Novel HIPIMS deposited nanostructured CrN/NbN coatings for environmental protection of steam turbine components

HOVSEPIAN, Papken, EHIASARIAN, Arutiun, PURANDARE, Yashodhan, MAYR, Peter, ABSTOSS, Kevin, MOSQUERAFEIJOO, Maria, SCHULZ, Wencke, KRANZMANN, Axel, LASANTA, Maria and TRUJILLO, Javier (2018). Novel HIPIMS deposited nanostructured CrN/NbN coatings for environmental protection of steam turbine components. Journal of Alloys and Compounds, 746, 583-593.

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Official URL: https://www.sciencedirect.com/science/article/pii/...
Link to published version:: https://doi.org/10.1016/j.jallcom.2018.02.312

Abstract

To increase efficiency, modern steam plants are pushing their operational regime from super-critical (600°C/300 bar) to ultra- super-critical (740/760°C/350 bar) stretching existing turbine materials to their limits. The focus is on new generation functional materials and technologies which complement the inherent properties of existing materials. Current work proposes a novel High Power Impulse Magnetron Sputtering (HIPIMS) deposition technology, for the first time, for deposition of a ceramic based CrN/NbN coating with a nanoscale multilayer structure (bi-layer thickness ∆ = 1.9 nm) with superior adhesion ( LC2= 80N) to protect low Chromium P92 steel widely used in steam power plants. Thermodynamic calculations predict the equilibrium phases and aggressive gaseous compounds generated by the interaction of steam with the coating. CrN/NbN coated P92 steel samples oxidised at 600°C in a high pressure (50 bar) 100% steam atmosphere for up to 1000 h reveal the coating's superior oxidation resistance and protective mechanisms, especially against the detrimental effect of Hydrogen. High temperature (650°C) Tensile Strength, Low Cycle Fatigue and Creep tests confirm that, unlike other state-of-the-art PVD technologies, HIPIMS is not detrimental to the mechanical properties of the substrate material. Water droplet erosion tests confirm no measurable weight loss after 2.4x106 impacts.

Item Type: Article
Uncontrolled Keywords: hipims; CrN/NbN; nanoscale multilayers; steam oxidation resistance; water droplet erosion resistance.
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Departments: Faculty of Science, Technology and Arts > Engineering and Mathematics
Identification Number: https://doi.org/10.1016/j.jallcom.2018.02.312
Related URLs:
Depositing User: Yashodhan Purandare
Date Deposited: 07 Mar 2018 11:42
Last Modified: 21 Mar 2018 01:50
URI: http://shura.shu.ac.uk/id/eprint/18827

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