Patent ID: 6284376
Filing Date: 2001-09-04
Classification: B32B,C23C,Y10T

Abstract:
An ornamental article comprising:a base at least a surface of which comprises at least one transition metal selected from the group consisting of titanium, vanadium, chromium, zirconium, niobium, molybdenum, hafnium, tantalum and tunosten or an alloy containing the transition metal as its principal component;an intermediate layer containing a carbide of the transition metal covering the surface of the base; anda hard carbon film of between 0.1 and 10 .mu.m thick covering the intermediate layer, the hard carbon film comprising a mixture of diamond precursors, measured as H.sub.1, a Raman spectroscope peak in a wavelength range of 1160.+-.40 cm.sup.-1, diamond crystals, measured as H.sub.2, a Raman spectroscope peak in a wavelength range of 1340.+-.40 cm.sup.-1, and amorphous carbon, measured as H.sub.3, a Raman spectroscope peak in a wavelength range of 1500.+-.60 cm.sup.-1, wherein Raman spectroscopic analysis of the hard carbon film satisfies the relationships of that 0.02.ltoreq.H.sub.1 /H.sub.2 and H.sub.2 <H.sub.3 where H.sub.1, H.sub.2, and H.sub.3 are peak heights measured from a base line extending between point of lowest intensity.