The thermal fatigue behaviour of an air plasma sprayed thermal barrier coating wasinvestigated. And also the interfacial strengths of thermal barrier coated specimens subjected to thermal fatigue, as well as a retired TBC vane were also evaluated bymeans of an instrumented indentation machine. The results indicated that, (1) theTGO grew at the interface during thermal fatigue cycle as a function of the exposure time at elevated temperature; (2) the microcracks were initiated in the top coating and at the interface after thermal cycle tests; (3) the interfacial strength of TBC,which was evaluated by the indentation method, increased with the thermal cycles;(4) the interfaciai strength of the retired TBC vane was almost equal with that of theas-sprayed TBC specimen.
参考文献
| [1] | A K RAY;N ROY;K M GODIWALLA .Crack propagation studies and bond coat properties in thermal barrier coatings under bending[J].Bulletin of Materials Science,2001(2):203-209. |
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