Coating Having Solar Control Properties for a Substrate, and Method and System for Depositing Said Coating on the Substrate

Abstract

The present invention relates to coating glass for architectural or automotive use, either monolithic or laminated, having solar control properties. The coating consists of several layers of different metal oxide semiconductors (TiO 2 , ZnO, ZrO 2 , SnO 2 , Al 2 O 3 ) and a layer of metallic nanoparticles, which when superimposed on a pre-established order give the glass solar control properties. In particular the use of protective layers of n-type semiconductors around the metallic nanoparticles layer. It also relates to the method for obtaining the coating by means of the aerosol-assisted chemical vapor deposition technique, using precursor solutions containing an organic or inorganic salt (acetates, acetylacetonates, halides, nitrates) of the applicable elements and an appropriate solvent (water, alcohol, acetone, acetylacetone, etc.). The synthesis is performed at a temperature between 100 and 600° C. depending on the material to be deposited. A nebulizer converts the precursor solution into an aerosol which is submitted with a gas to the substrate surface, where due to the temperature the thermal decomposition of the precursor occurs and the deposition of each layer of the coating occurs.

What is claimed is: 
     
         1 . A system for depositing a solar control coating on a substrate comprising:
 a) a heating system configured to heat the substrate;   b) a nebulizer coupled to the heating system, which includes an outlet nozzle of a precursor solution for depositing a precursor solution on the substrate surface;   c) a nozzle drive system coupled to the outlet nozzle to move the outlet nozzle above the substrate configured to deposit the precursor solution uniformly over the entire substrate surface thereby forming a uniform coating; and   d) a gas extraction system configured to avoid contamination of the deposited coating.   
     
     
         2 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the nebulizer is pneumatic, electrostatic, or ultrasonic type. 
     
     
         3 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the heating system is configured to heat the substrate to a temperature between 100° C. and 600° C. 
     
     
         4 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the nozzle drive system is configured enable the outlet nozzle to travel at a speed of from 0.1 to 5 cm/min thereby permitting varying the thickness of the coating. 
     
     
         5 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the nebulizer utilizes an aerosol-assisted chemical vapor deposition (AACVD) technique. 
     
     
         6 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the concentration of the precursor solution is from 0.001 to 0.2 mol·dm −3 . 
     
     
         7 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the nebulizer includes a flow controller and a pressure regulator for introducing a carrier gas mixed with the precursor solution. 
     
     
         8 . The system for depositing a solar control coating on a substrate according to  claim 7 , wherein the carrier gas is air, argon, nitrogen, or a similar gas. 
     
     
         9 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the heating means comprises a heating plate. 
     
     
         10 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the heating means comprises a chamber. 
     
     
         11 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the precursor solution comprises organometallic precursors or inorganic compounds. 
     
     
         12 . The system for depositing a solar control coating on a substrate according to  claim 10 , wherein the inorganic or organometallic precursors are acetates, acetylacetonates, chlorides, nitrates, or halides. 
     
     
         13 . The system for depositing a solar control coating on a substrate according to  claim 1 , wherein the solar control coating comprises:
 i) a first active protective layer residing over one surface of the substrate;   ii) a non-continuous metallic nanoparticle layer residing over said first active protective layer;   iii) a second active protective layer residing over said metallic nanoparticle layer; and   iv) a dielectric layer.   
     
     
         14 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the non-continuous metallic nanoparticle layer comprises metallic nanoparticles that are uniformly and homogeneously distributed in the first layer of the substrate. 
     
     
         15 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the non-continuous metallic metallic nanoparticle layer comprises gold (Au), silver (Ag), platinum (Pt) or palladium (Pd). 
     
     
         16 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the non-continuous metallic nanoparticle layer comprises metallic nanoparticles having a diameter of less than 30 nm. 
     
     
         17 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the dielectric layer comprises Al 2 O 3 . 
     
     
         18 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the first active protective layer or the second active protective layer has a thickness in a range between 10 and 70 nm. 
     
     
         19 . The system for depositing a solar control coating on a substrate according to  claim 13 , wherein the first active protective layer and second active protective layer comprise a metal oxide. 
     
     
         20 . The system for depositing a solar control coating on a substrate according to  claim 19 , wherein said metal oxide comprises titanium or zinc.