Nanocrystalline interlayer coating for increasing service life of thermal barrier coating on high temperature components

摘要

A coated substrate including a substrate having a surface, a bond coat proximate to the substrate surface, a yttrium stabilized zirconia (YSZ) thermal barrier layer opposite the substrate surface, and at least one interlayer disposed between the bond coat and the thermal barrier layer, wherein the interlayer contains an alloy having a nanocrystalline grain structure. A method for coating a substrate to be exposed to high in service temperatures and/or temperature cycles including depositing a bond coating on substrate surface, depositing at least one nanocrystalline interlayer on the bond coat opposite the substrate surface, and depositing a yttrium stabilized zirconia (YSZ) thermal barrier coating on the nanocrystalline interlayer opposite the bond coat, wherein the service life of the YSZ thermal barrier coating is extended relative to a substrate coated with the bond coating and the thermal barrier without the interlayer disposed therebetween.

主权项

1. A coated substrate comprising:
a substrate having a surface; a bond coat proximate to the substrate surface, wherein said bond coat comprises NiCoCrAlY and exhibits a duplex structure containing fine β-phase [(Co and/or Ni)Al] particles in a Ni solid solution matrix; and at least one interlayer disposed between the bond coat and a yttrium stabilized zirconia (YSZ) thermal barrier layer, wherein the interlayer comprises NiCoCrAlSi and exhibits a grain size of less than 100 nm as measured by x-ray diffraction, wherein said bond coat is susceptible to loss of Al at elevated temperature and formation of an aluminum oxide layer as between said bond coat and said yttrium stabilized zirconia thermal barrier layer and said interlayer slows down said loss of Al from said bond coat at elevated temperature.