Abstract
Nickel based superalloys are widely used in production of turbine blades. Although these materials have acceptable mechanical properties at high temperatures, they do can operate upto 700–800 °C but corrode and oxidise at temperatures above this. Generally, thermal barrier coating is used to safeguard the turbine blades at high temperatures. Commonly Yttria stabilized Zirconia TBC System is employed. This thermal barrier coating provides a great thermal and oxidation protection upto 1200 °C and fails above this temperature. In order to increase the oxidation resistance of nickel base superalloy, gadolinium oxide doped yttria stabilized zirconia coating mixed in varying percentages is applied on the surface of superalloy by air plasma spray coating process. The salt spray corrosion test is carried out to analyse the corrosion behaviour of all the TBC compositions to be studied.
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