Magnesium oxide coated glass article and a method for depositing magnesium oxide coatings on flat glass
AssigneePilkington North America, Inc.
InventorsSrikanth Varanasi, David A. Strickler
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Abstract
An atmospheric chemical vapor deposition process for laying down a magnesium oxide coating on a moving glass substrate through the reaction of an organic ester and an organomagnesium compound. The resulting article has a magnesium oxide coating which can be of substantial thickness because of the high deposition rates attainable with the novel process. Preferably, the coating deposition rates resulting from the method of the present invention may be greater than or equal to 15 Å per second.
Claims20
An atmospheric chemical vapor deposition process for depositing a magnesium oxide coating on a surface of a hot, moving glass substrate comprising:
- providing a uniform vaporized reactant mixture comprising an organomagnesium compound, an organic ester and an inert carrier gas;
- maintaining the precursor gas mixture at a temperature below the temperature at which the organomagnesium compound reacts with the ester to form a magnesium oxide coating while delivering the gaseous mixture to a coating chamber which opens onto the hot glass substrate;
- and
- introducing the precursor gas mixture into the coating chamber and directing the precursor gas mixture to a surface of the substrate, wherein the gaseous mixture is heated to above the reaction temperature of the organomagnesium and the ester and incorporates oxygen from the ester to cause the deposition of the magnesium oxide coating on the surface of the substrate at a deposition rate of greater than or equal to 15 Å per second.
The process for depositing the magnesium oxide coating on the substrate recited in claim 5, where the precursor gas mixture flows over the float glass ribbon to be coated under laminar flow conditions.
A glass article, comprising:
- (a) a glass substrate having a surface,
- (b) a two component iridescence-suppressing interlayer comprising a top transparent thin film of silicon dioxide and a bottom transparent thin film of magnesium oxide, deposited on and adhering to the surface of the glass substrate;
- and
- (c) a first coating of a transparent thin film deposited on and adhering to said iridescence-suppressing interlayer.
A glass article, comprising:
- (a) a glass substrate having a surface,
- (b) a first coating comprising magnesium oxide, deposited on and adhering to the surface of the glass substrate,
- (c) a second coating of a transparent thin film having a refractive index between 1.9 and 2.2 deposited on and adhering to said magnesium oxide first coating;
- and
- (d) a third coating of a transparent thin film deposited on and adhering to said first coating to form a coated glass article, said second coating having a refractive index greater than a refractive index of said third coating.
Dependencies are inferred from the claim text.