Thermal barrier coatings are introduced for increasing durability of metallic components used in hot section of gas turbine engines. Current requirement of the gas turbine engine is to improve the fuel economy with superior efficiency has led to a continuous increase in gas inlet temperature. However, above 1200°C YSZ had issues like poor phase stability, high sintering rates etc. which affects the TBC life. Reason behind the using SPS process has modified property than APS i.e. ability of generating columnar microstructure. At high temperature sintering changes in TC layer may lead to reduction on porosity results change in mechanical properties and thermal properties.

This work presents sintering behaviour of suspension plasma sprayed single layered (8YSZ) TBC and multi-layered (GZ/8YSZ, 48YSZ/8YSZ, YAG/8YSZ) TBC´s at high the temperature, the influence of the substrate and changes in composition on sintering. Free standing TBC´s has positive effect on sintering as compared to TBC´s with the substrates.