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Comparison of CVD and MOCVD-grown Al2O3 coatings in the performance of cemented carbide cutting tool inserts

Jaiswal, Piyush and Sathar, Abdul and Shariff, Arshiyan and Saif, Mohammed and Dhar, Sukanya and Shivashankar, SA (2011) Comparison of CVD and MOCVD-grown Al2O3 coatings in the performance of cemented carbide cutting tool inserts. In: MRS Proceedings, 1298 .

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Low-pressure MOCVD, with tris(2,4 pentanedionato)aluminum(III) as the precursor, was used in the present investigation to coat alumina on to cemented carbide cutting tools. To evaluate the MOCVD process, the efficiency in cutting operations of MOCVD-coated tools was compared with that of tools coated using the industry-standard CVD process.Three multilayer cemented carbide cutting tool inserts, viz., TiN/TiC/WC, CVD-coated Al2O3 on TiN/TiC/WC, and MOCVD-coated Al2O3 on TiN/TiC/WC, were compared in the dry turning of mild steel. Turning tests were conducted for cutting speeds ranging from 14 to 47 m/min, for a depth of cut from 0.25 to 1 mm, at the constant feed rate of 0.2 mm/min. The axial, tangential, and radial forces were measured using a lathe tool dynamometer for different cutting parameters, and the machined work pieces were tested for surface roughness. The results indicate that, in most of the cases examined, the MOCVD-coated inserts produced a smoother surface finish, while requiring lower cutting forces, indicating that MOCVD produces the best-performing insert, followed by the CVD-coated one. The superior performance of MOCVD-alumina is attributed to the co-deposition of carbon with the oxide, due to the very nature of the precursor used, leading to enhanced mechanical properties for cutting applications in harsh environment.

Item Type: Journal Article
Publication: MRS Proceedings
Publisher: Cambridge University Press
Additional Information: Copyright of this article belongs to Cambridge University Press.
Keywords: chemical vapor deposition (CVD) (deposition);coating;machining
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 17 Aug 2011 07:13
Last Modified: 17 Aug 2011 07:13
URI: http://eprints.iisc.ac.in/id/eprint/39926

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