Abstract No.:
4657

 Scheduled at:
Wednesday, May 11, 2016, Yellow River Hall 3:40 PM
Aviation Industry III


 Title:
Influence of microstructure on thermo-cyclic fatigue and thermal shock resistance of axial suspension plasma sprayed thermal barrier coatings

 Authors:
Ashish Ganvir* / University West, Sweden
Nicolaie Markocsan / University West , Sweden
Zdenek Pala/ Institute of Plasma Physics, Czech Republic

 Abstract:
Suspension Plasma Spraying is a relatively new thermal spaying technique to produce advanced thermal barrier coatings. This technique enables the production of a variety of structures from highly dense, highly porous, segmented or columnar coatings. In an earlier work it was shown that there is a significant influence of the different microstructural features on thermal properties of TBCs. However, no functional performance was tested which is the requirement for gas turbines.
In this work a comparative study is performed on five different suspension plasma sprayed coatings which were produced using axial injection and different process parameters. The influence of coating microstructure on thermo-cyclic fatigue and thermal shock resistance was of specific interest. Tests carried out include microstructural analysis with SEM, phase analysis using X-ray Diffraction, porosity analysis using Archimedes experimental setup and image analysis, thermal conductivity measurements using laser flash analysis, lifetime analysis using thermo-cyclic fatigue testing and thermal shock resistance using burner rig test.
The results showed that various types of microstructures produced in this work such as columnar, feathery/porous columnar or dense cracked columnar have significant influence on thermo-cyclic fatigue lifetime and thermal shock resistance. High performance coating with feathery/porous columnar structure was produced using relatively low feed rates and higher spray distances.


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