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  • Trans Tech Publications, Ltd.  (380)
  • 1
    Online Resource
    Online Resource
    Characteristics of Particulate Matter about Emissions in a Heavy-Duty Diesel Engine with Biodiesel Blends
    Trans Tech Publications, Ltd. ; 2014
    In:  Advanced Materials Research Vol. 852 ( 2014-1), p. 802-807
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 852 ( 2014-1), p. 802-807
    Abstract: A China-V Heavy-duty diesel engine fueled with blends of 5%, 10%, 20%, 50% waste cooking oil biodiesel and diesel (marked separately BD5, BD10, BD20, BD50), pure biodiesel (BD100) and pure diesel (D100), was tested on full load speed characteristics and 1400 r/min and 2200 r/min load characteristics to study influence of biodiesel fuel and engine conditions on particle size distributions and particle number concentration. The results show that when fueled with blends containing less than 50% biodiesel, the particle number concentrations show single peak distribution curves (nucleation mode), for the pure biodiesel, particle number concentrations show bimodal distribution including nucleation mode and accumulation mode on full load speed characteristics and 1400 r/min and 2200 r/min load characteristics; on full load speed characteristics, for BD100, the peak of particle number concentration of BD100 is lowest, compared with D100, it is about one order of magnitude lower; on 1400r/min load characteristics, with the biodiesel proportion increasing, the number of nucleation mode and accumulation mode particles decreases; on lower than 1800 r/min full load speed characteristics and 1400 r/min and 2200 r/min load characteristics, with the biodiesel proportion increasing, the particle number concentration decreases.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.852
    DOI: 10.4028/www.scientific.net/AMR.852.802
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2265002-7
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  • 2
    Online Resource
    Online Resource
    Preparation of TC4-LY12 Joint by Vacuum Diffusion Welding
    Trans Tech Publications, Ltd. ; 2009
    In:  Advanced Materials Research Vol. 66 ( 2009-4), p. 242-245
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 66 ( 2009-4), p. 242-245
    Abstract: TC4-LY12 welding joint are fabricated by vacuum diffusion welding. The bonding phases are confirmed by X-Ray Diffraction (XRD), the morphology of samples and chemical composition are evaluated by Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Spectrometer (EDS) analysis, the mechanical property is tested by tensile strength measurement. The XRD patterns show that the main intermetallic compounds formed in the transition zone are Ti3Al, TiAl and TiAl3. Combining the fracture surfaces morphology and element analysis, the bonding mechanism of TC4-LY12 joint is attributed to the inter-diffusion between Ti and Al atoms. The initial phase formed during the reaction is TiAl3 due to the diffusion of titanium atoms into aluminum substrate; with the process of the reaction, Ti3Al and TiAl phases appear gradually with the atomic ratio of 1:1.The tensile strength of the joint increases remarkably with increase of temperature and takes a maximum value (~60MPa) when the welding temperature is 550°C.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.66
    DOI: 10.4028/www.scientific.net/AMR.66.242
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2265002-7
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  • 3
    Online Resource
    Online Resource
    Fabrication of Mg-W System FGM with Density Gradient by Hot-Press Sintering
    Trans Tech Publications, Ltd. ; 2009
    In:  Advanced Materials Research Vol. 66 ( 2009-4), p. 246-249
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 66 ( 2009-4), p. 246-249
    Abstract: Functionally graded material (FGM) with density gradient has showed great potentials as flier-plate for creating quasi-isentropic compression waves. In order to obtain a FGM with low density in the front face and with a wide density range, the Mg-W system gradient material is designed, and the power metallurgy method and hot-press (HP) sintering are chosen for its fabrication. The sintering of Mg-W alloys is studied at relative low temperatures and the processing of densification is mainly investigated. It is found that, up to 85wt%W, the approximately wholly dense Mg-W system alloys are achieved at 620°C for 1.5 hours under a pressure of 100MPa. Mainly the mechanical mixtures of Mg and W are formed in Mg-W alloys. And the Mg-W alloys are fully densified at 620°C due to the conglutination of Mg, a small amount of which are melting in this experimental condition. Finally, the Mg-W system FGM with a wide density gradient from 1.74g/cm3 to 7.56 g/cm3 within the 3.50mm thickness range is fabricated at the sintering parameter of 620°C-100MPa-1.5hours.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.66
    DOI: 10.4028/www.scientific.net/AMR.66.246
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2265002-7
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  • 4
    Online Resource
    Online Resource
    Study on the Dyeing of PET Fiber with Disperse Dyes in D5 Media
    Trans Tech Publications, Ltd. ; 2011
    In:  Advanced Materials Research Vol. 331 ( 2011-9), p. 334-337
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 331 ( 2011-9), p. 334-337
    Abstract: This experiment selected a new kind of environmental media (D5) instead of using water on the dyeing of PET, this work provided a new method for non-aqueous dyeing. The effects of the water addition, temperature, dyeing time and reagents on adsorption amount of disperse dye were studied, one good dyeing process is, adding 0.5mL water and 0.3mL ethanol into 20mL D5 system, the temperature of dyeing was 130°C, the preservation time of dyeing was 60min.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.331
    DOI: 10.4028/www.scientific.net/AMR.331.334
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2265002-7
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  • 5
    Online Resource
    Online Resource
    Preparation and Electrical-Conductive Property of SnO〈sub〉2〈/sub〉-Based Ceramics
    Trans Tech Publications, Ltd. ; 2010
    In:  Advanced Materials Research Vol. 105-106 ( 2010-4), p. 367-370
    Details
    In: Advanced Materials Research, Trans Tech Publications, Ltd., Vol. 105-106 ( 2010-4), p. 367-370
    Abstract: In this study, SnO2-based ceramics, with CuO as sintering aid and Sb2O3 as activator of the electrical conductivity, was obtained by pressure-less sintering at 1100°C ~ 1470°C. Addition of antimony leads to a higher densification temperature. Densification behavior and microstructure development are strongly dependant on CuO and Sb2O3. CuO gives rise to a liquid phase; Sb2O3 retards the formation of liquid phase and hinders the growth of grain. The electrical resistivities of SnO2-based ceramics vary in a wide range from 10-2 to 107 Ω•cm, depending on starting compositions and processing conditions. The electrical resistivities of samples with different amounts of CuO and Sb2O3 show different trends with the increasing of sintering temperature. The addition of antimony rapidly promotes electrical conductivity of SnO2-based ceramics containing CuO as the solid solution reaction of Sb2O3-SnO2. As the additions of CuO and Sb2O3 are the same, the electrical resistivity arrives the minimal value of 4.72×10-2 Ω•cm for 99%SnO2+0.5%CuO +0.5%Sb2O3 at 1470°C. More content of Sb2O3 than CuO causes the degression of density and the rising of electrical resistivity of ceramics.
    Type of Medium: Online Resource
    ISSN: 1662-8985
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/AMR.105-106
    DOI: 10.4028/www.scientific.net/AMR.105-106.367
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2010
    detail.hit.zdb_id: 2265002-7
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  • 6
    Online Resource
    Online Resource
    Effect of SiC Additions on Microstructure Evolution and Mechanical Properties of W-Based Composite Prepared by Arc-Melting
    Trans Tech Publications, Ltd. ; 2019
    In:  Materials Science Forum Vol. 944 ( 2019-1), p. 531-536
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 944 ( 2019-1), p. 531-536
    Abstract: In this study, the W-Si-C multi-phase composites were fabricated by an arc melting method. With addition of SiC, the grain size of W is obviously reduced, and the small angle misorientation becomes dominate, which is beneficial for the improvement of deformability. The effects of SiC additions (from 0.5 to 3wt%) on the microstructure and mechanical properties are mainly investigated. With 1 wt% SiC addition, the flexural strength reaches the highest value. The self-generation of W 5 Si 3 may enhance the strength and ductility, but too much W 5 Si 3 exists as brittle BP (Brittle to Plastic) microstructure. The highest flexural strength is obtained at approximately 1 vol% W 5 Si 3 .
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.944
    DOI: 10.4028/www.scientific.net/MSF.944.531
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2019
    detail.hit.zdb_id: 2047372-2
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  • 7
    Online Resource
    Online Resource
    Effect of pH on the Microstructure and Purity of Copper-Coated Tungsten Composite Powders Prepared by Electroless Plating
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 616 ( 2014-6), p. 62-65
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 616 ( 2014-6), p. 62-65
    Abstract: High-performance copper-coated tungsten composite powders were successfully prepared using electroless plating at an appropriate pH in the plating bath. The effect of pH value in the plating bath on the microstructure and purity of the coated Cu layer was studied systematically. With the increase of pH in the bath, the surface roughness, particle size and average grain size of coated Cu increased, and the particle shape gradually changed from round into square block. At pH 12–12.5, coated Cu was highly pure with very little oxygen content (less than 0.09 wt.%). The promotion effect of the increased pH on both main electroless plating reaction and side reactions causes the changes of surface morphology, average grain size of Cu and the oxygen content in the composite powders.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.616
    DOI: 10.4028/www.scientific.net/KEM.616.62
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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  • 8
    Online Resource
    Online Resource
    Liquid Phase Sintering of α-Si〈sub〉3〈/sub〉N〈sub〉4〈/sub〉 by Spark Plasma Sintering
    Trans Tech Publications, Ltd. ; 2007
    In:  Key Engineering Materials Vol. 336-338 ( 2007-4), p. 1062-1064
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 336-338 ( 2007-4), p. 1062-1064
    Abstract: In this study, spark plasma sintering (SPS) was applied to prepare α-Si3N4 ceramics of different densities with magnesia, silicon dioxide, alumina as the sintering aids. The sintering behavior and liquid phase sintering (LPS) mechanism were discussed and the factors influencing the density of the prepared samples were analyzed. Microstructures of sintered samples were observed and the phase compositions were analyzed. The results showed that α-Si3N4 ceramics can be sintered by SPS based on the reaction among α-Si3N4 and sintering additives which lead to the liquid phase and the density can be well controlled from 2.48 to 3.09 g/cm3 while the content of the sintering aids changes from 10% to 28.5% and sintering temperature from 1400°C to 1500°C.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.336-338
    DOI: 10.4028/www.scientific.net/KEM.336-338.1062
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2007
    detail.hit.zdb_id: 2073306-9
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  • 9
    Online Resource
    Online Resource
    〈i〉In Situ〈/i〉 Synthesis of Size-Controlled Silver/Poly(Methyl Methacrylate) Nanocomposite
    Trans Tech Publications, Ltd. ; 2017
    In:  Key Engineering Materials Vol. 727 ( 2017-1), p. 514-518
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 727 ( 2017-1), p. 514-518
    Abstract: In this work, monodispersed silver nanoparticles with controllable size have been successfully in situ synthesized in PMMA matrix. NaHS, HCl and poly (vinyl pyrrolidone) (PVP) were used to optimize the nucleation and growth of silver nanocrystalline. UV–vis analysis and transmission electron microscopy (TEM) were used to characterize the size and dispersion of silver nanoparticles in the Ag/PMMA nanocomposites. The results show that silver nanoparticles homogeneously distribute in PMMA/DMF sol and the particle size of silver nanoparticles increase with the increasing of time. The nucleation of Ag atoms can be facilitated through the addition of a trace amount of NaHS to generate Ag 2 S clusters as heterogeneous nuclei. Introducing a trace amount of Cl - into the reaction system can effectively reduce the growth rate of the nanoparticles and thus generating more uniform silver nanoparticles in PMMA matrix.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.727
    DOI: 10.4028/www.scientific.net/KEM.727.514
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2073306-9
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  • 10
    Online Resource
    Online Resource
    Microstructure and Properties of Aluminum-Copper Composites Prepared by Hot-Pressure Sintering
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 616 ( 2014-6), p. 212-216
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 616 ( 2014-6), p. 212-216
    Abstract: Aluminum (Al) and Copper (Cu) have been used in graded density impactors. Al-Cu composites with different compositions have been prepared by hot pressing sintering. Intermetallic compounds were produced when the temperature was above 723 K, while they can’t be found at the temperature of 723 K. The relative density of Al-Cu composites from pure Al to pure Cu consolidated at 723K all exceeded 98.5%. The optimum sintering conditions were then determined to sintering temperature of 723 K, uniaxial pressure of 100 MPa, and duration time of 2 h. Al and Cu were mixed homogeneously and well compacted, and no obvious pores were found. The thickness of diffusion layer between Al and Cu was very thin, only about 0.6 μm. The wave impedance values increased almost linearly from 16.98×10 6 to 40.66×10 6 kg/m 2 ·s with increasing Cu content in Al-Cu composite from 0 to 100 vol.%, which was well consistence with the values calculated according to the rule of mixtures. The elastic modulus of different compositions matched well with the theoretical model of Voigt and Reuss. Highly densified Al-Cu composites without intermetallic compounds were successfully prepared using hot-pressure sintering, which was the basis of fabricating Al-Cu system graded density impactors.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.616
    DOI: 10.4028/www.scientific.net/KEM.616.212
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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