Abstract
Thermal cycle tests of thermal barrier coated type 304 stainless steel were conducted. 8 mass% Y2O3-ZrO2, Al2O3, CoNiCrAlY, NiCr coatings were used for the thermal barrier coatings (TBCs). Surface strain behavior during the thermal cycle test was measured using the laser speckle strain! displacement gauge (SSDG) in order to examine the delamination damage process. Surface strain was found to decrease when interface delamination occurred. Fatigue processes were discussed with the results of both surface strain measurement and microscopic observation of the specimen. Cracking occurred in ceramics layer and the crack grew parallel to the interface between the ceramics layer and the bond coating layer in the ceramics layer near the interface. The number of cycles to delamination decreased with increasing of the maximum temperature and hold time at its temperature. LPPS bond coating was found to be effective in extending the thermal cycle fatigue life of thermal barrier coated material.
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