Affiliations: Institute for Graduate Studies in Pure and Applied Sciences, Marmara University, Göztepe-Istanbul, Turkey | Metallurgy and Material Engineering, Technology Faculty, Marmara University, Göztepe-Istanbul, Turkey | Department of Biology, Faculty of Science and Letter, Marmara University, Göztepe-Istanbul, Turkey | Chemistry Department, Marmara University, Göztepe-Istanbul, Turkey
Note: [] Address for correspondence: H. Ozkan Gulsoy, Metallurgy and Material Engineering, Technology Faculty, Marmara University, 34722, Göztepe-Istanbul, Turkey. Tel.: +90 216 3365770 322; Fax: +90 216 3378987; E-mail: ogulsoy@marmara. edu.tr.
Abstract: The research was investigated the effect of boron additions on sintering characteristics, mechanical, corrosion properties and biocompatibility of injection molded austenitic grade 316L stainless steel. Addition of boron is promoted to get high density of sintered 316L stainless steels. The amount of boron plays a role in determining the sintered microstructure and all properties. In this study, 316L stainless steel powders have been used with the elemental NiB powders. A feedstock containing 62.5 wt% powders loading was molded at different injection molded temperature. The binders were completely removed from molded components by solvent and thermal debinding at different temperature. The debinded samples were sintered at different temperature for 60 min. Mechanical property, microstructural characterization and electrochemical property of the sintered samples were performed using tensile testing, hardness, optical, scanning electron microscopy and electrochemical corrosion experiments. Sintered samples were immersed in a simulated body fluid (SBF) with elemental concentrations that were comparable to those of human blood plasma for a total period of 15 days. Both materials were implanted in fibroblast culture for biocompatibility evaluations were carried out. Results of study showed that sintered 316L and 316L with NiB addition samples exhibited high mechanical and corrosion properties in a physiological environment. Especially, 316L with NiB addition can be used in some bioapplications.
Keywords: Powder injection molding, sintering, biomaterials, in vitro, bioactivity simulated body fluid
