The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 1983
Filed:
Jun. 22, 1982
Masahiko Hirose, Yokohama, JP;
Tsuyoshi Yasui, Yokohama, JP;
Yoshiharu Ochi, Yokohama, JP;
Masatoshi Nakagawa, Yokohama, JP;
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
There is disclosed a method for forming a decorative metallic nitride coating on the surface of a substrate comprising the steps of disposing said substrate to be coated as a cathode in a material gas atmosphere at a pressure of 0.1 to 10 Torr, with said substrate maintained at a temperature of 200.degree. to 1000.degree. C., and applying a voltage of 200 to 8000 V to said substrate to prepare a direct current glow discharge space in the vicinity of said substrate, the improvement which comprises using as said material gas a mixed gas of a halide of titanium, zirconium or hafnium; hydrogen; and nitrogen, and controlling the current density of the electric current flowing through said substrate to be within the range of 0.01 to 1 mA/cm.sup.2. The method according to the present invention provides a uniform and beautiful metallic nitride coating which has a metallic luster stable with time, is excellent in mar resistance, and is suitable for decoration. Further, according to the method of this invention, a decorative metallic nitride coating capable of varying a tone on a metallic luster surface over a wide range can be formed.