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2011 International Conference on Future Materials Engineering and Industry Application(ICFMEIA 2011)

作者： Feng Lin Cheng Yan Wei Zheng Wei Fan Clayton Adam AdeKunle Oloyede Faculty of Built Environment and Engineering School of Engineering SystemsQueensland University of Technology Institute of Health & Biomedical Innovation Queensland University of Technology

Porous yttria-stabilized zirconia（YSZ） has been regarded as a potential candidate for bone substitute due to its high mechanical strength. However, porous YSZ is biologically inert to bone tissue. It is therefore necessary to introduce bioactive coatings onto the walls of the porous structures to enhance its bioactivity. In this study, porous YSZ scaffolds were prepared using a replication technique and then coated with mesoporous bioglass due to its excellent bioactivity. The microstructures were examined using scanning electron microscopy and the mechanical strength was evaluated via compression test. The biocompatibility and bioactivity were also evaluated using bone marrow stromal cell（BMSC） proliferation test and simulated body fluid test.

关键词： scaffold porous structure mesoporous bioglass zirconia(YSZ) Compressive strength

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In-situ deposition of apatite layer to protect Mg-based composite fabricated via laser additive manufacturing

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Journal of Magnesium and Alloys 2023年第2期11卷 629-640页

作者： Youwen Yang Changfu Lu Lida Shen Zhenyu Zhao Shuping Peng Cijun Shuai Institute of Bioadditive Manufacturing Jiangxi University of Science and TechnologyNanchang 330013China Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and AstronauticsNanjing 210016China Shenzhen Institute of Information Technology Shenzhen 518172China NHC Key Laboratory of Carcinogenesis School of basic Medical ScienceCentral South UniversityChangshaHunan 410013China School of energy and machinery engineering Jiangxi University of Science and TechnologyNanchang 330013China State Key Laboratory of High Performance Complex Manufacturing Central South UniversityChangsha 410083China

Biodegradable magnesium(Mg) and its alloy show huge potential as temporary bone substitute due to the favorable biocompatibility and mechanical compatibility. However, one issue deserves attention is the too fast degradation. In this work, mesoporous bioglass(MBG)with high pore volume(0.59 cc/g) and huge specific surface area(110.78 m^(2)/g) was synthesized using improved sol-gel method, and introduced into Mg-based composite via laser additive manufacturing. Immersion tests showed that the incorporated MBG served as powerful adsorption sites, which promoted the in-situ deposition of apatite by successively adsorbing Ca2+and HPO42-. Such dense apatite film acted as an efficient protection layer and enhanced the corrosion resistance of Mg matrix, which was proved by the electrochemical impedance spectroscopy measurements. Thereby, Mg based composite showed a significantly decreased degradation rate of 0.31 mm/year. Furthermore,MBG also improved the mechanical properties as well as cell behavior. This work highlighted the advantages of MBG in the fabrication of Mg-based implant with enhanced overall performance for orthopedic application.

关键词： Laser addictive manufacture Mg-based composite mesoporous bioglass In-situ deposition Degradation behavior

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