By Dongming Zhu, Hua-Tay Lin, Sanjay Mathur, Tatsuki Ohji
The current quantity includes 16 contributed papers from the symposium, with issues together with complex coating processing, complex coating for put on, corrosion, and oxidation resistance, and thermal and mechanical homes, highlighting the cutting-edge ceramic coatings applied sciences for varied severe engineering functions.
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Extra resources for Advanced Ceramic Coatings and Interfaces V: Ceramic Engineering and Science Proceedings, Volume 31
Predicted out-of-plane stresses at 25°C for two roughness levels after 100 hours at 1100°C. This combination of out-of-plane tensile stresses developed at the oxidation temperature along asperity flanks and those produced in the valley regions during cooling is particularly onerous. For rough regions of bond coats it provides the opportunity for flank cracks to form at the oxidation temperature (or lower) and to propagate across the valley regions during cooling. Examples of this type of cracking are shown in Figure 7 for an EBPVD-YSZ/Pt-aluminide TBC system after 2 hours exposure at 1200°C.
The situation is exacerbated should fast-growing, non-protective oxides form locally as a result of localised aluminium depletion within the bond coat. These aspects will be considered in this paper as well as the influence of thermal strains produced during temperature changes. Initially, though, consideration will be given to the inherently mechanically unstable nature of a TBC system. e. W*h = G = G r (1) W* is the strain energy per unit volume of the oxide layer which, in the absence of mechanically imposed stresses, is the sum of the strain energy associated with oxide growth stresses and that due to differential strains during temperature changes9: W* : "σε+Εοχ(ΔΤ)(Δα))2(1-νοχ) (2) where a g is the growth stress within the oxide layer, E<,x is the Young's modulus of the oxide layer, vox its Poisson's ratio, ΔΤ the temperature change and Δα = (ctm-aox) is the difference in linear expansion coefficients between metal and oxide.
M. Rodrigeuz Lobo, G. J. J. Quadakkers, Mater. , 17, 87, (2000). 32. P. B. E. Evans, Ox. , 53,241, (2000). 33. P. M. E. Evans, Mater. , 59,508, (2008). 34. C-H. A. J. F. K. R. A. C. R. Cannon, J. Amer. Ceram. , 82,1073 (1999). 35. P. E. Q. P. , 58, 1242, (2010). Advanced Ceramic Coatings and Interfaces V · 55 Advanced Ceramic Coatings and Interfaces V Edited by Dongming Zhu and Hua-Tay Lin Copyright © 2010 The American Ceramic Society STRENGTH DEGRADING MECHANISMS IN PLASMA SPRAY COATED SILICON NITRIDE Ramakrishna T.