Thermal shock performance of PS-PVD YSZ coating through water quenching cycle test

Conference Dates

June 24-29, 2018


PS-PVD technology has been considered as one of the competitors for conventional APS and EB-PVD thermal barrier coatings due to its flexibility in coating microstructure regulation, good coating thickness distribution for twin-vane and high coating deposition efficiency. However compared with typical columnar microstructure of EB-PVD YSZ, the PS-PVD YSZ coating has cauliflower-like microstructure which will result in distinct difference in coating performance. Thermal shock is one of the most significant factors for the durability of TBCs. Water quenching cycle test is an efficient and fast method to discriminate the thermal shock performance of TBCs. In this paper, 2 TBCs samples with a dimension of 25.4mm in diameter and 5mm in thickness were obtained with 100µm LPPS CoNiCrAlYTa as bond coat and PS-PVD YSZ coating (120 and 250µm) as top coat. The water quenching cycle test is as follows: coated sample was put into furnace at a temperature of 1100 oC, holding for 5min; then the sample was poured into deionized water at ambient temperature directly; photographing and recording the surface appearance; after drying the sample, then the test is cycled again.

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