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Zirconium cathodes with a nitrided surface layer are promising candidates for arc-heater tests in air because of their good erosion resistance and excellent physical properties. Nitriding of a zirconium cathode is performed by a microwave plasma generator. Nitrided cathodes yield a stable plasma flow of argon–air up to 80A at a maximum flow rate of 4l/min argon and 0.8l/min air for a long duration...
NiCoCrAlY has been used as the bond coat material in thermal barrier coating (TBC) to protect the superalloy substrate from oxidation and hot-corrosion. Inter-diffusion of elements between the coating and substrate could degrade the oxidation resistance of the coating and the mechanical properties of the superalloy. In this work, a gradient oxide dispersed (OD) NiCoCrAlY coating was produced onto...
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