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  • Trans Tech Publications, Ltd.  (8)
  • 2015-2019  (8)
  • 2018  (8)
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  • Trans Tech Publications, Ltd.  (8)
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  • 2015-2019  (8)
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  • 2018  (8)
  • 1
    Online Resource
    Online Resource
    On the Study of a TiB〈sub〉2〈/sub〉 Nanoparticle Reinforced 7075Al Composite with High Tensile Strength and Unprecedented Ductility
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 941 ( 2018-12), p. 1933-1938
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 941 ( 2018-12), p. 1933-1938
    Abstract: Strength and ductility are the two most important mechanical properties of a structural material. However, they are often mutually exclusive. In this study, a 6 wt. % TiB 2 nanoparticle reinforced 7075Al (i.e. TiB 2 /7075Al) composite was designed and produced by the processing route combining casting, friction stir processing, hot extrusion and T6 heat treatment. The result of tensile testing demonstrates that the as-processed composite sample presents an ultimate tensile strength of 677 MPa and a total elongation to failure of around 15 %, being higher than any Al or Al based materials ever reported. The typical microstructure contains the TiB 2 reinforcement nanoparticles uniformly distributed in the equiaxed Al grain matrix (2 μm in average grain size). In addition to the dispersed nanoprecipitates of the 7075Al (Al-Zn-Mg-Cu) matrix, the integrated TiB 2 nanoparticles are systematically decorated by a shell corresponding to (Zn 1.5 Cu 0.5 )Mg. This finding challenges our understanding and opens a door for further enhancing strength and ductility being easily scalable for industrial applications.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.941
    DOI: 10.4028/www.scientific.net/MSF.941.1933
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Molecular Dynamics Simulations of Atoms Diffusion in Solid
    Trans Tech Publications, Ltd. ; 2018
    In:  Diffusion Foundations Vol. 15 ( 2018-2), p. 51-64
    Details
    In: Diffusion Foundations, Trans Tech Publications, Ltd., Vol. 15 ( 2018-2), p. 51-64
    Abstract: Molecular dynamics (MD) simulations, which treat atoms as point particles and trace their individual trajectories, are always employed to investigate the transport properties of a many-body system. The diffusion coefficients of atoms in solid can be obtained by the Einstein relation and the Green-Kubo relation. An overview of the MD simulations of atoms diffusion in the bulk, surface and grain boundary is provided. We also give an example of the diffusion of helium in tungsten to illustrate the procedure, as well as the importance of the choice of interatomic potentials. MD simulations can provide intuitive insights into the atomic mechanisms of diffusion.
    Type of Medium: Online Resource
    ISSN: 2296-3642
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/DF.15
    DOI: 10.4028/www.scientific.net/DF.15.51
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 3098401-4
    detail.hit.zdb_id: 2766449-1
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Influence of Catalysts with Different Templates on Direct Decomposition of NO in Cement Kiln Exhaust
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 913 ( 2018-2), p. 948-953
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 913 ( 2018-2), p. 948-953
    Abstract: The influence of catalysts with different templates on direct decomposition of NO in cement kiln exhaust was studied in this paper. The NO direct decomposition rate of porous catalyst materials with different templates was determined by infrared spectrometer. And pore structure and the microstructure of the catalysts were characterized by BET surface area, nitrogen adsorption-desorption. The results show that the catalytic performance of porous catalyst without any template is better than catalysts with other templates at low temperature. When the temperature reached 550 °C, NO decomposition rate of porous catalyst with CTAB could reach to more than 80%. And meanwhile, the catalysts with organic template reagent have higher BET surface area than those with inorganic template agent. With the increasing of the reaction time, the NO decomposition rate decreases. After reaction for 3 hours, the decomposition rate decreases from 80% to 40%.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.913
    DOI: 10.4028/www.scientific.net/MSF.913.948
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Effect of Ammonia on CeO〈sub〉2〈/sub〉 Microspheres Prepared by Internal Gelation Process
    Trans Tech Publications, Ltd. ; 2018
    In:  Solid State Phenomena Vol. 281 ( 2018-8), p. 9-14
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 281 ( 2018-8), p. 9-14
    Abstract: The internal gelation process was used to prepare cerium dioxide microspheres. The effect of ammonia on the stability of the precursor solutions was investigated with the NH 3 ∙H 2 O/Ce (NH 4 ) 2 (NO 3 ) 6 molar ratio from 0 to 1.25. The surface morphology and microstructure of the sintered CeO 2 microspheres were analyzed. With the increase of NH 3 ∙H 2 O/Ce (NH 4 ) 2 (NO 3 ) 6 molar ratio, the solutions became more unstable, which indicated that their gelation was initiated. When the NH 3 ∙H 2 O/Ce (NH 4 ) 2 (NO 3 ) 6 ratio varied from 0 to 0.75, the surface of the microspheres became rougher and grain size became larger. Further increase in the NH 3 ∙H 2 O/Ce (NH 4 ) 2 (NO 3 ) 6 ratios to 1 and 1.25 led to CeO 2 microspheres with smooth surface and compact structure.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.281
    DOI: 10.4028/www.scientific.net/SSP.281.9
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2051138-3
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    Online Resource
  • 5
    Online Resource
    Online Resource
    Research on Lead (II) Adsorption Mechanism from Aqueous Solution by Calcium Carbonate Modified Diatomite Absorbent
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 921 ( 2018-5), p. 21-28
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 921 ( 2018-5), p. 21-28
    Abstract: In this study, calcium carbonate was used to coat and link the surface of diatomite for the formation of a novel modified adsorbent (referred to as Ca–diatomite). Various analytical techniques were used to characterize structure and mechanisms of modification and adsorption process, like Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD). Results showed that that Calcium carbonate had been successful grafted onto the surface of diatomite after modification, and Calcium carbonate modification improved the adsorption performance of diatomite for the removal of lead (II) ions from aqueous solution. Ca–diatomite adsorption isotherms and adsorption kinetics were also been studied. The adsorption isotherms and the kinetic data were best fitted with the Langmuir model and pseudo-second-order kinetics, respectively.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.921
    DOI: 10.4028/www.scientific.net/MSF.921.21
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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  • 6
    Online Resource
    Online Resource
    The Effects of Carbon Content on ZrCO Microspheres Prepared by Internal Gelation Process with Carbon Black
    Trans Tech Publications, Ltd. ; 2018
    In:  Solid State Phenomena Vol. 281 ( 2018-8), p. 195-199
    Details
    In: Solid State Phenomena, Trans Tech Publications, Ltd., Vol. 281 ( 2018-8), p. 195-199
    Abstract: ZrCO ceramic microspheres were fabricated by sol-gel combined with carbothermic reduction. The effect of carbon on the physicochemical characteristics of the microspheres was investigated. The results indicated that with the increase of carbon content in the broth, the interior structure of the sintered microspheres would become loose, which led to the lowering of the density and the decreasing of crush strength of the ZrCO microspheres. Crack-free ZrCO ceramic microspheres with the high mass fraction of ZrC could be successfully obtained with C/Zr = 3 in the broth sintered at 1550°C for 4h in argon containing 5%CO.
    Type of Medium: Online Resource
    ISSN: 1662-9779
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/SSP.281
    DOI: 10.4028/www.scientific.net/SSP.281.195
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2051138-3
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    Online Resource
  • 7
    Online Resource
    Online Resource
    Microfluidic Synthesis and Electrochemical Performance of Ternary Metals Nanoalloy: FePtSn
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 913 ( 2018-2), p. 831-837
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 913 ( 2018-2), p. 831-837
    Abstract: The ternary FePtSn alloy nanoparticles (NPs) were synthesized via a simple programmed microfluidic process, showing a great electrochemical performance in methanol oxidation reaction (MOR). The synthesis process exhibited convenient and spatial-temporal kinetics control of the NPs formation for a narrow size distribution, ultra-small (~2nm) and good dispersion features. The morphology, crystal structure and composition of FePtSn NPs were characterized by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD). FePtSn/C nanocatalyst ink could be further prepared by mixing the as-synthesized or annealed FePtSn NPs with carbon black powder and nafion. Their electrocatalytic performances were tested by the electrochemical work station. By contrast, the annealing treatment made more active sites exposed and facilitated the catalytic performance of FePtSn/C NPs. The electrochemical active surface areas (ECSAs, 42.8m 2 /g), catalytic activity (I f : 588.1 mA/mg-Pt) and electrochemical durability of FePtSn/C nanocatalysts after annealing were greatly improved, comparing with as-synthesized samples and commercial Pt/C nanocatalysts for MOR. In addition, the onset potential of annealed FePtSn/C nanocatalysts was improved, much better than the commercial Pt/C nanocatalysts.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.913
    DOI: 10.4028/www.scientific.net/MSF.913.831
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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  • 8
    Online Resource
    Online Resource
    Different Precipitant Preparation of Nickel-Doped Mn/TiO〈sub〉2〈/sub〉 Catalysts for Low-Temperature SCR of NO with NH〈sub〉3〈/sub〉
    Trans Tech Publications, Ltd. ; 2018
    In:  Materials Science Forum Vol. 913 ( 2018-2), p. 976-984
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 913 ( 2018-2), p. 976-984
    Abstract: The Mn-Ni/TiO 2 catalyst was prepared by co-precipitation method and investigated for the low-temperature selective catalytic reduction (SCR) of NO with NH 3 in this work, and Mn-Ni/TiO 2 catalysts were prepared by different precipitants respectively such as sodium hydroxide, carbamide, ammonia or hydrogen peroxide. The microstructure and performance of catalysts were investigated. The activitiesof catalysts prepared by different precipitants were studied in the temperature range 90°C-350°C. The results show that Mn-Ni/TiO 2 catalyst prepared by CO(NH 2 ) 2 -NH 3 ·H 2 O-H 2 O 2 compound precipitant has an extraordinary performance even at the low temperature of 120°C. H 2 -TPR results show the peak positions shift to lower temperatures, standing for the reduction potential of MnO x species is increased compared to those of Mn/TiO 2 catalysts. The interaction of Ni and Mn atoms is beneficial to an enhancement of the oxygen mobility due to CO(NH 2 ) 2 -NH 3 ·H 2 O-H 2 O 2 as precipitant. It is worth noting that the low temperature peak area increased by adding hydrogen peroxide as precipitant. NH 3 -TPD results illustrat that for the Mn/TiO 2 and Mn-Ni/TiO 2 catalysts which are attributed to NH 3 desorbed by weak acid sites and Brønsted acid sites.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.913
    DOI: 10.4028/www.scientific.net/MSF.913.976
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2018
    detail.hit.zdb_id: 2047372-2
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