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Coated article with dual-layer protective overcoat of nitride and zirconium or chromium oxide

  • US 20040197574A1
  • Filed: 04/03/2003
  • Published: 10/07/2004
  • Est. Priority Date: 04/03/2003
  • Status: Active Grant
First Claim
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1. A coated article including a layer system supported by a glass substrate, the layer system comprising:

  • a first dielectric layer supported by the glass substrate;

    an infrared (IR) reflecting layer supported by the glass substrate and provided over at least the first dielectric layer; and

    a multi-layer overcoat provided over at least the IR reflecting layer, wherein the overcoat includes a first layer comprising silicon nitride having an index of refraction “

    n”

    of from 1.7 to 2.5 and a second layer comprising zirconium oxide located over the first layer comprising silicon nitride.

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