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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1295-1300页

作者： Hui-min Xia Lan Zhang Yong-chao Zhu Na Li Yu-qi Sun Ji-dong Zhang Hui-zhong Ma School of Mechanics and Engineering Science Zhengzhou UniversityZhengzhou 450000China

A 0.3wt%graphene nanoplatelets(GNPs)reinforced 7075 aluminum alloy matrix(7075 Al)composite was fabricated by spark plasma sintering and its strength and wear resistance were *** microstructures of the internal structure,the friction surface,and the wear debris were characterized by scanning electron microscopy,X-ray diffraction,and Raman *** with the original 7075 aluminum alloy,the hardness and elastic modulus of the 7075 Al/GNPs composite were found to have increased by 29%and 36%,*** results of tribological experiments indicated that the composite also exhibited a lower wear rate than the original 7075 aluminum alloy.

关键词： 7075 aluminum alloy graphene nanoplatelets spark plasma sintering strength wear resistance

Electrical conductivity of the graphene nanoplatelets coated natural and synthetic fibres using electrophoretic deposition technique

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International Journal of Smart and Nano Materials 2018年第3期9卷 167-183,I0002页

作者： Hamid Souri Debes Bhattacharyya Centre for Advanced Composite Materials Department of Mechanical EngineeringThe University of AucklandAucklandNew Zealand

Herein,electrically conductive natural and synthetic yarns through electrophoretic deposition(EPD)technique were fabricated.A parametric study on the conductivity enhancement of the yarns is carried out by Taguchi *** this method,the desirable conditions are determined by studying the effects of important parameters on the electrical conductivity of the yarns in the EPD coating *** on the L18 design of experiments table,the preferred combination of factors to obtain the highest electrical conductivity of the yarns is found by Taguchi *** addition,the Pareto ANOVA analysis is conducted to identify the major contributing factors on the electrical conductivity of the *** techniques,such as scanning electron microscopy(SEM),Fourier transformed infrared spectroscopy(FTIR)in attenuated total reflectance(ATR)mode,and thermogravimetric analysis(TGA)are utilised for better understanding the microstructure and physical *** powered by only 3 V,the maximum temperature of a Joule heated conductive sample based on natural fibre yarns reached 102°C in less than 25 s.

关键词： graphene nanoplatelets electrical conductivity natural fibres electrothermal behaviour Taguchi method

Recent progress in ceramic matrix composites reinforced with graphene nanoplatelets

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Rare Metals 2020年第5期39卷 513-528页

作者： Bei-Ying Zhou Sheng-Jie Fan Yu-Chi Fan Qi Zheng Xin Zhang Wan Jiang Lian-Jun Wang Engineering Research Center of Advanced Glasses Manufacturing Technology Ministry of EducationDonghua UniversityShanghai 201620China Institute of Functional Materials Donghua UniversityShanghai 201620China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China School of Material Science and Engineering Jingdezhen Ceramic InstituteJingdezhen 333000China

graphene nanoplatelets(GNPs)are considered to be one of the most promising new reinforcements due to their unique two-dimensional structure and remarkable mechanical *** addition,their impressive electrical and thermal properties make them attractive fillers for producing multifunctional ceramics with a wide range of *** paper reviews the current status of the research and development of graphene-reinforced ceramic matrix composite(CMC)***,we focused on the processing methods for effective dispersion of GNPs throughout ceramic matrices and the reduction of the porosity of CMC ***,the microstructure and mechanical properties are provided,together with an emphasis on the possible toughening mechanisms that may ***,the unique functional properties endowed by GNPs,such as enhanced electrical/thermal conductivity,are discussed,with a comprehensive comparison in different ceramic matrices as oxide and nonoxide ***,the prospects and problems needed to be solved in GNPs-reinforced CMCs are discussed.

关键词： graphene nanoplatelets Ceramic matrix composites Processing methods Mechanical properties Functional properties

Synthesis and Thermal Characterization of Solar Salt-Based Phase Change Composites with graphene nanoplatelets

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Journal of Thermal Science 2024年第2期33卷 491-500页

作者： Pethurajan VIGNESHWARAN Saboor SHAIK Sivan SURESH Müslüm ARICI Asif AFZAL Department of Thermal and Energy Engineering School of Mechanical Engineering(SMEC)Vellore Institute of TechnologyVelloreTamil NaduIndia Nanotechnology Research Laboratory Department of Mechanical EngineeringNational Institute of TechnologyTiruchirappalliTamil NaduIndia Mechanical Engineering Department Engineering FacultyKocaeli UniversityUmuttepe CampusKocaeli41001Turkey Department of Mechanical Engineering P.A.College of Engineering(affiliated to Visvesvaraya Technological UniversityBelagavi)Mangaluru574153India

Thermal energy storage(TES) systems use solar energy despite its irregular availability and day-night temperature *** work reports the thermal characterizations of solar salt-based phase change composites in the presence of graphene nanoplatelets(GNP).Solar salt(60:40 of NaNO_(3):KNO_(3)) possessing phase transition temperature and melting enthalpy of 221.01℃ and 134.58 kJ/kg is proposed as a phase change material(PCM) for high-temperature solar-based energy storage *** conductivity must be improved to make them suitable for widespread applications and to close the gap between the system needs where they are *** is added at weight concentrations of 0.1%,0.3%,and 0.5% with solar salt using the ball milling method to boost its thermal *** studies indicated the formation of a uniform surface of GNP on solar *** spectrum peaks identified the physical interaction between salt and *** characterization of the composites,such as thermal conductivity,DSC and TGA was carried out for the samples earlier and later 300 thermal cycles.0.5% of GNP has improved the thermal conductivity of salt by 129.67% and after thermal cycling,the enhancement reduced to 125.21% indicating that thermal cycling has a minor impact on thermal *** change temperature decreased by around 2.32% in the presence of0.5% GNP and the latent heat reduced by 4.34% after thermal *** thermograms depicted the composites initiated the weight loss at around 550℃ after which it was *** thermal cycling,the weight loss initiated at ~40℃ lower compared to pure salt,which was found to be a minor *** characterization of solar salt and GNP-based solar salt composites revealed that the composites can be used for enhanced heat transfer in high-temperature solar-based heat transfer and energy storage applications.

关键词： thermal energy storage high temperature solar salt graphene nanoplatelets thermal characterization

Edge sulfurized graphene nanoplatelets via vacuum mechano-chemical reaction for lithium–sulfur batteries

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Journal of Energy Chemistry 2017年第3期26卷 522-529页

作者： Longlong Yan Min Xiao Shuanjin Wang Dongmei Han Yuezhong Meng The Key Laboratory of Low-Carbon Chemistry&Energy Conservation of Guangdong Province/State Key Laboratory of Optoelectronic Materials and Technologies School of Materials Science and EngineeringSun Yat-sen UniversityGuangzhou 510275GuangdongChina Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082GuangdongChina

Lithium–sulfur batteries have great potential for high energy applications due to their high capacities,low cost and eco-friendliness. However, the particularly rapid capacity decay owing to the dissolution and diffusion of polysulfide intermediate into the electrolyte still hamper their practical *** the reported preparation procedures to sulfur based cathode materials are often complex, and hence are rather difficult to produce at large scale. Here, we report a simple mechano-chemical sulfurization methodology in vacuum environment applying ball-milling method combined both the chemical and physical interaction for the one-pot synthesis of edge-sulfurized grapheme nanoplatelets with 3D porous foam structure as cathode materials. The optimal sample of 70%S–Gn Ps-48 h(ball-milled 48 h) obtains 13.2 wt% sulfur that chemically bonded onto the edge of Gn Ps. And the assembled batteries exhibit high initial discharge capacities of 1089 mAh/g at 0.1 C and 950 mAh/g at 0.5 C, and retain a stable discharge capacity of 776 mAh/g after 250 cycles at 0.5 C with a high Coulombic efficiency of over 98%. The excellent performance is mainly attributed to the mechano-chemical interaction between sulfur and grapheme nanoplatelets. This definitely triggers the currently extensive research in lithium–sulfur battery area.

关键词： Lithium sulfur batteries graphene nanoplatelets Edge-functionalized with sulfur 3D porous foam structure Mechano-chemical interaction

Simultaneously improving the strength and ductility of AZ91/GNPs composites through decorating graphene nanoplatelets with MgO

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Journal of Materials Science & Technology 2024年第16期183卷 133-151页

作者： Pingbo Wang Jun Shen Tijun Chen Jiqiang Ma Qinglin Li Shaokai Zheng State Key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals Lanzhou University of TechnologyLanzhou 730050China

Magnesium matrix composites(MgMCs)have always suffered low strengthening efficiency and poor ductility due to the difficulties in pursuing the well-bonded ***,graphene nanoplatelets(GNPs)were decorated with magnesium oxide nanoparticles(MgO NPs)through chemical co-precipitation and then incorporated into AZ91 alloy to fabricate MgMCs via powder *** effect of MgO on the interface of the Mg/graphene system was investigated based on the first-principles calculations,and the result indicated that modifying GNPs with MgO NPs was helpful in improving the Mg-GNP interface *** interface structural analysis revealed that the MgO NPs were firmly bonded with both GNPs andα-Mg through the distortion area bonding and semi-coherent interfacial bonding,severing as a bridge to fasten the interface bonding of *** addition,the MgO NPs on GNPs acted as a barrier to prevent GNPs from seriously reacting with the AZ91 *** a result,the AZ91/MgO@GNPs composite was endowed with enhancements of 31%and 10%in the yield strength,and increments of 71%and 61%in elongation compared with the AZ91 alloy and AZ91/GNPs composite,respectively,exhibiting a more significant potential in optimizing the strength-toughness tradeoffcompared with the AZ91/***,the possible strengthening and toughening mechanisms were also discussed in *** work offers a relatively novel surface modification strategy to modulate the Mg-GNP interface for a simultane-ous improvement of strength and ductility.

关键词： graphene nanoplatelets Magnesium oxide First-principles calculations Magnesium matrix composites Powder thixoforging

Influence of graphene nanoplatelets on mechanical properties and adhesive wear performance of epoxy-based composites

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Friction 2021年第4期9卷 856-875页

作者： K.Y.EAYAL AWWAD B.F.YOUSIF Khosro FALLAHNEZHAD Khalid SALEH Xuesen ZENG Faculty of Health Engineering and SciencesUniversity of Southern QueenslandToowoombaQLDAustralia Centre for Future Materials University of Southern QueenslandToowoombaQLDAustralia School of Mechanical and Mining Engineering University of QueenslandBrisbaneQLDAustralia

Epoxy resin is one of the most widely used thermoset polymers in high-performance composite materials for lightweight ***,epoxy has a high coefficient of friction,which limits its tribological *** this study,the effect was investigated of different weight fractions of solid lubricant graphene nanoplatelets(GNPs),ranging from 0 to 4.5 wt%,on mechanical and adhesive wear performance of *** wear tests covered mild and severe wear *** correlation of tribological and mechanical properties was studied as *** electron microscopy(SEM)was used to observe the failure mechanisms for both tribological and mechanical samples after each *** results revealed that the addition of GNPs to the epoxy improved its stiffness and hardness but reduced its fracture strength and *** wear performance exhibited high efficiency with GNP additions and showed reductions in the specific wear rate,the coefficient of friction,and the induced interface temperature by 76%,37%,and 22%,respectively.A fatigue wear mechanism was predominant as the applied load *** importantly,severe wear signs occurred when the interface temperature reached the heat distortion temperature of the *** tribological,and mechanical properties showed only a weak correlation to each *** addition of GNPs to epoxy by less than 4.5 wt%was highly efficient to improve the wear performance while maintaining the fracture strength and *** transform infrared spectroscopy(FTIR)analysis shows no chemical interaction between the epoxy matrix with GNPs,which implies its physical interaction.

关键词： graphene nanoplatelets epoxy adhesive wear solid lubricants

A novel method for preparing and characterizing graphene nanoplatelets/aluminum nanocomposites

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Nano Research 2018年第3期11卷 1642-1650页

作者： Duosheng Li Yin Ye Xiaojun Liao Qing H. Qin School of Materials Science and Engineering Nanchang Hangkong University Nanchang 330063 China Research School of Engineering Australian National University Acton ACT2601 Australia

graphene nanoplatelets/aluminum （GNPs/Al） nanocomposites were fabricated using a novel two-step method. High resolution transmission electron microscope （HRTEM）, Raman, field emission scanning electron microscopy （FESEM）, X-ray diffraction （XRD）, energy dispersive X-ray spectroscopy （EDS）, EDS mapping, and mechanical testing system （MTS） were applied to characterize the microstructure and mechanical properties of the GNPs/Al nanocomposites. The GNPs were homogeneously dispersed in GNPs/Al nanocomposites, and presented a fine interface behavior and microstructure characteristics. A harmful phase, aluminum carbide （Al4C3）, was not observed in significant quantities in the nanocomposite. Compared with pure aluminum, the mechanical properties of the GNPs/Al nanocomposites containing a low volume fraction of GNPs were sharply improved. When 0.5 vol.%, 1.0 vol.%, and 2.0 vol.% GNPs were added to the aluminum matrix, the average compressive strength of GNPs/A1 nanocomposites was 297, 345, and 527 MPa, respectively, which remarkably increased the strength over the original aluminum by 330% to 586%.

关键词： graphene nanoplatelets nanocomposites mechanical properties two-step method

Effect of graphene nanoplatelets addition on mechanical properties of pure aluminum using a semi-powder method

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Progress in Natural Science:Materials International 2014年第2期24卷 101-108页

作者： Muhammad Rashad Fusheng Pan Aitao Tang Muhammad Asif College of Materials Science and Engineering Chongqing University National Engineering Research Center for Magnesium Alloys Chongqing University Chongqing Academy of Science and Technology School of Materials Science and Engineering Dalian University of Technology

In recent years, graphene has attracted considerable research interest in all fields of science due to its unique properties. Its excellent mechanical properties lead it to be used in nano-composites for strength enhancement. This paper reports an Aluminum–graphene nanoplatelets(Al/GNPs)composite using a semi-powder method followed by hot extrusion. The effect of GNP nano-particle integration on tensile, compressive and hardness response of Al is investigated in this paper. It is demonstrated that 0.3 wt% graphene nanoplatelets distributed homogeneously in the matrix aluminum act as an effective reinforcing filler to prevent deformation. Compared to monolithic aluminum(in tension), Al–0.3 wt% GNPs composite exhibited higher 0.2% yield strength(+14.7%), ultimate tensile strength(+11.1%) and lower failure strain( -40.6%). Surprisingly, compared to monolithic Al(in compression), Al–0.3 wt% GNPs composite exhibited same 0.2% compressive yield strength and lower ultimate compression strength(- 7.8%),and lower failure strain(- 20.2%). The Al–0.3 wt% GNPs composite exhibited higher Vickers hardness compared to monolithic aluminum(+11.8%).Scanning electron microscopy(SEM), Energy-Dispersive X-ray Spectroscopy(EDS) and X-ray diffraction(XRD) were used to investigate the surface morphology, elemental percentage composition, and phase analysis, respectively.

关键词： Powder metallurgy method Mechanical properties Aluminum matrix graphene nanoplatelets

Effect of graphene nanoplatelets(GNPs)addition on strength and ductility of magnesium-titanium alloys

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Journal of Magnesium and Alloys 2013年第3期1卷 242-248页

作者： Muhammad Rashad Fusheng Pan Aitao Tang Yun Lu Muhammad Asif Shahid Hussain Jia She Jun Gou Jianjun Mao College of Material Sciences and Engineering Chongqing UniversityChongqing 400044China National Engineering Research Center for Magnesium Alloys Chongqing UniversityChongqing 400044China Chongqing Academy of Science and Technology Chongqing 401123China Graduate School&Faculty of Engineering Chiba UniversityChiba 263-8522Japan School of Material Sciences and Engineering Dalian University of TechnologyDalian 116024China

Effect of graphene nanoplatelets(GNPs)addition on mechanical properties of magnesium–10wt%Titanium(Mg–10Ti)alloy is investigated in current *** Mg-(10Ti+0.18GNPs)composite was synthesized using the semi powder metallurgy method followed by hot *** characterization results revealed the uniform distribution of reinforcement(Ti+GNPs)particles in the matrix,therefore(Ti+GNPs)particles act as an effective reinforcing filler to prevent the *** temperature tensile results showed that the addition of Ti+GNPs to monolithic Mg lead to increase in 0.2%yield strength(0.2%YS),ultimate tensile strength(UTS),and failure *** Electron Microscopy(SEM),Energy-Dispersive X-ray Spectroscopy(EDS)and X-Ray Diffraction(XRD)were used to investigate the surface morphology,elemental dispersion and phase analysis,respectively.

关键词： Magnesium Titanium graphene nanoplatelets Alloy Composite materials Powder metallurgy Mechanical properties