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

Y. P. Purandare, A.P. Ehiasarian, M. M. Stack, P. Eh. Hovsepian

Research output: Contribution to journalArticle

26 Citations (Scopus)

Abstract

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.
LanguageEnglish
Pages1158-1162
Number of pages5
JournalSurface and Coatings Technology
Volume204
Issue number8
DOIs
Publication statusPublished - 15 Jan 2010

Fingerprint

Magnetron sputtering
erosion
impulses
Erosion
corrosion
magnetron sputtering
Corrosion
coatings
Coatings
Metal ions
metal ions
Physical vapor deposition
corrosion resistance
Defects
Corrosion resistance
defects
Deposits
Gases
deposits
Plasma diagnostics

Keywords

  • erosion-corrosion
  • erosion
  • corrosion
  • HIPIMS
  • surface coatings
  • mechanical engineering

Cite this

Purandare, Y. P. ; Ehiasarian, A.P. ; Stack, M. M. ; Hovsepian, P. Eh. / CrN/NbN coatings deposited by HIPIMS : a preliminary study of erosion-corrosion performance. In: Surface and Coatings Technology. 2010 ; Vol. 204, No. 8. pp. 1158-1162.
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abstract = "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.",
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CrN/NbN coatings deposited by HIPIMS : a preliminary study of erosion-corrosion performance. / Purandare, Y. P.; Ehiasarian, A.P.; Stack, M. M.; Hovsepian, P. Eh.

In: Surface and Coatings Technology, Vol. 204, No. 8, 15.01.2010, p. 1158-1162.

Research output: Contribution to journalArticle

TY - JOUR

T1 - CrN/NbN coatings deposited by HIPIMS

T2 - Surface and Coatings Technology

AU - Purandare, Y. P.

AU - Ehiasarian, A.P.

AU - Stack, M. M.

AU - Hovsepian, P. Eh.

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AB - 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.

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