4.7 Article

Machinability analysis of multi walled carbon nanotubes filled alumina composites in wire electrical discharge machining process

期刊

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 37, 期 9, 页码 3107-3114

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ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.03.058

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Alumina; MWCNT; Wire EDM; MRR; R-a

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The approach of machining ceramics with electrical discharge machining process is a great challenge till date due to its low electrical conductivity. Machining is made possible by reinforcing with a conductive phase which increases the overall electrical conductivity. Present work focuses on machining of multi walled carbon nanotubes filled alumina composites. Samples with concentrations ranging from 2.5 to 12.5 vol.% are considered for machining. At lower concentration of 2.5 vol.%, effective machining is not possible. Wire lag phenomena is observed during machining at 5 vol.% sample concentration. Proper machinability is observed with concentration of 7.5 vol.% or more. Also, long micro-cracks are obtained during machining that leads to the workpiece breakage. Spalling effect is observed as the most dominating material removal mechanism. A comparison between alumina composites and conducting metallic alloys were carried out for surface characteristics. (C) 2017 Elsevier Ltd. All rights reserved.

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