Development of Low-Oxide MCrAlY Coatings for Gas Turbine Applications |
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Authors: | Bharat K Pant Vivek Arya B S Mann |
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Affiliation: | (1) Surface Coatings and Treatment, BHEL R&D, Vikasnagar, Hyderabad, India |
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Abstract: | Advanced high-energy plasma systems are being used to achieve the benefits of the high-velocity oxy-fuel (HVOF) system without
losing the inherent advantages of plasma for coating of gas turbine parts. MCrAlY coatings play a very important role in the
performance and reliability of gas turbine components. One of the important considerations for next generation of gas turbines,
which have more demanding conditions and need to withstand ever increasing operating temperatures, is that they should possess
very low oxygen content levels in the coating. Low oxygen content coatings are applied by the expensive low-pressure plasma
spray (LPPS)/vacuum plasma spray (VPS) technique for critical components in aero- and land-based gas turbines. This work deals
with the development of low-cost LPPS equivalent coatings (having low oxygen content) using the high-energy high-velocity
plasma spray (HEHVPS) gun and inert gas shroud. A comparison has also been made with CoNiCrAlY coatings by HVOF. |
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Keywords: | influence of spray parameters coatings for gas turbine components shrouded spraying microstructure of NiCrAlY TBC topcoats |
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