Characterization of the thermal conductivity of EB-PVD ZrO 2-Y 2O 3 coatings with a pulsed thermal imaging method

Byungkoog Jang, J. G. Sun, S. W. Kim, Y. S. Oh, H. T. Kim

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

ZrO 2-(2-8mol%)Y 2O 3 coatings were deposited on zirconia substrates by EB-PVD. The coated layer had a columnar microstructure with intercolumnar gaps between columnar grains. Nanosized pores could be observed around feather-like grains as well as inside the columnar grains. The main phase of all coated specimens was the tetragonal phase. However, the monoclinic and cubic phase of the second phase could be detected for ZrO 2-2mol%Y 2O 3 coatings and ZrO 2-(6-8mol%)Y 2O 3 coatings, respectively. The thermal conductivity of coatings was successfully evaluated with the pulsed thermal imaging method using a combined sample of coatings and a substrate. Both the thermal conductivity and heat capacity of Y 2O 3-doped ZrO 2 coatings tended to decrease with increasing amounts of Y 2O 3.

Original languageEnglish
Pages (from-to)177-181
Number of pages5
JournalSurface and Coatings Technology
Volume207
DOIs
Publication statusPublished - Aug 25 2012
Externally publishedYes

Fingerprint

Infrared imaging
Physical vapor deposition
Thermal conductivity
thermal conductivity
coatings
Coatings
Substrates
zirconium oxides
Zirconia
Specific heat
specific heat
porosity
microstructure
Microstructure

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Characterization of the thermal conductivity of EB-PVD ZrO 2-Y 2O 3 coatings with a pulsed thermal imaging method. / Jang, Byungkoog; Sun, J. G.; Kim, S. W.; Oh, Y. S.; Kim, H. T.

In: Surface and Coatings Technology, Vol. 207, 25.08.2012, p. 177-181.

Research output: Contribution to journalArticle

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AU - Kim, H. T.

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AB - ZrO 2-(2-8mol%)Y 2O 3 coatings were deposited on zirconia substrates by EB-PVD. The coated layer had a columnar microstructure with intercolumnar gaps between columnar grains. Nanosized pores could be observed around feather-like grains as well as inside the columnar grains. The main phase of all coated specimens was the tetragonal phase. However, the monoclinic and cubic phase of the second phase could be detected for ZrO 2-2mol%Y 2O 3 coatings and ZrO 2-(6-8mol%)Y 2O 3 coatings, respectively. The thermal conductivity of coatings was successfully evaluated with the pulsed thermal imaging method using a combined sample of coatings and a substrate. Both the thermal conductivity and heat capacity of Y 2O 3-doped ZrO 2 coatings tended to decrease with increasing amounts of Y 2O 3.

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