Patent ID: 7592068

Claim:
A coated article including a coating supported by a glass substrate, the coating comprising: a first dielectric layer comprising silicon nitride; an infrared (IR) reflecting layer comprising one or more of NbZr and NiCr located on the substrate over and contacting the first dielectric layer comprising silicon nitride; a second dielectric layer comprising silicon nitride located over and contacting the IR reflecting layer comprising, the IR reflecting layer comprising one or more of (i) an oxide of NbZr, and (ii) NiCr; and an overcoat layer comprising zirconium silicon oxynitride located on the substrate as an uppermost layer of the coating, wherein the zirconium silicon oxynitride is located over and contacts the second dielectric layer comprising silicon nitride and contains more zirconium than silicon, and wherein a Zr/Si ratio in the layer comprising zirconium silicon oxynitride is from about 5.0 to 20.0.