of the ceramic
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