DEVELOPMENT OF PROTECTIVE COATINGS FOR SINGLE CRYSTAL TURBINE BLADES

Rai, Amarendra K.

UES, Inc.

关键词: Corrosion;    Aluminium;    Thermal Barriers;    Protective Coatings, Thermal Barrier Coatings, Oxidation, Corrosion, Turbine Blade, Cathodic Arc, Pvd;    36 Materials Science;   

DOI  :  10.2172/895828
RP-ID  :  DOE/ER83809-1
RP-ID  :  FG02-03ER83809
RP-ID  :  895828

美国|英语

来源: UNT Digital Library

【 摘 要 】

Turbine blades in coal derived syngas systems are subject to oxidation and corrosion due to high steam temperature and pressure. Thermal barrier coatings (TBCs) are developed to address these problems. The emphasis is on prime-reliant design and a better coating architecture, having high temperature and corrosion resistance properties for turbine blades. In Phase I, UES Inc. proposed to develop, characterize and optimize a prime reliant TBC system, having smooth and defect-free NiCoCrAlY bond layer and a defect free oxide sublayer, using a filtered arc technology. Phase I work demonstrated the deposition of highly dense, smooth and defect free NiCoCrAlY bond coat on a single crystal CMSX-4 substrate and the deposition of alpha-alumina and yttrium aluminum garnet (YAG) sublayer on top of the bond coat. Isothermal and cyclic oxidation test and pre- and post-characterization of these layers, in Phase I work, (with and without top TBC layer of commercial EB PVD YSZ) revealed significant performance enhancement.