Wet chemical method of producing transparent metal films

Abstract

Abstract THIS INVENTION RELATES TO WET CHEMICAL METHODS OF PROVIDING NON-CONDUCTIVE TRANSPARENT SUBSTANCES 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 BEN PROVIDED. AS ONE EMBODIMENT, THIS INVENTION RELATES TO THE FORMATION OF EXTREMELY UNIFORM TRANSPARENT METAL-BORONFILMS, 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, I.E., BY CONTACTING THE GLASS WITH A DILUTE AQUEOUS SOLUTION OF A STANNOUS SALT TO SENSITIZE SAID GLASS; THEREAFTER CONTACTING SAID GLASS WITH AN AQUEOUS PALLADIUM SALT TO FURTHER ACTIVATE SAID GLASS; AND THEN SPRAYING TWO AQUEUS 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 REFLECTIVELY (WITHIN LIMITS SPECIFIED HEREIN), WHICH ARE SUBSTANTIALLY FREE FROM LOCALIZED DEVIATIONS THAT ARE VISIBLE TO THE EYE, AND WHICH REFLECT A LARGE PERCENTAGE OF THE SOLAR RADIATION IMPINGED THEREON ARE PRODUCED IN THIS MANNER.

Inventors

• 👤 C Greenberg
• 👤 R Crissman

Bibliographic Details