Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings

BRAUN, Reinhold, SCHULZ, Uwe, LEYENS, Christoph, HOVSEPIAN, Papken and EHIASARIAN, Arutiun (2010). Oxidation and fatigue behaviour of γ-TiAl coated with HIPIMS CrAlYN/CrN nanoscale multilayer coatings and EB-PVD thermal barrier coatings. International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde), 101 (5), 648-656.

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Link to published version:: 10.3139/146.110323

Abstract

CrAlYN/CrN nanoscale multilayer coatings were deposited on γ-TiAl substrate material using high power impulse magnetron sputtering technology. The nitride coating provided effective oxidation protection to γ-TiAl at 850°C for exposure time periods exceeding 2000 cycles of 1 h dwell time at high temperature in air. High oxidation resistance was also observed at 900°C. After exposure to air at 850°C for 300 h, coated tension specimens exhibited a reduction in fatigue strength of about 70 MPa compared to the bare γ-TiAl alloy. Zirconia topcoats produced by electron-beam physical vapour deposition were well adherent to the CrAlYN/CrN coating with an oxy-nitride overcoat. When thermally cycled at 900°C, the lifetime of this thermal barrier coating system on γ-TiAl exceeded 1000 1 h cycles. Below cracks in the nitride coating, the substrate was oxidised and protrusions of an outer oxide scale with columnar structure formed.

Item Type: Article
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Nanotechnology Centre for PVD Research
Identification Number: 10.3139/146.110323
Depositing User: Helen Garner
Date Deposited: 05 Jan 2012 16:10
Last Modified: 05 Jan 2012 16:10
URI: http://shura.shu.ac.uk/id/eprint/4257

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