Acta Metallurgica Sinica (English Letters) ›› 1996, Vol. 9 ›› Issue (6): 519-522.

• Research paper • Previous Articles     Next Articles

INVESTIGATIONS ON THE FORMATION OF INITIAL CRACKS IN THERMAL BARRIER COATINGS PREPARED BY EB-PVD

S.K.Gong;L. Deng;F.S.Liu and H.B.Xu(Department of Material Science and Engineering,Beijing University of Aeronautics and Astronautics,Beijing 100083,China Manuscript received 26 August 1996)   

  • Received:1996-12-25 Revised:1996-12-25 Online:1996-12-25 Published:2009-10-10

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Abstract: This paper deals with the mechanism of the formation of initial cracks in the yttria partially stabilized zirconia thermal barrier coatings prepared by EB-PVD method.The microcracks were only recognized inside the ceramic top coat of the thermalcycled TBCs. SEM/EDS observations indicated that some special oxides exist in the area just below the cracks.It seems that the formation of the initial cracks can result from the oxidation stress as well as the thermal stress.

Key words: TBCs, EB-PVD, thermocycle, initial cracks

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