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Hollow silica reinforced magnesium nanocomposites with enhanced mechanical and biological properties with computational modeling analysis for mandibular reconstruction

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International Journal of Oral Science 2020年第4期12卷 298-308页

作者： Somasundaram Prasadh Vyasaraj Manakari gururaj parande Raymond Chung Wen Wong Manoj Gupta Faculty of Dentistry National University of Singapore9 Lower Kent Ridge RoadSingaporeSingapore Department of Mechanical Engineering National University of Singapore9 Engineering Drive 1SingaporeSingapore

The present study investigates Mg-SiO2 nanocomposites as biodegradable implants for orthopedic and maxillofacial *** effect of presence and progressive addition of hollow silica nanoparticles(0.5,1,and 1.5)vol.%on the microstructural,mechanical,degradation,and biocompatibility response of pure Mg were *** suggest that the increased addition of hollow silica nanoparticles resulted in a progressive increase in yield strength and ultimate compressive strength with Mg-1.5 vol.%SiO2 exhibiting superior *** response of Mg-SiO2 nanocomposites under the influence of Hanks’balanced salt solution revealed that the synthesized composites revealed lower corrosion rates,indicating rapid dynamic passivation when compared with pure ***,cell adhesion and proliferation of osteoblast cells were noticeably higher than pure Mg with the addition of 1 vol.%SiO2 *** biocompatibility and the in vitro biodegradation of the Mg-SiO2 nanocomposites were influenced by the SiO2 content in pure Mg with Mg-0.5 vol.%SiO2 nanocomposite exhibiting the best corrosion resistance and biocompatibility when compared with other *** in mechanical,corrosion,and biocompatibility characteristics of Mg-SiO2 nanocomposites developed in this study are also compared with properties of other metallic biomaterials used in alloplastic mandibular reconstruction in a computational model.

关键词： corrosion magnesium properties

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Using lanthanum to enhance the overall ignition, hardness, tensile and compressive strengths of Mg-0.5Zr alloy

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Journal of Rare Earths 2017年第7期35卷 723-732页

作者： Ganesh Kumar Meenashisundaram Tiong Hou Damien Ong gururaj parande Vyasaraj Manakari 向抒林 Manoj Gupta Singapore Institute of Manufacturing and Technology 73 Nanyang Drive Singapore 637662 Singapore Department of Mechanical Engineering National University of Singapore 9 Engineering Drive 1 Singapore - 117576 Singapore School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001 China

Near dense Mg 0.5 wt.% Zr（0,1,2.5 and 4） wt.% La alloys were successfully synthesized by disintegrated melt deposition technique followed by hot extrusion and were characterized for their microstructural, ignition, hardness, tensile and compression properties. Combined effects of Zr and La assisted in significant grain refinement of Mg and Mg 0.5 wt.% Zr 4 wt.% La exhibited an average grain size as low as ~2.75 μm. High ignition temperature of ~645 oC was realized with Mg 0.5 wt.% Zr（1,2.5 and 4） wt.% La alloys. Microhardness value as high as ~103 Hv was observed with Mg 0.5 wt.% Zr 4 wt.% La alloy. Under room temperature tensile and compression loading, significant improvements in the strength properties of pure Mg with the addition of 0.5 wt.% Zr（0, 1, 2.5 and 4） wt.% La was observed. Mg 0.5 wt.% Zr 4 wt.% La exhibited the maximum 0.2% tensile and compression yield strengths of ~283 MPa and ~264 MPa, respectively. The tensile and compression fracture strain values of synthesized pure Mg were found to be unaffected with the addition of 0.5 wt.% Zr. But the tensile fracture strain reduced with the addition of La while the compressive fracture strain was unaffected. Minimal tensile-compression asymmetry（~1） was exhibited by Mg 0.5 wt.% Zr（1 and 2.5） wt.% La alloys.

关键词： Mg-Zr-La alloy ignition microhardness tensile properties compression properties tensile-compression asymmetry rare earths

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Investigation on dry sliding wear behavior of Mg/BN nanocomposites

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Journal of Magnesium and Alloys 2018年第3期6卷 263-276页

作者： R.Vara Prasad Kaviti D.Jeyasimman gururaj parande Manoj Gupt R.Narayanasamy Department of Mechanical Engineering Periyar Maniammai Institute of Science&TechnologyThanjavur 613403 Tamil Nadu India b Department of Mechanical EngineeringNational Institute of Singapore9 Engineering driveSingapore 117576Singapore Department of Production Engineering National Institute of TechnologyTiruchirappalli 620015Tamil NaduIndia

The present research objective is to investigate the effect of boron nitride nanoparticles reinforcement on dry sliding wear behavior of pure Magnesium and magnesium *** fabricated nanocomposites contains varied percentages of boron nitride such as 0%(pure Mg),0.5%,1.5%and 2.5%were synthesized by using powder metallurgy technique and followed by a hot working process called hot *** pin on disk equipment was used for conducting the wear tests for traditional loads of 5 N,7 N and 10 N at different sliding speeds of 0.6,0.9 and 1.2 m/s against the steel disk at room *** all traditional loads and sliding speeds,the changes in wear rate and friction co-efficient(μ)with respect to sliding distances were observed and *** wear characteristics are observed with the help of scanning electron microscopy under given test *** investigate dominant wear mechanisms for various test conditions,the morphologies of all worn composites surfaces were *** results show that,for all nanocomposites the wear level raises with respect to the sliding speeds and *** reinforced with 0.5%boron nitride shows lower wear rates and low friction coefficient values compare with magnesium reinforced with 1.5%boron nitride and 2.5%boron nitride nanocomposites.

关键词： Metal matrix composites Wear Friction coefficient Wear mechanisms

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Enhanced performance of nano-sized SiC reinforced Al metal matrix nanocomposites synthesized through microwave sintering and hot extrusion techniques

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Progress in Natural Science:Materials International 2017年第5期27卷 606-614页

作者： M.Penchal Reddy R.A.Shakoor gururaj parande Vyasaraj Manakari F.Ubaid A.M.A.Mohamed Manoj Gupta Center for Advanced Materials Qatar University Department of Mechanical Engineering National University of Singapore Department of Metallurgical and Materials Engineering Suez University

In the present study, nano-sized SiC(0, 0.3, 0.5, 1.0 and 1.5 vol%) reinforced aluminum(Al) metal matrix composites were fabricated by microwave sintering and hot extrusion techniques. The structural(XRD, SEM),mechanical(nanoindentation, compression, tensile) and thermal properties(co-efficient of thermal expansionCTE) of the developed Al-SiC nanocomposites were studied. The SEM/EDS mapping images show a homogeneous distribution of SiC nanoparticles into the Al matrix. A significant increase in the strength(compressive and tensile) of the Al-SiC nanocomposites with the addition of SiC content is observed. However,it is noticed that the ductility of Al-SiC nanocomposites decreases with increasing volume fraction of SiC. The thermal analysis indicates that CTE of Al-SiC nanocomposites decreases with the progressive addition of hard SiC nanoparticles. Overall, hot extruded Al 1.5 vol% SiC nanocomposites exhibited the best mechanical and thermal performance as compared to the other developed Al-SiC nanocomposites.

关键词： Al-SiC nanocomposites Microwave sintering Hot extrusion Mechanical properties Thermal expansion

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