Selective laser melting of cobalt chromium molybdenum for 3d implant component

Ramli, Mohd Hazlen (2015) Selective laser melting of cobalt chromium molybdenum for 3d implant component. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The recent introduction of selective laser melting (SLM) for the processing of medical grade cobalt chromium (Co-Cr) alloy has led to a complex shape fabrication of porous custom Co-Cr alloy implants with controlled porosity to meet the requirements of the anatomy and functions at the region of implantation. Metal additive manufacturing (MAM) technique such as selective laser melting (SLM) process is progressively being utilized for new biomaterials such as cobalt-chrome-molybdenum (Co-Cr-Mo). The objective of this study is to analyze the effect of different structural design porosity of Cobalt-Chromium Molybdenum (Co-Cr-Mo) sample produced by laser sintering process. The second objective is to evaluate the mechanical and physical properties of open cellular structure Co-Cr-Mo samples fabricated by SLM with designed volume based porosity ranging between 0 % (full dense) to 80 %. A maximum 2.10 % shrinkage was successfully obtained by 80 % designed porosity sample. Samples with higher volume-to-surface area (full dense) demonstrated low total amount of shrinkage as compared to lower volume-to-surface area (80 % designed porosity). This paper also discusses mechanical characterization of porous medical grade Co-Cr alloy in cubical structures with volume based porosity ranging between 60% and 80% produced using SLM rapid manufacturing process. For compression test, 60% designed porosity exhibit higher elastic modulus compared to 70% and 80% designed porosity. Samples which undergo stress relief process behave more ductile and having higher strength compared to samples without stress relief. Which is samples which undergo 8 hour of stress relief process having higher compressive strength and elastic modulus compared to samples of 20 hour stress relief.

Item Type:Thesis (Masters)
Subjects:T Technology > TP Chemical technology > TP155-156 Chemical engineering
ID Code:7755
Deposited By:Mrs Hasliza Hamdan
Deposited On:05 May 2016 18:06
Last Modified:05 May 2016 18:06

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