By Dongming Zhu, Hua-Tay Lin, Sanjay Mathur, Tatsuki Ohji
The current quantity includes 16 contributed papers from the symposium, with issues together with complicated 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 numerous severe engineering purposes.
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Extra info for Advanced Ceramic Coatings and Interfaces V: Ceramic Engineering and Science Proceedings, Volume 31
There is experimental evidence for the ratcheting mechanism21 although the incidence of failure by this route does not seem widespread. e. roughening, of the TGO/bond-coat interface has been observed under thermal cycling but only in the absence of the ceramic top coat and does not seem to occur in standard TBC systems. The difficulty with both these mechanisms is the mechanical constraint imposed by the YSZ top coat. For the rumpling process, for example, it is necessary for the bond coat to be sufficiently weak to allow relatively large-scale deformation but it must also be strong enough to induce similar local displacement within the top coat.
48,2593, (2000). 26. K. R. , 48,3283, (2000). 27. K. R. , 52,5129, (2004). 28. P. Busso, L. E. N. RJ. Saunders, S. Osgerby and J. , 55, 1491, (2007). 29. M. S. H. Meier, Metall. Mater. , 37A, 1563, (2006). 30. E. T. Donaldson and T. C. Gilmour, Ox. , 52, 317, (1999). 31. G. Strehl, D. Naumenko, H. 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.
The strain energy, Gysz, is given similarly as: G ysz = E y s z l 1 _ v y s z j ( , T - T d e p r lasub _a yszj h ysz (8) The parameters are as in equation (7) but now refer to the YSZ layer; Tjep is the temperature at which the top coat was deposited in an assumed stress-free condition. Evaluation of G'M can now be readily made using the values given in Table 1 together with T0X=1373K, Tdep=1273K and T=373K. m"2. In principle, the quantity, Gy5Z is available to produce decohesion at the top-coat/TGO interface and GtM at the TGO/bond-coat interface and conceivably also for fracture within the TGO layer.
Advanced Ceramic Coatings and Interfaces V: Ceramic Engineering and Science Proceedings, Volume 31 by Dongming Zhu, Hua-Tay Lin, Sanjay Mathur, Tatsuki Ohji