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Coated articles having a protective coating and cathode targets for making the coated articles

  • US 6,916,542 B2
  • Filed: 04/24/2003
  • Issued: 07/12/2005
  • Est. Priority Date: 10/22/2001
  • Status: Expired due to Term
First Claim
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1. An article, comprising:

  • a substrate;

    a functional coating deposited over at least a portion of the substrate; and

    a protective coating deposited over at least a portion of the functional coating, wherein the functional coating and the protective coating define a coating stack, wherein the protective coating provides the coating stack with an emissivity higher than the emissivity of the functional coating alone, wherein the protective coating has a thickness in the range of greater than 100 Å

    to less than or equal to 10 microns and the protective coating has a refractive index in the range of 1.4 to 2, and wherein the protective coating comprises a first layer formed over at least a portion of the functional coating and a second layer formed over at least a portion of the first layer, wherein the first layer comprises 50 wt. % to 99 wt. % alumina and 50 wt. % to 1 wt. % silica, and the second layer comprises 50 wt. % to 99 wt. % silica and 50 wt. % to 1 wt. % alumina.

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