Optimization of Mg Content in Novel Bioactive Ti-Mg Composite Produced by Warm Powder Consolidation Process
The paper introduces titanium-magnesium(Ti-Mg)composite manufactured by warm consolidation powder metallurgy(PM)approach to be used as a dental implant.Composite structure consists of bioinert Ti matrix,which provides mechanical properties after implantation process,and biodegradable Mg component,which has a dual role:(1)it decreases the Young`s modulus(E)and(2)it selectively elutes from surface and volume of implant after implantation,and leaves pores on a prior location,which act as sites for new bone ingrowth.That leads to an improvement of existing material concepts of dental implants based on commercial purity(CP)Ti and TiAl6V4,which suffer from stress-shielding effect and insufficient implant`s surface bioactivity.In this study,a performance of Ti-Mg composite was optimized as a function of Mg component,extending from 0 to 24 vol.%,and particle size fraction of Ti powder at different extrusion ratio.The microstructure and mechanical properties of as-extruded composites were characterized by scanning electron microscopy(SEM)equipped by energy dispersive spectrometry(EDS),tensile mechanical testing and dynamic mechanical analysis(DMA).The results obtained for Ti-Mg composite extruded at high reduction ratio showed homogenous structure in which,Ti matrix is embedded with Mg and both are in direct contact at the interfaces without any pores,voids or increased oxygen(O)content.The composites with 24 vol.%Mg reached E = 81 GPa,yield strength of 340 MPa,ultimate tensile strength of 409 MPa and ductility of 1.1%,which are adequate values for endosseous dental implant application.
Composite Titanium-Magnesium Powder metallurgy Extrusion Microstructure Mechanical properties Implant Dental
Ibrahim Ahmed Mohamed Hassan Balog Martin Krizik Peter Catic Amir Schauperl Zdravko
Institute of Materials and Machine Mechanics,The Slovak Academy of Sciences,Dubravska Cesta 9,84513 Institute of Materials and Machine Mechanics,The Slovak Academy of Sciences,Dubravska Cesta 9,84513 School of Dental Medicine,University of Zagreb,Gunduliceva 5,10000 Zagreb,Croatia Faculty of Mechanical Engineering and Nnaval Architecture,University of Zagreb,Ivana Lucica 5,10000
国际会议
北京
英文
1825-1831
2018-09-16（万方平台首次上网日期，不代表论文的发表时间）