Effects of heat treatment on microstructures and physical properties of segmented thermal barrier coatings

Hongbo Guo, Hideyuki Murakami, Seiji Kuroda

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Highly segmented thermal barrier coatings (TBCs) were produced by "hot" plasma spraying. The effects of heat treatment on the microstructures, mechanical and thermophysical properties were studied. The segmented coatings are denser than traditionally plasma-sprayed TBCs due to its good insplat bonding at high substrate temperature. The segmentation cracks and associating branching cracks hardly propagated or closed during sintering process, indicative of a good stability of crack network. Due to its low porosity, the segmented coatings compromised the property of thermal insulation of TBCs. For the coatings after 24 h heat treatment at 1523 K, the thermal conductivity was improved by around 35%. The segmentation cracks had a strong impact on decreasing the Young's modulus. Heat treatment could not effectively promote the increase of the Young's modulus, especially for the case of highly segmented coatings.

Original languageEnglish
Pages (from-to)1775-1778
Number of pages4
JournalMaterials Transactions
Volume46
Issue number8
DOIs
Publication statusPublished - 2005 Aug 1
Externally publishedYes

Fingerprint

Thermal barrier coatings
heat treatment
Physical properties
physical properties
Heat treatment
Cracks
coatings
Coatings
microstructure
Microstructure
cracks
Elastic moduli
Plasma spraying
Sprayed coatings
Thermal insulation
modulus of elasticity
Thermal conductivity
Sintering
Thermodynamic properties
Porosity

Keywords

  • Microstructure
  • Plasma spraying
  • Segmentation cracks
  • Sintering
  • Thermal barrier coatings
  • Thermal conductivity
  • Young's modulus

ASJC Scopus subject areas

  • Materials Science(all)
  • Metals and Alloys

Cite this

Effects of heat treatment on microstructures and physical properties of segmented thermal barrier coatings. / Guo, Hongbo; Murakami, Hideyuki; Kuroda, Seiji.

In: Materials Transactions, Vol. 46, No. 8, 01.08.2005, p. 1775-1778.

Research output: Contribution to journalArticle

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