DEGRADATION OF A THERMAL BARRIER COATING DUE TO HOT CORROSION

J Chin Soc Corr Pro

1997, Vol. 17

Issue (2): 147-151 DOI:

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DEGRADATION OF A THERMAL BARRIER COATING DUE TO HOT CORROSION

FAN Ruilin (Beijing Institute of Aeronautical Materials)

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Abstract Degradation of a thermal barrier coating (TBC), consisting of NiCrAlY as bottom layer and ZrO2·8%Y2O3 as top layer, on superalloy K3 under hot corrosion condition was studied. The coating was obtained successively by DC magnetron sputtering and RF magnetron sputtering. SEM metallography and XRD were used to examine the change of the morphology of coating surface, coating/ substrate interface and corrosion products. The ceramic top layer in TBC considerably improved its hot corrosion resistance. There were two reasons to cause degradation of TBC. First, the fused salt penetrated along grain boundaries of the ceramic top layer and attacked its bottom layer. Second, acid dissolution of Y2O3 promoted transformation of ZrO2 from cubic (C) phase to monoclinic (M) phase. Some technical faults might lead to premature catastrophic failure of TBC.

Key words: Thermal barrier Coating Hot corrosion

Received: 25 April 1997

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FAN Ruilin (Beijing Institute of Aeronautical Materials). DEGRADATION OF A THERMAL BARRIER COATING DUE TO HOT CORROSION. J Chin Soc Corr Pro, 1997, 17(2): 147-151.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I2/147

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