Detail VaV (125982) ▪ FSI VUT v Brně

Český název

Microstructure modification of CGDS and HVOF sprayed CoNiCrAlY bond coat remelted by electron beam

Anglický název

Microstructure modification of CGDS and HVOF sprayed CoNiCrAlY bond coat remelted by electron beam

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

en

Originální abstrakt

In the present work two techniques are combined to optimize bond coat properties before thermal barrier coating (TBC) application, the cold gas dynamic spraying (CGDS) and electron beam remelting (EB). Results of the work focused on comparison of high velocity oxygen fuel (HVOF) and CGDS CoNiCrAlY bond coats are firstly presented. Than the effect of the electron beam remelting of the CoNiCrAlY coating manufactured by HVOF and CGDS deposition techniques is deeply investigated. The CoNiCrAlY bond coat to Inconel substrate interface displayed locations with very poor bonding, in larger extent for the states prepared by HVOF comparing to CGDS. The bond coats prepared by both ways being EB remelted are typically removal of the defects on the substrate to bond coat interface. The microstructure of the bond coat after this treatment is formed by Inconel fine grain layer being followed by the surface layer consisting of elongated dendritic microstructure. An increased porosity has been observed in interdendritical space in larger extent for CGDS samples.

Český abstrakt

In the present work two techniques are combined to optimise bond coat properties before TBC application, the cold gas dynamic spraying (CGDS) and electron beam remelting (EB). Results of the work focused on comparison of HVOF and CGDS CoNiCrAlY bond coats are firstly presented. Than the effect of the electron beam remelting of the CoNiCrAlY coating manufactured by HVOF and CGDS deposition techniques is deeply investigated. Scanning electron microscopy, light microscopy, and, in addition, X-Ray diffraction techniques were performed to characterize the phase modification and microstructure composition changes before and after the treatment. The microstructural and phase analyses have been supported by microhardness and nanohardness investigation and other necessary supporting techniques.

Anglický abstrakt

In the present work two techniques are combined to optimize bond coat properties before thermal barrier coating (TBC) application, the cold gas dynamic spraying (CGDS) and electron beam remelting (EB). Results of the work focused on comparison of high velocity oxygen fuel (HVOF) and CGDS CoNiCrAlY bond coats are firstly presented. Than the effect of the electron beam remelting of the CoNiCrAlY coating manufactured by HVOF and CGDS deposition techniques is deeply investigated. The CoNiCrAlY bond coat to Inconel substrate interface displayed locations with very poor bonding, in larger extent for the states prepared by HVOF comparing to CGDS. The bond coats prepared by both ways being EB remelted are typically removal of the defects on the substrate to bond coat interface. The microstructure of the bond coat after this treatment is formed by Inconel fine grain layer being followed by the surface layer consisting of elongated dendritic microstructure. An increased porosity has been observed in interdendritical space in larger extent for CGDS samples.

Klíčová slova česky

CoNiCrAlY, bond coat, thermal spray, electron beam remelting, thermal barrier coating

Klíčová slova anglicky

CoNiCrAlY, bond coat, thermal spray, electron beam remelting, thermal barrier coating

Vydáno

06.05.2016

Nakladatel

Elsevier

Místo

Amsterdam

ISSN

2211-8128

Ročník

12

Číslo

1

Strany od–do

89–94

Počet stran

6

BIBTEX


@article{BUT125982,
  author="Petra {Krajňáková} and Jan {Čížek} and Jan {Čupera} and Makoto {Hasegawa} and Ivo {Dlouhý},
  title="Microstructure modification of CGDS and HVOF sprayed CoNiCrAlY bond coat remelted by electron beam",
  year="2016",
  volume="12",
  number="1",
  month="May",
  pages="89--94",
  publisher="Elsevier",
  address="Amsterdam",
  issn="2211-8128"
}