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Fine-grained metallic coatings having the coeficient of thermal expansion matched to one of the substrate

  • US 8,129,034 B2
  • Filed: 02/11/2011
  • Issued: 03/06/2012
  • Est. Priority Date: 12/17/2004
  • Status: Active Grant
First Claim
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1. An article comprising(a) a permanent substrate which at room temperature has a minimum coefficient of thermal expansion of 0×

  • 10

    6
    K

    1
    ;

    (b) a fine grained metallic coating extending over at least part of an inner and/or outer surface on the permanent substrate, having an average grain size between 2 and 1,000 nm, and a minimum coefficient of thermal expansion of 0×

    10

    6
    K

    1
    ; and

    (c) said article exhibiting no delamination and the displacement of the coating relative to the underlying substrate is less than 1% after said article has been exposed to one temperature cycle consisting of exposure to liquid nitrogen for one minute followed by exposure to 90°

    C. hot water for one minute, or one temperature cycle according to ASTM B553-71 service condition 1, 2, 3 or 4;

    whereinsaid fine-grained metallic coating has a ductility ranging from 1 to 15%.

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