METHOD FOR INCREASING RATE OF COATING USING VAPORIZED REACTANTS
First Claim
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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.
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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.
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Citations
2 Claims
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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.
- 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;
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2. The method according to claim 1 wherein the coating reactant is a metal trifluoroacetylacetonate.
Specification