Abstract
Iron (Fe) has attracted intensive attention as a bone implant material because of its inherent biodegradability, favorable biocompatibility and mechanical properties. Nevertheless, it degrades too slowly in a physiological environment, which limits its further clinical application. In this work, mesoporous carbon (MC) was introduced into Fe bone implant manufactured via a laser-additive manufacturing process. Particularly, MC possesses a noble standard corrosion potential and excellent electrical conductivity, thus acting as an effective cathode and activating micro-galvanic corrosion in the Fe matrix. More importantly, its high specific surface area enhanced the area ratio between cathode and anode, which further enhanced the galvanic corrosion effect. As a consequence, the corrosion rate was enhanced from 0.09 to 0.24 mm/year based on immersion tests. Besides, Fe/MC composite exhibited good cytocompatibility, as well as excellent mechanical properties. The positive results proved that the Fe/MC composite shows great potential as a bone implant.
Highlights
Biodegradable metal materials, including iron (Fe), magnesium and zinc, have currently drawn much attention for their potential bone repair application [1,2,3,4]
The Fe/mesoporous carbon (MC) composites were prepared on a home-made selective laser melting (SLM) machine, which consisted of a powder delivery system, a galvanometer scanner, intelligent purification cycle system and dust removal system
For Fe/0.5MC and Fe/1.0MC composites, BSE images showed that a small number of black particles were homogeneously located in the matrix
Summary
Biodegradable metal materials, including iron (Fe), magnesium and zinc, have currently drawn much attention for their potential bone repair application [1,2,3,4]. Previous studies confirmed that an increased area ratio of cathode and anode could enhance the galvanic corrosion effect [20–. Based on the above considerations, was effect introduced into Fe MC matrix aiming to obtain of cathode and anode could enhance the galvanicMC corrosion [20,21,22]. Fe/MC composite manufactured electrical conductivity, which can decrease the electron transfer resistancewas and increase corrosion using laser current density [23,24]. MC is expected to act as an effective galvanic corrosion activator in the additive manufacturing. MC was reported to be of favorable biocompatibility, and has been used as drug produce bone implants with a complex structure and personalized shape [26,27,28,29]. Laser additive manufacturing can cytocompatibility of Fe/MC composite was evaluated. Fe powder (99.9%, ~35 μm) was supplied from Shanghai Naiou Nano technology Co., Ltd, as
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