Detail publikace

Electron beam remelting of plasma sprayed alumina coatings

MATĚJÍČEK, J. VEVERKA, J. ČÍŽEK, J. KOUŘIL, J.

Anglický název

Electron beam remelting of plasma sprayed alumina coatings

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

en

Originální abstrakt

Plasma sprayed alumina coatings find numerous applications in various fields, where they enhance the properties of the base material. Examples include thermal barriers, wear resistance, electrical insulation, and diffusion and corrosion barriers. A typical structure of plasma sprayed coatings, containing a multitude of voids and imperfectly bonded interfaces, gives them unique properties – particularly low thermal conductivity, high strain tolerance, etc. However, for certain applications such as permeation barriers or wear resistance, these voids may be detrimental. This paper reports on the first experiments with remelting of plasma sprayed alumina coatings by electron beam technology, with the purpose of densifying the coatings and thereby eliminating the voids. Throughout the study, several parameters of the e-beam device were varied – beam current, traverse velocity and number of passes. The treated coatings were observed by light and electron microscopy and the thickness, structure and surface morphology of the remelted layer were determined and correlated with the process parameters. Based on the first series of experiments, the e-beam settings leading to dense and smooth remelted layer of sufficient thickness were obtained. In this layer, a change of phase composition and a marked increase in hardness were observed.

Anglický abstrakt

Plasma sprayed alumina coatings find numerous applications in various fields, where they enhance the properties of the base material. Examples include thermal barriers, wear resistance, electrical insulation, and diffusion and corrosion barriers. A typical structure of plasma sprayed coatings, containing a multitude of voids and imperfectly bonded interfaces, gives them unique properties – particularly low thermal conductivity, high strain tolerance, etc. However, for certain applications such as permeation barriers or wear resistance, these voids may be detrimental. This paper reports on the first experiments with remelting of plasma sprayed alumina coatings by electron beam technology, with the purpose of densifying the coatings and thereby eliminating the voids. Throughout the study, several parameters of the e-beam device were varied – beam current, traverse velocity and number of passes. The treated coatings were observed by light and electron microscopy and the thickness, structure and surface morphology of the remelted layer were determined and correlated with the process parameters. Based on the first series of experiments, the e-beam settings leading to dense and smooth remelted layer of sufficient thickness were obtained. In this layer, a change of phase composition and a marked increase in hardness were observed.

Klíčová slova anglicky

plasma sprayed coating; alumina; electron beam; remelting; post-treatment

Vydáno

01.05.2016

Nakladatel

Tanger Ltd.

Místo

Brno

ISBN

978-80-87294-66-6

Kniha

METAL 2016

Strany od–do

921–927

Počet stran

7

BIBTEX


@inproceedings{BUT127150,
  author="Matějíček {Jiří} and Jiří {Matějíček} and Jakub {Veverka} and Jan {Čížek} and Jan {Kouřil},
  title="Electron beam remelting of plasma sprayed alumina coatings",
  booktitle="METAL 2016",
  year="2016",
  month="May",
  pages="921--927",
  publisher="Tanger Ltd.",
  address="Brno",
  isbn="978-80-87294-66-6"
}