单面沉积热障涂层失效模式的研究
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326% 923% wafa.!k%~~%$~ Vo1.26 No.3 2006 % 6 -- Journal of Chinese Society for Corrosion and Protection Jun. 2006
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1 EjE (Thermal Barrier Coatings)
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-
embedded ox~de Ni I Co rich TGO from
embedded oxides
Internal ox~dat~on Fig. 1 Schematic illustrations showing the progresive microstructural evolution and damage accumulation during cyclic oxidation lead-
ing to the spallation failure of TBC: (a) as- coated, (b) damage at YSZ/TGC) interface due to rumpling, and formation of Ni/ Co rich TO due to embedded oxide, (c) formation of voids and internal oxidation and (d) final
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Fig. 2 SEM image for the cross - section in one side coated TBC
after 700 cycles
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%E~!J~I%~!J~~~EE+TZ~%EPJ?$. Fig.3 SEM ohservarion for spalling surface of the sample after 700 thermal cycles at 1050°C and elements d~stribution
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Fig.4 Details of the sample dimensions (in mm) and schematic
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Fig. 5 Phase angle plot from ~mpedaricr rnea>urement at 800°C of &%-h~imwk%m~%$;
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n >270 El$, 0-logf
TRCA sample for d~fferent perlods
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Fig.6 Equivalent circuits models of sample oxidized for (a) less
than 260 cycles and (b, c) for more than 270 cycles
Table 1 Resistance values and characteristic frequency for different equivalent circuit element in Fig. 6 thermal cycles/n 10 4 0