Performance evaluation of TiAlCrYN nanocomposite coatings deposited using four-cathode reactive unbalanced pulsed direct current magnetron sputtering system

Barshilia, Harish C and Shashidhara, Acharya and Moumita, Ghosh and Suresh, T.N. and Rajam, KS and Konchady, Manohar and Pai, Devdas and Sankar, Jagannathan (2010) Performance evaluation of TiAlCrYN nanocomposite coatings deposited using four-cathode reactive unbalanced pulsed direct current magnetron sputtering system. Vacuum, 85 . pp. 411-420. ISSN 0042-207X

Full text available as:
[img] PDF (Journal) - Published Version
Restricted to Registered users only

Download (2082Kb) | Request a copy

    Abstract

    Approximately 1.5e2.5 mm thick nanocomposite coatings of TiAlCrYN were deposited using a fourcathode reactive unbalanced pulsed direct current magnetron sputtering system from the sputtering of Ti, Al, Cr, and Y targets in Ar þ N2 plasma. The TiAlCrYN nanocomposite coatings were deposited on various substrates such as high speed steel (HSS) drill bits, mild steel and silicon. TiAlCrYN coatings with almost similar mechanical properties but with different Ti, Al, Cr and Y contents were prepared to study their thermal stability and machining performance. The structural and mechanical properties of the coatings were characterized using X-ray diffraction and nanoindentation technique, respectively. The elemental composition, bonding structure, surface morphology and cross-sectional data were studied using energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy and field-emission scanning electron microscopy, respectively. Nanoscratch tests were performed to determine the adhesive strength of the coatings. The corrosion behavior of TiAlCrYN nanocomposite coatings on mild steel substrate was studied using potentiodynamic polarization in a 3.5% NaCl solution. Micro-Raman pectroscopy was used to characterize the structural changes as a result of heating of the nanocomposite coatings in air (600e 1000 �C). TiAlCrYN coatings prepared at 17 at.% Ti, 13 at.% Al, 21 at.% Cr and 1 at.% Y exhibited thermal stability as high as 900 �C in air (denoted as Sample 3). For the performance evaluation, the TiAlCrYN coated HSS drill bits were tested under accelerated machining conditions. With a drill speed of 800 rpm and a feed rate of 0.08 mm/rev the TiAlCrYN coated HSS drill bits (Sample 3) averaged 657 holes, while drilling a 12 mm thick 304 stainless steel plate under dry conditions, before failure. Whereas, the uncoated drill bits failed after drilling 50 holes under the same machining conditions. Results indicated that for the HSS drill bits coated with TiAlCrYN, the tool life increased by a factor of more than 12.

    Item Type: Journal Article
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    Division/Department: Surface Engineering Division, Other, Other, Other, Surface Engineering Division, Other, Other, Other
    Depositing User: Mr N Selvakumar
    Date Deposited: 01 Aug 2011 10:50
    Last Modified: 19 Sep 2011 11:41
    URI: http://nal-ir.nal.res.in/id/eprint/9755

    Actions (login required)

    View Item