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In order to extend the heat cyclic life of thermal barrier coating, the authors investigated introducing a protective compound of MoSi2 and NiCrAlY as an intermediate layer to a thermal barrier coating which conventionally consisted of a two-layer coating system to prevent the oxidation of the bond coating. The conventional two-layer coating system was delaminated after 20 thermal cycles. On the other hand, the three-layer coating system was not delaminated after 60 thermal cycles and its thermal cyclic properties were superior to those of the two-layer coating system. Because the MoSi2 introduced in the intermediate layer of the three-layer coating system has a self-repair property in which cracks and voids are sealed by the formation of an SiO2 layer, excellent thermal cyclic properties were obtained by preventing formation of thermally grown oxides due to the separation of coating.

Thermal Cyclic Properties of Thermal Barrier Coating with MoSi2 Intermediate Layer