The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings

Jine Sung Jung, Keun Bong Yoo, Eui Hyun Kim, Chae Hong Jeon, Do Hyang Kim

Research output: Contribution to journalArticle

Abstract

Rotating components used in the hot sections of land-based gas turbine are exposed to severe environment of several ten thousands operating hours above 1100°C, To protect such components against high temperature oxidation an intermediate bond coat is applied, typical of a MCrAlY-type metal alloy. Various processing methods have been studied for bond coat deposition. This study is concerned with the cyclic oxidation behavior of CoNiCrAlY coatings. Coatings were deposited by a vacuum plasma spray and high-velocity oxygen fuel method on a nickel-based superalloy (GTD-111). Cyclic thermal oxidation test condition is at 1100°C in ambient air for various periods of time. Tests were used to evaluate the oxidation resistance of the spray-coated specimens. The microstructure and morphology of as-sprayed and of tested specimens were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The oxide phases formed on the coating surface are NiO, CoCr2O 4, and Al2O3. The nickel oxide of them was to be dominant with increasing cycles. The differences in microstructure and phase composition in the interface with coating layer are reported. The influence of coating process methods on coating characteristics and degradation mechanisms is discussed. The HVOF coating with the splats was more resistant on the high temperature oxidation than the VPS coating.

Original languageEnglish
Pages (from-to)1141-1144
Number of pages4
JournalKey Engineering Materials
Volume326-328 II
Publication statusPublished - 2006 Dec 6

Fingerprint

Sprayed coatings
Coatings
Thermooxidation
Oxidation
Microstructure
Nickel oxide
Hot Temperature
Oxidation resistance
Nickel
Superalloys
Phase composition
Oxides
Gas turbines
Metals
Vacuum
Oxygen
Plasmas
X ray diffraction
Degradation
Scanning electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Jung, J. S., Yoo, K. B., Kim, E. H., Jeon, C. H., & Kim, D. H. (2006). The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings. Key Engineering Materials, 326-328 II, 1141-1144.
Jung, Jine Sung ; Yoo, Keun Bong ; Kim, Eui Hyun ; Jeon, Chae Hong ; Kim, Do Hyang. / The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings. In: Key Engineering Materials. 2006 ; Vol. 326-328 II. pp. 1141-1144.
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Jung, JS, Yoo, KB, Kim, EH, Jeon, CH & Kim, DH 2006, 'The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings', Key Engineering Materials, vol. 326-328 II, pp. 1141-1144.

The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings. / Jung, Jine Sung; Yoo, Keun Bong; Kim, Eui Hyun; Jeon, Chae Hong; Kim, Do Hyang.

In: Key Engineering Materials, Vol. 326-328 II, 06.12.2006, p. 1141-1144.

Research output: Contribution to journalArticle

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Jung JS, Yoo KB, Kim EH, Jeon CH, Kim DH. The thermal cyclic behavior of the VPS and HVOF-sprayed MCrAlY coatings. Key Engineering Materials. 2006 Dec 6;326-328 II:1141-1144.