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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%&R%#FatBURk+ZB,Z 21-02 H@gE(~it-

tria Stabilized Zirconia,

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%R$.~~:&EE(TGO)[~], gE%%&#i%. E%U%, ~IT%~%%@%EIYJJE@S@,%T %@%E%$*g3%%?*$hEmRR--ZE%@% ER%~~$~+&~%F~.VXctQ~%%B%*B~~~

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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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%, 2;%xEl3, IEI +Be!88i5fi@ YSZ, %&b!J3!if@ &T%@%S?Z+%k+&b!J N2Q. bF@EE3'J zGmsmmiEE&i5fiIJ!J%% YSZ, TL4%@, %B

%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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of deforming state dlagram in the thermal cyclic process ?2g-%G@%%!&, k$EE?%%

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Fig. 5 Phase angle plot from ~mpedaricr rnea>urement at 800°C of &%-h~imwk%m~%$;

3

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