CPC C25D 5/12 (2013.01) [B32B 15/04 (2013.01); C22C 27/06 (2013.01); C23C 18/165 (2013.01); C23C 18/1616 (2013.01); C23C 18/1692 (2013.01); C23C 18/32 (2013.01); C23C 18/50 (2013.01); C25D 3/56 (2013.01); C25D 5/50 (2013.01); C25D 7/008 (2013.01); F01D 5/187 (2013.01); B32B 2603/00 (2013.01); F01D 5/288 (2013.01); F05D 2230/90 (2013.01); F05D 2300/121 (2013.01); F05D 2300/132 (2013.01); F05D 2300/21 (2013.01); F05D 2300/2112 (2013.01); F05D 2300/611 (2013.01); F05D 2300/701 (2013.01)] | 15 Claims |
1. An airfoil comprising:
an internal surface having disposed thereon:
a thermally grown oxide layer that comprises alumina and chromium oxide; and
a layer comprising Ni—Cr/aluminide or Cr/aluminide disposed between the layer comprising alumina and chromium oxide and the internal surface of the airfoil; where the layer comprising Ni—Cr/aluminide or Cr/aluminide contains aluminum and chromium that vary in amount inversely with one another with distance from the internal surface of the airfoil or from a surface of the thermally grown oxide layer.
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