Effect of pretreatment process on thermal oxidation of biomedical grade cobalt based alloy

S., Izman and M. A., Hassan and Mas Ayu, Hassan and Mohammed Rafiq, Abdul Kadir and Mohammed Ruslan, Abdullah and Mahmood, Anwar and A., Shah and R., Daud (2012) Effect of pretreatment process on thermal oxidation of biomedical grade cobalt based alloy. Advanced Materials Research, 399-401. pp. 1564-1567. ISSN 1022-6680 (print), 1662-8985 (online)

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Wear on Co-Cr-Mo biomedical implants is still a major issue especially for applications in articulation joints like in total ankle, knee and hip arthroplasty. Generation of excessive wear particles can coagulate in body tissues which later cause inflammation, bone loss and necrosis. Modification of implant surfaces is a common technique for increasing the hardness and thus minimizing these effects. In this study, thermal oxidation method was carried out on the Co-Cr-Mo to investigate the effects of different pretreatment processes and surface roughness on the hardness of oxide layer formed. Prior to oxidation process, all samples were annealed and pickled to remove residual stress and oxide scales respectively. The oxidation process was done inside furnace under atmospheric condition for 3 hours at 1160 °C. The metallic compositions, surface morphology and hardness of the oxide layer formed on the substrate were verified using X-ray diffraction (XRD), scanning electron microscope and micro-Vickers hardness analysis respectively. It is found that mechanical pretreatment provides oxide/carbide layer with higher hardness than chemical pretreatment method. It is believed that remnants of polishing diamond pastes trapped in roughness valleys react with metal matrix and later transform into carbides during oxidation process. In contrast, initial surface roughness of the substrate has no significant effect on the hardness of oxide/carbide layer.

Item Type: Article
Additional Information: Indexed by Scopus
Uncontrolled Keywords: Biomaterial; Co-Cr-Mo; Hardness; Implant; Pretreatment; Thermal Oxidation; Wear
Subjects: T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Faculty/Division: Faculty of Mechanical and Automotive Engineering Technology
Depositing User: Mrs Norsaini Abdul Samat
Date Deposited: 05 May 2020 07:53
Last Modified: 05 May 2020 07:53
URI: http://umpir.ump.edu.my/id/eprint/28110
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