Transparent metal films and wet chemical method of producing the same

Abstract

Abstract THIS INVENTION RELATES TO WET CHEMICAL METHODS OF PROVIDING NONCONDUCTIVE TRANSPARENT SUBSTRATES WITH A TRANSPARENT COATING HAVING A METALLIC LUSTER AND GOOD UNIFORMITY. ESPECIALLY VALUABLE TRANSPARENT SUBSTRATES ARE PROVIDED IN WHICH THE CONTEMPLATED COATINGS ARE CERTAIN BORON CONTAINING METAL FILMS. TRANSPARENT ARTICLES HAVING ESPECIALLY ATTRACTIVE NEUTRAL COLORED FILMS OF NICKEL HAVE BEEN PROVIDED. OTHER ARTICLES HAVING FILMS OF COBALT AND/ OR IRON HAVE ALSO BEEN PROVIDED. AS ONE EMBODIMENT, THIS INVENTION RELATES TO THE FORMATION OF EXTREMLY UNIFORM TRANSPARENT METAL-BORON FILMS, SUCH AS NICKEL-BORON, COBALT-BORON, IRON-BORON OR MIXTURES THEREOF ON TRANSPARENT PLATES OF GLASS. THESE FILMS MAY BE PRODUCED BY CERTAIN ESSENTIAL STEPS INVOLVING: ACTIVATING A GLASS SUBSTRATE IN A CONVENTIONAL MANNER, E.G., BY CONTACTING SALT TO SENSITIZE SAID GLASS; THEREAFTER CONTACTING STANNOUS SALT TO SENSITIZE SAID GLASS; THEREAFTER CONTACTING SAID GLASS WITH AN AQUEOUS PALLADIUM SALT TO FURTHER ACTIVATE SAID GLASS; AND THEN SPRAYING TWO AQUEOUS ALKALINE SOLUTIONS-ONE CONTAINING A CHELATED METAL SALT AND THE OTHER CONTAINING A BOROHYDRIDE REDUCING AGENT-ONTO SAID ACTIVATED GLASS TO FORM A TRANSPARENT METAL AND BORON CONTAINING FILM BY REDUCTION OF THE METAL SALT. TRANSPARENT VIEWING CLOSURES WHICH EXHIBIT A CONTROLLED TRANSMITTANCE AND REFLECTIVITY (WITHIN LIMITS SPECIFIED HEREIN), WHICH ARE SUBSTANTIALLY FREE FROM LOCALIZED DEVIATIONS THAT ARE VISIBLE TO THE EYE, AND WHICH REFELCT A LARGE PERCENTAGE OF THE SOLAR RADIATION IMPINGED THEREON ARE PRODUCED IN THIS MANNER. D R A W I N G

Inventors

• 👤 R Miller

Bibliographic Details