Abstract
Titanium alloys are the most dominating biomaterial in the field of orthopedic implants as they inhibit high strength-to-weight ratio, resistance toward wear and corrosion. It has been observed that after certain years of implantation, the implant exhibits corrosion and toxicity in the human body environment. Surface modification provides a novel technique to overcome these issues. In the present work, optimum EDM working parameters were investigated for the surface alteration of Ti-6Al-4V with MWCNTs mixed dielectric using a graphite tool with reverse polarity. Arcing was observed for discharge current above 4 Amps. Concentration of MWCNTs in the dielectric medium above 7 g/l exhibited unstable machining. In conclusions, lower current intensity, low MWCNTs concentration, and high pulse-off time demonstrated arc-free and stable machining of Ti-6Al-4V. SEM revealed a crack-free homogeneous porous surface that facilitates bioactivity. XRD exhibited the deposition of carbon and formation of carbides and intermetallic compounds on the EDMed surface.
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Bains, P.S., Singh, G., Bhui, A.S., Sidhu, S.S. (2019). Parametric Evaluation of Medical Grade Titanium Alloy in MWCNTs Mixed Dielectric Using Graphite Electrode. In: Bains, P., Sidhu, S., Bahraminasab, M., Prakash, C. (eds) Biomaterials in Orthopaedics and Bone Regeneration . Materials Horizons: From Nature to Nanomaterials. Springer, Singapore. https://doi.org/10.1007/978-981-13-9977-0_1
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