Thermally insulating glass laminates with a non-uniform coating layer and a plurality of sealed cavities of gas molecules
View Patent ↗The present disclosure describes thermally insulating glass laminates that mitigate or prevent heat loss from heated cavities. In some embodiments, the thermally insulating glass laminates comprise a non-uniform low or non-conductive coating layer that forms a chemical bond with at least one inner surface of the substrates, wherein the coating layer can have a thickness of about 0.010 inches or less and forms a pattern that contacts about 30% or less of at least one inner surface of a substrate and helps form a plurality of sealed cavities of gas molecules between the substrates. Since there is a small amount of gas molecules in each cavity, convective heat transfer between the substrates is minimized thereby minimizing heat loss through the laminates into the surrounding environment.
1. A thermally insulating laminate comprising:
a first glass substrate having an inner surface;
a second glass substrate having an inner surface; and
a non-uniform low or non-conductive coating layer between the first glass substrate and the second glass substrate that forms a chemical bond with at least one of the inner surfaces,
wherein the coating layer has a thickness of about 0.010 inches or less, and comprises a plurality of interconnected segments with a plurality of voids, and
wherein the inner surface of the first glass substrate, the inner surface of the second glass substrate, the coating layer, and the voids define a plurality of sealed cavities between the substrates.
2. The laminate of claim 1 , wherein there are about 5 to about 400 cavities per square centimeter of the coating layer.
3. The laminate of claim 1 , wherein a width of the coating layer measured between each cavity is about 0.01 to about 0.5 millimeters.
4. The laminate of claim 1 , wherein the thickness of the coating layer is about 0.005 inches or less.
5. The laminate of claim 1 , wherein the thickness of the coating layer is about 0.001 inches or less.
6. A method of forming the laminate of claim 1 , comprising the steps of:
applying a coating composition to the first substrate;
heating the coating composition to adhere the coating composition to the first substrate;
applying the second substrate on the heated coating composition; and
firing the heated coating composition to form the chemical bond.
7. A method of forming the laminate of claim 1 , comprising the steps of:
applying a coating composition to the first substrate;
applying the second substrate on the coating composition; and
firing the coating composition to form the chemical bond.
8. The laminate of claim 1 , wherein the coating layer comprises an enamel, a frit, or a combination thereof, and wherein the enamel, frit, or combination thereof comprises a ceramic compound, a glass compound or a combination thereof.
9. The laminate of claim 1 , wherein the coating layer is transparent.
10. The laminate of claim 1 , wherein the coating layer has a conductivity lower than a conductivity of the first and second substrates.
11. The laminate of claim 1 , wherein there is no vacuum in the cavities.
12. An oven comprising the laminate of claim 1 , wherein the oven operates at a temperature above about 175° C.
13. The oven of claim 12 , wherein a window or site glass of the oven comprises the laminate.
14. The laminate of claim 1 , wherein the chemical bond is a Si—O bond.
15. The laminate of claim 1 , wherein the voids comprise about 30% or less of the coating layer.