YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray

T. A. Owoseni; A. Rincon Romero; Z. Pala; F. Venturi; E. H. Lester; D. M. Grant; T. Hussain

doi:10.1016/j.ceramint.2021.05.087

YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray

T. A. Owoseni
, A. Rincon Romero
, Z. Pala
, F. Venturi
, E. H. Lester
, D. M. Grant
, T. Hussain^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension and solution precursor high-velocity oxy-fuel (HVOF) thermal spray. The relationships between processing, microstructure and final properties were studied through a range of characterization techniques and thermal cycling tests. The microstructure of the as-sprayed YAG topcoat from stoichiometric solution precursor (SP-YAG) had distributed pores and inter-splat boundaries, while the as-sprayed topcoat produced from suspension (S-YAG) had vertical and branched micro cracks, pores, and inter-splat boundaries. Both as-sprayed coatings were composed of amorphous phase, hexagonal yttrium aluminium perovskite (YAP) and cubic YAG. In thermal cycling tests, 20% of SP-YAG failure was reached after the 10th cycle; whereas, S-YAG reached the failure criteria between the 60th and 70th cycle. The failure of both the SP-YAG and the S-YAG topcoats occurred due to thermal stresses during the thermal cycling.

Original language	English
Pages (from-to)	23803-23813
Number of pages	11
Journal	Ceramics International
Volume	47
Issue number	17
DOIs	https://doi.org/10.1016/j.ceramint.2021.05.087
Publication status	Published - 1 Sept 2021
Externally published	Yes

Keywords

New generation-TBC
SHVOF
Single splat
YAG phase Transition

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10.1016/j.ceramint.2021.05.087

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title = "YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray",

abstract = "Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension and solution precursor high-velocity oxy-fuel (HVOF) thermal spray. The relationships between processing, microstructure and final properties were studied through a range of characterization techniques and thermal cycling tests. The microstructure of the as-sprayed YAG topcoat from stoichiometric solution precursor (SP-YAG) had distributed pores and inter-splat boundaries, while the as-sprayed topcoat produced from suspension (S-YAG) had vertical and branched micro cracks, pores, and inter-splat boundaries. Both as-sprayed coatings were composed of amorphous phase, hexagonal yttrium aluminium perovskite (YAP) and cubic YAG. In thermal cycling tests, 20\% of SP-YAG failure was reached after the 10th cycle; whereas, S-YAG reached the failure criteria between the 60th and 70th cycle. The failure of both the SP-YAG and the S-YAG topcoats occurred due to thermal stresses during the thermal cycling.",

keywords = "New generation-TBC, SHVOF, Single splat, YAG phase Transition",

author = "Owoseni, \{T. A.\} and \{Rincon Romero\}, A. and Z. Pala and F. Venturi and Lester, \{E. H.\} and Grant, \{D. M.\} and T. Hussain",

note = "Publisher Copyright: {\textcopyright} 2021 The Authors",

year = "2021",

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doi = "10.1016/j.ceramint.2021.05.087",

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T1 - YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray

AU - Owoseni, T. A.

AU - Rincon Romero, A.

AU - Pala, Z.

AU - Venturi, F.

AU - Lester, E. H.

AU - Grant, D. M.

AU - Hussain, T.

PY - 2021/9/1

Y1 - 2021/9/1

N2 - Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension and solution precursor high-velocity oxy-fuel (HVOF) thermal spray. The relationships between processing, microstructure and final properties were studied through a range of characterization techniques and thermal cycling tests. The microstructure of the as-sprayed YAG topcoat from stoichiometric solution precursor (SP-YAG) had distributed pores and inter-splat boundaries, while the as-sprayed topcoat produced from suspension (S-YAG) had vertical and branched micro cracks, pores, and inter-splat boundaries. Both as-sprayed coatings were composed of amorphous phase, hexagonal yttrium aluminium perovskite (YAP) and cubic YAG. In thermal cycling tests, 20% of SP-YAG failure was reached after the 10th cycle; whereas, S-YAG reached the failure criteria between the 60th and 70th cycle. The failure of both the SP-YAG and the S-YAG topcoats occurred due to thermal stresses during the thermal cycling.

AB - Yttrium aluminium garnet (YAG) is a promising topcoat material for thermal barrier coatings due to its high temperature stability and better CMAS (calcium-magnesium-alumino-silicate) resistance. YAG topcoats were deposited by suspension and solution precursor high-velocity oxy-fuel (HVOF) thermal spray. The relationships between processing, microstructure and final properties were studied through a range of characterization techniques and thermal cycling tests. The microstructure of the as-sprayed YAG topcoat from stoichiometric solution precursor (SP-YAG) had distributed pores and inter-splat boundaries, while the as-sprayed topcoat produced from suspension (S-YAG) had vertical and branched micro cracks, pores, and inter-splat boundaries. Both as-sprayed coatings were composed of amorphous phase, hexagonal yttrium aluminium perovskite (YAP) and cubic YAG. In thermal cycling tests, 20% of SP-YAG failure was reached after the 10th cycle; whereas, S-YAG reached the failure criteria between the 60th and 70th cycle. The failure of both the SP-YAG and the S-YAG topcoats occurred due to thermal stresses during the thermal cycling.

KW - New generation-TBC

KW - SHVOF

KW - Single splat

KW - YAG phase Transition

UR - https://www.scopus.com/pages/publications/85106491423

U2 - 10.1016/j.ceramint.2021.05.087

DO - 10.1016/j.ceramint.2021.05.087

M3 - Article

AN - SCOPUS:85106491423

SN - 0272-8842

VL - 47

SP - 23803

EP - 23813

JO - Ceramics International

JF - Ceramics International

IS - 17

ER -

YAG thermal barrier coatings deposited by suspension and solution precursor thermal spray

Abstract

Keywords

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