Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging

Xun Zhang, Xiao Shan, Philip Withers, Xiaofeng Zhao, Ping Xiao

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Abstract

The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250°C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.
Original languageEnglish
Pages (from-to)94-98
Number of pages5
JournalScripta Materialia
Volume176
Early online date10 Oct 2019
DOIs
Publication statusPublished - 1 Feb 2020

Keywords

  • Aero engine
  • Correlative microscopy
  • Failure
  • High temperature
  • Volcanic ash

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