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The peg-nail structure selective laser modification of plasma sprayed YSZ thermal barrier coatings
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South China University of Technology,Guangzhou Research Institute of Non-ferrous Metals

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    Abstract:

    In this paper, yttria partially stabilized zirconia (YSZ) thermal barrier coatings (TBCs) were deposited by air plasma spraying (APS) method on nickle-based superalloy with initially sprayed NiCoCrAlYTa bond coat. After that, the surface of the plasma sprayed TBCs was subjected to the peg-nail structure selective laser modification using a Nd:YAG pulsed laser. The microstructure and performance of the plasma sprayed and laser modified YSZ coatings were investigated. The results revealed that the peg-nail structure selective laser modification helped to reduce the surface roughness considerably, eliminate to surface porosities and produced a network of continuous cracks perpendicular to the surface. The microstructure of laser modified area consisted of columnar grains in the cross-section and equiaxed grains on the surface. XRD patterns showed that both as-sprayed and the peg-nail structure laser modified coatings consisted of nonequibrium tetragonal (T'') phase, however, monoclinic (M) phase disappeared and intensity of T'' phase slightly increased in the range of 72-76°(2θ) after the peg-nail structure laser modification. It has been found that the average bond strength YSZ coatings was enhanced from 7.3 MPa to 13.3 MPa after the peg-nail structure laser modification. Thermal insulation capability of the peg-nail structure laser modified TBCs, as compared to the as-sprayed TBCs, was decreased due to microstructure change in the ceramic top coat.

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[changfa, zhou ke song. The peg-nail structure selective laser modification of plasma sprayed YSZ thermal barrier coatings[J]. Rare Metal Materials and Engineering,2017,46(3):577~584.]
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History
  • Received:November 18,2014
  • Revised:May 28,2015
  • Adopted:July 10,2015
  • Online: May 18,2017
  • Published: