Ornamental article and process for producing the same
AssigneeKYOCERA Corporation
InventorsKazunori Takenouchi, Mitsuhiko Koshida, Kouichi Kijima, Shinichi Hayashi
Life of this patent
Estimating the term…
Abstract
An ornamental article comprises a base at least a surface portion of which comprises a transition metal selected from Group 4a, 5a and 6a elements in the periodic table or its alloy; a hard carbon film covering a surface of the base; and an intermediate layer interposed between the base and the hard carbon film and containing a carbide of the transition metal. The hard carbon film has a high adhesion strength to its base, and is superior in corrosion resistance and abrasion resistance.
Claims9
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;
- and
- a hard carbon film of between 0.1 and 10 μm thick covering the intermediate layer, the hard carbon film comprising a mixture of diamond precursors, measured as H1, a Raman spectroscope peak in a wavelength range of 1160±40 cm−1, diamond crystals, measured as H2, a Raman spectroscope peak in a wavelength range of 1340±40 cm−1, and amorphous carbon, measured as H3, a Raman spectroscope peak in a wavelength range of 1500±60 cm−1, wherein Raman spectroscopic analysis of the hard carbon film satisfies the relationships of that 0.02≦H1/H2 and H2<H3 where H1, H2, and H3 are peak heights measured from a base line extending between point of lowest intensity.
An ornamental article comprising a base and a hard carbon film covering a surface of the base, wherein the hard carbon film has peaks in wavelength ranges of 1500±60 cm−1, 1160±40 cm−1 and 1340±40 cm−1 as determined by Raman spectroscopy, and has a density of not less than 3.1 g/cm3 and a thickness of 0.15 to 2 μm.
Dependencies are inferred from the claim text.