The service life of thermal barrier coating (TBC) is determined by its mechanical properties like Young’s modulus and toughness and high temperature oxidation resistance (under both isothermal and cyclic conditions). Usually, Yttria stabilized Zirconia (YSZ) top coating followed by a MCrAlY bond coat is conventionally used as the thermal barrier coating. Alumina is also a promising diffusion barrier coating which has improved performance against high temperature oxidation and hot corrosion. However, large probability to sintering, high Young’s modulus and low coefficient of thermal expansion are the drawbacks associated with application of alumina as the thermal barrier coating. The present study concerns development of a compositionally graded CoNiCrAlY/Al2O3/YSZ thermal barrier coating by thermal spray deposition route and a detailed investigation of mechanical (Young’s modulus, hardness and fracture toughness) and high temperature oxidation resistance properties (under both isothermal and cyclic conditions) of the compositionally graded TBC and its comparison with conventional CoNiCrAlY/YSZ duplex TBC. The properties achieved in the graded coating have been analyzed compared with the duplex coating.
|Number of pages
|Published - 2014
|6th Asian Thermal Spray Conference - Hotel Novotel, Hyderabad, India
Duration: 24 Nov 2014 → 26 Nov 2014
Conference number: 6
|6th Asian Thermal Spray Conference
|24/11/14 → 26/11/14