Inelastic deformation of free-standing plasma-sprayed thermal barrier coatings

X. H. Wu; M. Arai; K. Fujimoto; Q. Sun

doi:10.1117/12.839349

25 August 2009 Inelastic deformation of free-standing plasma-sprayed thermal barrier coatings

X. H. Wu, M. Arai, K. Fujimoto, Q. Sun

Proceedings Volume 7375, ICEM 2008: International Conference on Experimental Mechanics 2008; 73755M (2009) https://doi.org/10.1117/12.839349
Event: International Conference on Experimental Mechanics 2008 and Seventh Asian Conference on Experimental Mechanics, 2008, Nanjing, China

Abstract

A fundamental study for an inelastic deformation of freestanding plasma-sprayed thermal barrier coatings (TBCs) has been conducted. Cantilever-type bending tests are carried out to obtain stress-strain curve of the coating extracted from TBC coated sample by an electrochemical treatment. In order to investigate about an inelastic deformation and its mechanism appeared in the freestanding ceramic coating, in-situ scanning electron microscope (SEM) observation is performed by means of a small tensile testing device that can insert into SEM vacuum chamber. The bending test result indicated that the coating deforms with nonlinear under a monotonic loading and with hysteresis loop under cyclic loading, in spite of ceramic material. In-flight particle velocity in the spraying parameter affected significantly the stressstrain curve. In-situ SEM observation during the bending test revealed that sliding at boundary between splats plays an important role in inelastic deformation.

Citation Download Citation

X. H. Wu, M. Arai, K. Fujimoto, and Q. Sun "Inelastic deformation of free-standing plasma-sprayed thermal barrier coatings", Proc. SPIE 7375, ICEM 2008: International Conference on Experimental Mechanics 2008, 73755M (25 August 2009); https://doi.org/10.1117/12.839349

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