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

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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Hydrogen storage properties of ball-milled mg-based composite with PdCl_2 additive

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第9期8卷 1510-1513页

作者： WANG Xiu-li TU Jiang-ping ZHANG Pei-long ZHAO Xin-bing Department of Materials Science and Engineering Zhejiang University Hangzhou 310027 China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing 100083 China

mg-25 wt% mg2Ni composite was prepared by sintered method, hydrided at 613 K and then ball-milled with 1.5 wt% PdC12 additive for 51 h. The effects of PdCl2 on the hydriding and dehydriding behavior of mg-25 wt% mg2Ni composite were investigated. The absorption and desorption rate of the composite with PdCl2 is fast and the hydrogen storage capacity is more than that of the composite without PdCl2. The maximum hydrogen storage capacity reached 3.48 wt% at 373 K, and 5.05 wt% H at 453 K, respectively. The improvement of sorption and desorption kinetics is attributed to the catalytic effect of PdCl2, and the grain refining and lattice strain introduced by ball milling.

关键词： Hydrogen storage mg-based composite PdCl2 additive Ball milling

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