Novel one-dimensional template-grown coaxial SiC@carbon nanotubes (SiC@CNTs) were fabricated using a chemical vapor deposition method. To facilitate the formation of SiC on CNT template, a molecular-level mixing process was used to coat the surface of commercial multiwalled carbon nanotubes (MWCNTs) by Fe2O3. These Fe-CNTs were transformed into SiC@CNT nanotubes, which were then mixed with Al6061 alloy and consolidated by spark plasma sintering to obtain Al6061-SiC@CNT nanocomposites. The addition of 5 vol% SiC@CNT resulted in 58% enhancement in Young’s modulus and 46% enhancement in yield strength. Furthermore, the friction coefficient was reduced by 31% and the specific wear rate was reduced by 45%. The enhancement effect of Al6061-SiC@CNT on the mechanical and tribological properties was much greater than those of traditional nanoparticles, nanowires, and whiskers of SiCs. The extraordinary strengthening behavior of SiC@CNT, when compared with that of other SiC analogues, is attributed to the coaxial structure consisting of a SiC shell and CNT core. This coaxial structure enhanced the mechanical and tribological properties beyond that attainable with traditional SiC-derived reinforcements.
Abstract This study investigates the production of various reinforced and non-reinforced composite materials using powder metallurgy (PM). It presents the new approach into optimize the mechanical properties of hybrid composites (Al-SiC-B4C) produced with powder extrusion process. A16061 powders are used as the matrix material and B4C and SiC powders are used as the reinforcement materials. Matrix and reinforcement materials are mixed in a three-dimensional mixer. The mixtures are then subjected...
Abstract Graphene reinforced copper matrix (graphene/Cu) nanocomposite powders are fabricated by the molecular-level mixing process and consolidated by spark plasma sintering and pressureless sintering process followed by hot isostatic pressing for the full densification. The addition of 1.2% volume fraction of graphene in Cu matrix resulted in 1.9 and 1.3 times increase in yield strength and elastic modulus, respectively, in comparison to those of pure Cu fabricated by same sintering process. H...
#1Zhi Fang(USTB: University of Science and Technology Beijing)H-Index: 12
#2Qun Li(USTB: University of Science and Technology Beijing)H-Index: 7
Last. Xinmei Hou(USTB: University of Science and Technology Beijing)H-Index: 23
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Abstract A novel visible-light-driven Al4SiC4/rGO hybrid photocatalyst was fabricated using carbothermic reduction and hydrothermal methods. The as-prepared samples were characterized using various techniques and different factors during the photocatalytic reaction were well optimized. Compared with the commonly used photocatalysts, e.g. TiO2 (P25), g-C3N4, etc. the Al4SiC4/rGO hybrid not only exhibits super photocatalytic activity in the mixed system containing Cr(VI) and rhodamine B (RhB) but ...
Abstract In this paper, oxidized-silicon carbide particle/aluminum 6061 (oxidized-SiCp/Al6061) composites were fabricated using a spark plasma sintering technique. The microstructure, mechanical properties, and wear behavior of oxidized-SiCp/Al6061 composites were investigated. The results revealed an improvement in interfacial bond strength between Al6061 and oxidized SiCp due to the formation of an MgAl2O4 continuous phase and suppression of brittle Al4C3 formation at the interfacial layer. Ha...
Abstract Aluminium metal matrix nano composites (Al-MMNCs) are a new generation of materials that have the potential of satisfying the recent demands of advanced engineering applications. They are widely used in automobile industries, aircrafts, structural applications and many other defence systems. Researchers have been observed that the addition of nano sized SiCp particles with aluminium alloy matrix yields superior mechanical and physical properties and interfacial characteristics of nano c...
#1Wenna Liu(USTB: University of Science and Technology Beijing)H-Index: 9
#2Junhong Chen(USTB: University of Science and Technology Beijing)H-Index: 17
Last. Xinmei Hou(USTB: University of Science and Technology Beijing)H-Index: 23
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Coaxial nanocables (CNs) with an SiC core and a SiO2 shell were fabricated at a large scale by a simple and low cost method. The thickness of the SiO2 shell could be controlled by etching in 1 M NaOH aqueous solution for different amounts of time. XRD, SEM, TEM, HRTEM, PL and UV–Vis spectra were adopted to investigate the morphology and optical properties of the obtained SiC/SiO2CNs. Blue photoluminescence was observed at room temperature from the coaxial structure. The intensity of the single e...
Last. Jürgen Eckert(Austrian Academy of Sciences)H-Index: 103
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Al-12Si (80 vol%)-TiAlNbMoB (at.%) (TNM) composites were successfully produced by the selective laser melting (SLM). Detailed structural and microstructural analysis shows the formation of the AlMoTi intermetallic phase due to the reaction of the TNM reinforcement with the Al-12Si matrix during SLM. Compression tests reveal that the composites exhibit significantly improved properties (∼140 and ∼160 MPa higher yield and ultimate compressive strengths, respectively) compared with the Al-12Si matr...
#1Wenna Liu(USTB: University of Science and Technology Beijing)H-Index: 9
#2Junhong Chen(USTB: University of Science and Technology Beijing)H-Index: 17
Last. Xinmei Hou(USTB: University of Science and Technology Beijing)H-Index: 23
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The mechanical properties of dumbbell-shaped fiber-reinforced composites are expected to be improved via enhancing the interface adhesion between the matrix and the fibers from the viewpoint of biomimetics. In the present work, the mass production of dumbbell-shaped biomimetic SiC/SiO2 fibers via a facile carbothermal reduction method using gangue and carbon black as raw materials at 1500 °C in argon is reported. The phase and morphology of the obtained fibers were characterized using XRD, XPS, ...
Last. Lesley H. Chown(FUTA: Federal University of Technology Akure)H-Index: 7
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Abstract Aluminium hybrid composites are a new generation of metal matrix composites that have the potentials of satisfying the recent demands of advanced engineering applications. These demands are met due to improved mechanical properties, amenability to conventional processing technique and possibility of reducing production cost of aluminium hybrid composites. The performance of these materials is mostly dependent on selecting the right combination of reinforcing materials since some of the ...
To control the morphologies of one-dimensional (1D) nanostructures, especially during the catalyst-assisted growth of semiconductor nanostructures, is the key to unlock their potential applications. In this work, we demonstrate that, the morphology of the 1D silicon carbide (SiC) nanostructures can be controlled by manipulating the composition of the catalyst in the microwave plasma chemical vapor deposition process. It is revealed that iron silicide presents as the main catalyst to initiate the...
Abstract null null Carbon nanorods (CNRs) are significant one-dimensional carbon-based nanostructured materials. A new method to prepare direct growth fast-standing carbon nanorod as a promising electrode in symmetric supercapacitor applications has been explored. In this study, the CNRs are directly grown on SS plate in the three-zone horizontal chemical vapor deposition unit. The hydrogen free environment is used to grow the CNRs. The substrate position was studied by controlling the substrate...
Abstract In this study we aim at examining the effect of in-situ and ex-situ interfacial ceramic layers at the Al-CNT interface on the thermal expansion coefficient of aluminum matrix composites at different temperatures. For this, two types of bulk composite materials were obtained by a combination of high-energy ball milling and hot pressing methods. These materials were based on the aluminum alloy reinforced with CNT with in-situ Al4C3 and ex-situ TiC interface ceramic layers. It was found th...
Abstract Silicon is considered a valuable candidate for the anode material of lithium-ion batteries (LIBs) based on its high theoretical specific capacity and abundant resources in nature. Unfortunately, rapid capacity decay associated with volume expansion during cycling hinders the use of silicon in electrode materials for LIBs. Herein, we report nitrogen-doped carbon caging silicon nanoparticles (SiNP@NC cage) via simply coating and acid etching methods. The nitrogen-doped carbon shell can se...
Abstract Background Testicular hyperthermia can have negative effects on male fertility. Despite reported therapeutic benefits of curcumin, several factors often limit its application such as low water solubility and instable structure. Curcumin-loaded superparamagnetic iron oxide nanoparticles (SPIONs) were designed to solve its limitation of use. In the present study, we evaluated the effect of curcumin-loaded SPIONs on transient testicular hyperthermia in mouse. Materials and method A total o...
Last. Guoxin Xie(THU: Tsinghua University)H-Index: 19
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Owing to the diverse composition, adjustable performance, and synergistic effect among components, core–shell micro/nanoparticles have been widely applied in the field of tribology in recent years. The strong combination with the matrix and the good dispersion of reinforcing fillers in the composites could be achieved through the design of core–shell structural particles based on the reinforcing fillers. In addition, the performance of chemical mechanical polishing could be improved by optimizin...