TITLE:
Effects of Layer Thickness and Edge Conditions to Thermoelastic Characteristics on Thermal Barrier Coatings
AUTHORS:
Jaegwi Go, Je-Hyun Lee
KEYWORDS:
Thermal Barrier Coatings, Air Plasma Spray, Layer Thickness, Thermoelastic Characteristics, Finite Volume Method
JOURNAL NAME:
Applied Mathematics,
Vol.5 No.16,
August
29,
2014
ABSTRACT: The
thermoelastic behaviors of such as temperature distribution,
displacements, and stresses in thermal barrier coatings (TBC) are seriously
influenced by top coat thickness and edge conditions. The top coat of TBC specimens prepared with TriplexPro?-200 system was controlled by changing the
processing parameter and feedstock, showing the various thicknesses and
microstructures. A couple of governing partial differential equations were
derived based on the thermoelastic theory. Since the governing equations were
too involved to solve analytically, a finite volume method was developed to
obtain approximations. The thermoelastic behaviors of TBC specimens with the various
thicknesses and microstructures were estimated through mathematical approaches
with different edge conditions. The results demonstrated that the
microstructure and thickness of the top coat, and the edge condition in
theoretical analysis were crucial factors to be considered in controlling the
thermoelastic characteristics of plasma-sprayed TBCs.