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Vol.33, No.5, 671 ~ 677, 1995

Title

Thermal - Fatigue Failure Behavior of MCrAlY / ZrO2 - 8wt%Y2O3 Thermal Barrier Coating and Effects of the Laser Treatment

진만복Man Bok Jin, 이선호Seon Ho Lee, 김종영Chong Young Kim, 강춘식Choon Sik Kang

Abstract

Isothermal and thermal fatigue tests were carried out for plasma sprayed and laser treated MCrAly/ZrO₂ 8wt%Y₂O₃ thermal barrier coatings(TBCs) to discuss the failure mechanism and the effects of laser-treatment. Phase transformation of the ceramic coating was not occurred during testing. In thermal fatigue test, at the temperature range of 1100℃∼RT, specimens were investigated prior to and after failure. Cracks initiated, grew and combined by stresses due to thermal expansion mismatch and oxidation of the bond coating near the bond/ceramic coating interface. So, failure of the TBC without laser-treatment occurred suddenly. In case of laser-treated TBCs, vertical cracks arisen from laser-treatment and cracks which initiated and grew near the interface-combined. But failure of the laser-treated TBC occurred gradually. Thermal fatigue Iife of the laser-treated TBC was increased 1.7 times than the TBC without laser-treatment.

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