Performance evaluation of pulsed sputter deposited nanostructured TiAlN coated high-speed steel drill bits

Barshilia, Harish C and Jakeer, Khan and Praveen, Kumar and Rajam, KS (2007) Performance evaluation of pulsed sputter deposited nanostructured TiAlN coated high-speed steel drill bits. Technical Report. National Aerospace Laboratories.

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Abstract

We have deposited nanostructured TiAlN coatings on high-speed steel (HSS) drill bits and mild steel substrates using a four-cathode reactive direct current (DC) unbalanced magnetron sputtering system. Asymmetric-bipolar pulsed DC generators have been used to deposit TiAlN coatings from the reactive sputtering of Ti and Al targets in N2+Ar plasma. Various treatments have been given to the substrate for improved adhesion of the TiAlN coatings. The process parameters have been optimized to achieve highly adherent good quality TiAlN coatings. These coatings have been characterized using X-ray diffraction, X-ray photoelectron spectroscopy, nanoindentation, atomic force microscopy, wear tester, Potentiodynamic polarization techniques. The performance of the TiAlN coated HSS drill bits is evaluated by drilling a 13 mm thick 304 stainless steel plate, which is considered to be difficult to machine material. The performance evaluation tests have been carried out with and without coolant. The results show significant improvement in the performance of the TiAlN coated HSS drill bits. Furthermore, it has been shown that dry drilling of 304 stainless steel is possible with TiAlN coated HSS drill bits.

Item Type: Proj.Doc/Technical Report (Technical Report)
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
PHYSICS > Physics(General)
Division/Department: Surface Engineering Division, Surface Engineering Division, Surface Engineering Division, Surface Engineering Division
Depositing User: Dr. Harish C. Barshilia
Date Deposited: 31 Oct 2011 10:15
Last Modified: 31 Oct 2011 10:15
URI: http://nal-ir.nal.res.in/id/eprint/9973

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