Deposition and characterization of TiAlSiN nanocomposite coatings prepared by reactive pulsed direct current unbalanced magnetron sputtering

Barshilia, Harish C and Moumita, Ghosh and Shashidhara, Acharya and Raja, Ramakrishna and Rajam, KS (2010) Deposition and characterization of TiAlSiN nanocomposite coatings prepared by reactive pulsed direct current unbalanced magnetron sputtering. Applied Surface Science, 256 (21). pp. 6420-6426. ISSN 0042-207X

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Abstract

This work reports the performance of high speed steel drill bits coated with TiAlSiN nanocomposite coating at different Si contents (5.5–8.1 at.%) prepared using a four-cathode reactive pulsed direct current unbalanced magnetron sputtering system. The surface morphology of the as-deposited coatings was characterized using field emission scanning electron microscopy. The crystallographic structure, chemical composition and bonding structure were evaluated using X-ray diffraction, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, respectively. The corrosion behavior, mechanical properties and thermal stability of TiAlSiN nanocomposite coatings were also studied using potentiodynamic polarization, nanoindentation and Raman spectroscopy, respectively. The TiAlSiN coating thickness was approximately 2.5–2.9�m. These coatings exhibited a maximum hardness of 38 GPa at a silicon content of approximately 6.9 at.% and were stable in air up to 850 ◦C. For the performance evaluation, the TiAlSiN coated drills were tested under accelerated machining conditions by drilling a 12mmthick 304 stainless steel plate. Under dry conditions the uncoated drill bits failed after drilling 50 holes, whereas, TiAlSiN coated drill bits (Si = 5.5 at.%) drilled 714 holes before failure. Results indicated that for TiAlSiN coated drill bits the tool life increased by a factor of more than 14.

Item Type:	Article
Uncontrolled Keywords:	TiAlSiN nanocomposite coatings, Structure and properties Reactive magnetron sputtering, Performance evaluation
Subjects:	CHEMISTRY AND MATERIALS > Chemistry and Materials (General) CHEMISTRY AND MATERIALS > Composite Materials
Depositing User:	Mr N Selvakumar
Date Deposited:	01 Aug 2011 08:22
Last Modified:	01 Aug 2011 08:22
URI:	http://nal-ir.nal.res.in/id/eprint/9752

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