METHOD FOR INCREASING RATE OF COATING USING VAPORIZED REACTANTS

• US 3,852,098 A
• Filed: 12/15/1972
• Issued: 12/03/1974
• Est. Priority Date: 12/15/1972
• Status: Expired due to Term

• Current Assignee: Harald Molketin, Karl H. Bloss
• Original Assignee: Harald Molketin, Karl H. Bloss
• Inventors: Bloss, Karl H., Molketin, Harald
• Primary Examiner(s): Kendall, Ralph S.
• Assistant Examiner(s): Pitlick, Harris A.
• Application Number:
  US05/315,384
• Time in Patent Office: 718 Days
• Field of Search: 117/16R,17.2R,107.1,123A 260/429J
• US Class Current: 427/226
• CPC Class Codes: C03C 17/00 Surface treatment of glass, not in the form of fibres or filaments, by coating optical coatings of optical elements G02B1/10
• CPC Class Codes: C03C 17/245 by deposition from the vapour phase
• CPC Class Codes: C03C 2217/229 Non-specific enumeration
• CPC Class Codes: C03C 2217/23 Mixtures
• CPC Class Codes: C03C 2218/152 by cvd
• CPC Class Codes: C23C 16/40 Oxides
• CPC Class Codes: C23C 16/406 of iron group metals
• CPC Class Codes: C23C 16/408 of copper or solid solutions thereof

Abstract

A glass substrate is coated with a metal-containing coating by heating the glass and contacting the hot glass with a gaseous mixture. The mixture is from 50 to 100 percent saturated with the vapors of a reactive metal compound at its temperature immediately before contacting the glass. The mixture is heated by the glass to a sufficient temperature causing the metal compound to react thereby depositing the coating.

Claims

1. A METHOD OF COATING A GLASS SUBSTRATE WITH A METAL OXIDE COATING COMPRISING THE STEPS OF:

A. DISPERSING A POWDERED COATING REACTANT HAVING A STANDARD VAPORIZATION ENTROPY OF AT LEAST 40 CLAUSIUS AND A MELTING POINT-TO-VAPORIZATION POINT SPAN OF LESS THAN ABOUT 120*C. INTO A STREAM OF AIR THAT IS SUFFICIENTLY HOT TO VAPORIZED COATING REACTANT SO THAT A MIXTURE OF AIR AND VAPORIZED COATING REACTANT IS FORMED;

B. MAINTAINING THE MIXTURE AT A TEMPERATURE ABOVE THAT AT WHICH IT IS SATURATED WITH THE COATING REACTANT AND BELOW THAT AT WHICH THE COATING REACTANT PYROLYZES;

C. HEATING THE GLASS SUBSTRATE TO A TEMPERATURE SUFFICIENT TO CAUSE THE COATING REACTANT TO PYROLYZE;

AND D. DELIVERING THE MIXTURE SUFFICIENTLY CLOSELY TO THE HOT GLASS SUBSTRATE TO CAUSE THE COATING REACTANT TO PYROLYZE FORMING A COATING ON THE SUBSTRATE.

2. The method according to claim 1 wherein the coating reactant is a metal trifluoroacetylacetonate.