Control of bond coat microstructure in HVOF process for thermal barrier coatings

Sang Won Myoung, Zhe Lu, Yeon Gil Jung, Byung Koog Jang, Ungyu Paik

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The microstructure of bond coat was optimized by controlling coating parameters, such as spray distances, the gas flow ratio of air/oxygen/hydrogen, gun speed, and step distance, in high-velocity oxy-fuel process, and the effects of coating parameters on the microstructure and thermomechanical properties were investigated. When the spray distance to the substrate shortened, the microstructure became dense and the hardness values were increased. As the amount of hydrogen increased in the fixed gas flow ratio, defects such as global pores and oxides were increased and the hardness values were decreased, showing a similar trend in oxygen. The bond coat with the step distance of 8. mm showed a slightly higher hardness value than that with the step distance of 5. mm, indicating that the gun speed did not have much effect on the hardness value. However, in thermal diffusivity, the bond coat with the step distance of 5. mm showed lower values than that with the step distance of 8. mm. The optimum coating parameters could be proposed in HVOF process.

Original languageEnglish
Pages (from-to)63-67
Number of pages5
JournalSurface and Coatings Technology
Volume260
DOIs
Publication statusPublished - Dec 15 2014
Externally publishedYes

Fingerprint

Thermal barrier coatings
Hardness
coatings
microstructure
Microstructure
Coatings
hardness
Flow of gases
Hydrogen
Oxygen
Thermal diffusivity
gas flow
sprayers
Oxides
Defects
oxygen
hydrogen
thermal diffusivity
Substrates
Air

All Science Journal Classification (ASJC) codes

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

Cite this

Control of bond coat microstructure in HVOF process for thermal barrier coatings. / Myoung, Sang Won; Lu, Zhe; Jung, Yeon Gil; Jang, Byung Koog; Paik, Ungyu.

In: Surface and Coatings Technology, Vol. 260, 15.12.2014, p. 63-67.

Research output: Contribution to journalArticle

Myoung, Sang Won ; Lu, Zhe ; Jung, Yeon Gil ; Jang, Byung Koog ; Paik, Ungyu. / Control of bond coat microstructure in HVOF process for thermal barrier coatings. In: Surface and Coatings Technology. 2014 ; Vol. 260. pp. 63-67.
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