Journal
SURFACE & COATINGS TECHNOLOGY
Volume 251, Issue -, Pages 98-105Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.04.009
Keywords
Thermal barrier coatings (TBCs); Stress; Air plasma spray; Raman spectrascopy; Phase transformation
Funding
- Thousand Youth Talents Program
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [SHDP201303]
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The evolution of residual stresses in yttria stabilised zirconia (YSZ) thermal barrier coatings (TBCs) produced by air plasma-spray technique after thermal treatments at 1150 degrees C was investigated. The residual stresses in YSZ layer were measured using the Raman spectroscopy and curvature method, respectively. Generally, the YSZ layer was under compressive stress in as-deposited condition, but changed to tensile after thermal treatment for 30 hours partly due to the monoclinic to tetragonal phase transformation in YSZ layer. With prolonged thermal treatment, the residual stress gradually transformed from tensile to compressive, which can be attributed to the sintering in the YSZ layer. In addition, the beta-NiAl to gamma/gamma'-Ni3Al phase transformation in the bond coat also plays an important role on the stress in the YSZ layer. (C) 2014 Elsevier B.V. All rights reserved.
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