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Evaluation of thermal properties and life time of multilayered thermal barrier coating obtained from suspension plasma spray

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Author: 
Mujeebulla Khan Guttal and Abdul Sharief
Abstract: 

The aim of the study was to find the effect of thermal cyclic furnace (TCF) on thermal properties and life time of multilayered TBC obtained from new coating technology called suspension plasma spray (SPS). Porosity and Microstructure of multilayered TBCs before and after thermal aging were analyzed to understand the effect of sintering. Study uses single layer 7% YSZ and Lanthanum Zirconate (LZ) La2Zr2O7, double-layer LZ/YSZ TBC deposited with SPS. The overall coating thickness in all TBCs was kept the same. TBC systems were heat-treated in a normal electrically heated furnace at 1100 °C for 150 TCF cycles. Microstructure analyzed using scanning electron microscopy (SEM). Porosity measured using mercury intrusion method at 0, 50,100,150 TCF cycles. Thermal diffusivity, specific heat and thermal conductivity of both single and double layered TBCs analyzed using laser flash analyzer. Porosity has reduced due to sintering with increase in thermal conductivity in both single and double layered TBC. Life time of single and double layered TBC coated SPS has shown better life time. Tests revealed that the double layered SPS LZ/YSZ had improved thermal properties with better life time.

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