Coated article with ion treated underlayer and corresponding method
AssigneeGuardian Industries Corp.
InventorVijayen S. Veerasamy
Life of this patent
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Abstract
A coated article is provided that may be used as a vehicle windshield, insulating glass (IG) window unit, or the like. Ion beam treatment is performed on a layer(s) of the coating. For example, a silicon nitride layer of a low-E coating may be ion beam treated. It has been found that ion beam treatment, for example, of a silicon nitride underlayer is advantageous in that sodium migration from the glass substrate toward the IR reflecting layer(s) can be reduced during heat treatment.
Claims21
A coated article including a glass substrate which supports a coating thereon, the coating comprising at least the following layers:
- an ion beam-treated layer comprising silicon nitride supported by the glass substrate;
- an IR reflecting layer located on and supported by the substrate, the IR reflecting layer being located over at least the layer comprising silicon nitride;
- and
- wherein the ion beam-treated layer comprising silicon nitride comprises nitrogen-doped Si3N4.
A coated article including a glass substrate which supports a coating thereon, the coating comprising at least the following layers:
- a layer comprising nitrogen-doped silicon nitride which has an average hardness of at least 22 GPa, wherein the nitrogen-doped silicon nitride is doped with at least 2% nitrogen;
- an IR reflecting layer located on the substrate over at least the layer comprising silicon nitride;
- and
- wherein the coated article has a visible transmission of at least about 70% and a sheet resistance of less than or equal to about 6 ohms/square.
A coated article including a glass substrate which supports a coating thereon, the coating comprising at least the following layers:
- a layer comprising silicon nitride supported by the glass substrate;
- an IR reflecting layer located on and supported by the substrate, the IR reflecting layer being located over at least the layer comprising silicon nitride;
- wherein the layer comprising silicon nitride comprises nitrogen-doped Si3N4, and wherein at least some excess nitrogen present in the layer due to doping is not bonded to silicon.
Dependencies are inferred from the claim text.