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

作　　者：Youwen Yang Changfu Lu Lida Shen Zhenyu Zhao Shuping Peng Cijun Shuai 

机构地区：[1]Institute of Bioadditive Manufacturing,Jiangxi University of Science and Technology,Nanchang 330013,China [2]Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology,Nanjing University of Aeronautics and Astronautics,Nanjing 210016,China [3]Shenzhen Institute of Information Technology,Shenzhen 518172,China [4]NHC Key Laboratory of Carcinogenesis,School of basic Medical Science,Central South University,Changsha,Hunan 410013,China [5]School of energy and machinery engineering,Jiangxi University of Science and Technology,Nanchang 330013,China [6]State Key Laboratory of High Performance Complex Manufacturing,Central South University,Changsha 410083,China

出　　处：《Journal of Magnesium and Alloys》2023年第2期629-640,共12页镁合金学报（英文）

基　　金：National Natural Science Foundation of China (51935014,52165043, 82072084, 81871498);Jiang Xi Provincial Natural Science Foundation of China (20192ACB20005,2020ACB214004);The Provincial Key R&D Projects of Jiangxi (20201BBE51012);Guangdong Province Higher Vocational Colleges&Schools Pearl River Scholar Funded Scheme (2018);Shenzhen Science and Technology Plan Project (JCYJ20170817112445033);Innovation Team Project on University of Guangdong Province(2018GKCXTD001);Technology Innovation Platform Project of Shenzhen Institute of Information Technology 2020(PT2020E002);China Postdoctoral Science Foundation(2020M682114);Open Research Fund of Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology。

摘　　要：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 

分 类 号：TB33[一般工业技术—材料科学与工程]