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Abrasion wear resistant coated substrate product

  • US 5,268,217 A
  • Filed: 08/03/1992
  • Issued: 12/07/1993
  • Est. Priority Date: 09/27/1990
  • Status: Expired due to Term
First Claim
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1. A coated substrate product comprised of a substantially optically transparent substrate which is transparent to light in the visible region of 350 to approximately 750 nanometers and which comprises a material selected from the group consisting of an amorphous material, a single crystal, polycrystalline materials, glass, salt materials, ceramic materials and mixtures thereof and at least one composite layer having a thickness in the range of 1 μ

  • m to about 20 μ

    m, said composite layer comprising a chemically vapor deposited first interlayer bonded to said substrate, and a chemically vapor deposited outer layer of substantially optically transparent diamond-like carbon which is transparent to light in the visible region of 350 to approximately 750 nonometers and is bonded to said first interlayer and away from said substrate;

    said first interlayer and comprising a substantially optically transparent material devoid of alkali metal atoms and fluorine, which first interlayer is transparent to light in the visible region of 350 to approximately 750 nonometers and is selected from the group consisting of silicon nitride, titanium nitride, tantalum nitride, hafnium nitride, zirconium nitride, boron nitride, yttrium oxide, germanium oxide, hafnium oxide, silicon oxide, silicon dioxide, tantalum oxide, titanium oxide, zirconium oxide, silicon carbide, germanium carbide, mixtures thereof, and chemically bonded combinations thereof and capable of forming a strong chemical bond to said substrate and a strong chemical bond to said diamond-like carbon outer layer, whereby said product has greatly improved wear resistance for severe abrasive environments.

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