Yashodhan Purandare

Dr. Yashodhan Purandare

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Research Focus & Metrics

Academic Career Length

23Years (2004-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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20 February 2008 in Journal of Vacuum Science & Technology A
Verified
Journal Article
Closed access
YPYashodhan Purandare
Yashodhan Purandare
AEArutiun Ehiasarian
Arutiun Ehiasarian
Papken HovsepianPapken Hovsepian
Papken Hovsepian
Nanoscale multilayer CrN/NbN physical vapor deposition (PVD) coatings are gaining reputation for their high corrosion and wear resistance. However, the CrN/NbN films deposited by ABS™ (arc bond sputtering) technology have some limitations such as macrodroplets, porosity, and less dense structures. The novel HIPIMS (high power impulse magnetron sputtering) technique produces macroparticle-free, highly ionized metal plasma, which brings advantages in both surface pretreatment and coating deposition stages of the PVD process. In this study, nanoscale multilayer CrN/NbN PVD coatings were pretreated and deposited with HIPIMS technology and compared with those deposited by HIPIMS-UBM (unbalanced magnetron) and by the ABS™ technique. In all cases Cr+ etching was utilized to enhance adhesion by low energy ion implantation. The coatings were deposited at 400 °C with substrate biased (Ub) at −75 V. During coating deposition, HIPIMS produced significantly high activation of nitrogen compared to the UBM as observed with mass spectroscopy. HIPIMS-deposited coatings revealed a bilayer period of 4.1 nm (total thickness: 2.9 μm) and hardness of 3025 HK0.025. TEM results revealed droplet free, denser microstructure with (200) preferred orientation for the HIPIMS coating owing to the increased ionization as compared to the more porous structure with random orientation observed in UBM coating. The dry sliding wear coefficient (Kc) of the coating was 1.8×10−15 m3 N−1 m−1, whereas the steady state coefficient of friction was 0.32. Potentiodynamic polarization tests revealed higher Ecorr values, higher pitting resistance (around potentials +400 to +600 mV), and lower corrosion current densities for HIPIMS deposited coatings as compared to the coatings deposited by ABS or HIPIMS-UBM. The corrosion behavior of the coatings qualitatively improved with the progressive use of HIPIMS from pretreatment stage to the coating deposition step.

1 January 2011 in Surface and Coatings Technology
Verified
Journal Article
Closed access
GKG. Kamath
G. Kamath
AEArutiun Ehiasarian
Arutiun Ehiasarian
YPYashodhan Purandare
Yashodhan Purandare
Papken HovsepianPapken Hovsepian
Papken Hovsepian

1 June 2018 in Surface and Coatings Technology
Verified
Journal Article
Closed access
BBBarnali Biswas
Barnali Biswas
YPYashodhan Purandare
Yashodhan Purandare
IKImran Khan
Imran Khan
Papken HovsepianPapken Hovsepian
Papken Hovsepian

1 July 2014 in Thin Solid Films
Verified
Journal Article
Closed access
Papken HovsepianPapken Hovsepian
Papken Hovsepian
ASArunprabhu Arunachalam Sugumaran
Arunprabhu Arunachalam Sugumaran
YPYashodhan Purandare
Yashodhan Purandare
DLDaniel A.L. Loch
Daniel A.L. Loch
AEArutiun Ehiasarian
Arutiun Ehiasarian

1 September 2006 in Surface and Coatings Technology
Verified
Journal Article
Closed access
YPYashodhan Purandare
Yashodhan Purandare
Margaret StackMargaret Stack
Margaret Stack
Papken HovsepianPapken Hovsepian
Papken Hovsepian

1 August 2016 in Materials Chemistry and Physics
Verified
Journal Article
Closed access
Papken HovsepianPapken Hovsepian
Papken Hovsepian
AEArutiun Ehiasarian
Arutiun Ehiasarian
YPYashodhan Purandare
Yashodhan Purandare
BBB. Biswas
B. Biswas
FTFrancisco Javier Perez Trujillo
Francisco Javier Perez Trujillo
AAAlina Agüero
Alina Agüero