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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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CrN/NbN coatings deposited by HIPIMS : A preliminary study of erosion-corrosion performance

Purandare, Yashodhan and Ehiasarian, A.P. and Stack, Margaret and Hovsepian, P. (2010) CrN/NbN coatings deposited by HIPIMS : A preliminary study of erosion-corrosion performance. Surface and Coatings Technology, 204 (8). pp. 1158-1162. ISSN 0257-8972

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Nanoscale CrN/NbN multilayer PVD coatings have exhibited resistance to erosion-corrosion. However, growth defects (under dense structures and droplets) in the coating produced by some deposition technologies reduce the ability to offer combined erosion-corrosion resistance. In this work a novel High Power Impulse Magnetron Sputtering (HIPIMS) technique has been utilised to pretreat substrates and deposit dense nanoscale CrN/NbN PVD coatings (HIPIMS-HIPIMS technique). This new technique, rich with metal ion plasma, deposits very dense structures and offers virtually defect free coatings (free of droplets as observed in cathodic arc technique and under-dense structures observed in standard dc sputtering). Plasma diagnostic studies revealed a high metal ion-to-gas ion ratio (Cr:Ar) of 3:1 for HIPIMS pretreatment conditions with the detection of 14% Cr**2+ and 1% Cr**3+ and J..S of 155 mAcm**-2. For deposition conditions the metal ion-to-gas ratio was approximately 1:4 which is significantly higher compared to DC at 1:30. Characterisation results revealed a high adhesion of L..C 80 N, high hardness of 34 GPa and Young's modulus of 381 GPa. Low friction coefficient (0.46) and dry sliding wear coefficient, K..C (1.22 X 10**-15 M**3 nM**-1) were recorded. The effect of deposition technique (droplet defect and intergranular void free coatings) on erosion-corrosion resistance of CrN/NbN coatings has been evaluated by subjecting the coatings to a slurry impingement (Na..2 CO..3 + NaHCO..3 buffer solution with Al..2 O..3 particles of size 500-700 µm) at 90° impact angle with a velocity of 4 ms**-1. Experiments have been carried out at -1000 mV, +300 mV and +700 mV representing 3 different corrosion conditions.