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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
    Fabrication and Properties of W-Cu Functionally Graded Material by Tape-Casting
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 616 ( 2014-6), p. 66-71
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 616 ( 2014-6), p. 66-71
    Abstract: In this paper, the W-Cu functionally graded material (FGM) was prepared by using the non-aqueous tape-casting technique combined with vacuum hot-pressing sintering. The graded composite material with high density, uniform transition and graded component was designed by 7 layers with the copper content range from 40 to 100 wt. %. Then the structures and properties of the composite were characterized. The scanning acoustic microscope (SAM) results for the W-Cu graded material showed that the interface between different layers was of high smoothness and parallel. The SEM-EDS results of cross section show that the W and Cu content changed gradually along the laminating direction after sintering. The equivalent electrical conductivity and the equivalent thermal conductivity of the W-Cu graded material were 0.3976×10 8 S/m and 323.5 W/(m·K), respectively, which were much higher than that of the W-40 wt. % Cu homogeneous composite. The Vickers hardness of the high tungsten content surface and the high copper surface were 163 HV and 80 HV, respectively, which were same with that of the homogeneous material.
    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.616.66
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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  • 3
    Online Resource
    Online Resource
    Hot-Press Sintering of the W-40wt.%Cu Composite Tape-Casting Film
    Trans Tech Publications, Ltd. ; 2017
    In:  Key Engineering Materials Vol. 727 ( 2017-1), p. 966-971
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 727 ( 2017-1), p. 966-971
    Abstract: In this research, the W-40wt.%Cu composite tape-casting films were prepared through the vacuum hot-press sintering method, and the effect of sintering temperature on the microstructures and properties of the W-40wt.%Cu composite samples was studied. Microstructures of the W-40wt.%Cu tape-casting film and the prepared samples were analyzed by field emission scanning electron microscopy (FE-SEM). The phase of the samples was investigated by X-ray diffraction (XRD). The relative density, Vickers hardness, bending strength and electrical conductivity of the samples were investigated. The results show that the relative density of the W-40wt.%Cu composite materials enhances with the increasing of the sintering temperature, at the same time the mechanical and electrical properties are better with the increasing of the sintering temperature. The W-40wt.%Cu composites prepared at the condition of 900°C-200MPa-2h have the relative density of 97%, the bending strength of 507.3MPa, the Vickers hardness of 376.2HV and the electrical conductivity of 32.5% IACS, respectively.
    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.727.966
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2017
    detail.hit.zdb_id: 2073306-9
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  • 4
    Online Resource
    Online Resource
    The Structure and Electrical Conductivity of the CNTs/PMMA Nanocomposites Foams
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 602-603 ( 2014-3), p. 1048-1051
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 602-603 ( 2014-3), p. 1048-1051
    Abstract: Carbon nanofillers/polymer nanocomposites foam with electrical conductivity was a novel functional material. In this study, the CNTs/PMMA nanocomposites were prepared by the combination of ultrasonic dispersion and anti-solvent precipitation method. Then supercritical foaming method was untilized applied to prepare the foams. The morphology and the electrical conductivity of the foams were investigated. The conductivity of the nanocomposites showed a conductor behavior which was increased t from 1×10 -6 S/cm to 1×10 -5 S/cm with the CNTs content range from 1 wt.% to 2.5 wt.%. After foaming, the cell size of the foams was below 10 μm while the cell density increased 2~3 orders of magnitude compared with PMMA foams. The produced CNTs/PMMA nanocomposites foams exhibited a wide range electricity conductivity of the nanofiller contents. Key words: structure, electrical conductivity, CNTs, nanocomposites foams
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.602-603
    DOI: 10.4028/www.scientific.net/KEM.602-603.1048
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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  • 5
    Online Resource
    Online Resource
    The Effect of Sb Content on Spark Plasma Sintered High-Density Antimony-Doped Tin Oxide Ceramics
    Trans Tech Publications, Ltd. ; 2011
    In:  Materials Science Forum Vol. 687 ( 2011-6), p. 204-208
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 687 ( 2011-6), p. 204-208
    Abstract: Spark plasma sintering (SPS) is a newly developed technique that enables poorly sinterable tin oxide powder to be fully densified. Sintering without sintering aids is of great importance when SnO 2 ceramics are used as electrodes in the glass melting industry and aluminum electrometallurgy. Dense and good-conductive Antimony-doped SnO2 ceramics can be achieved by SPS at a lower sintering temperature and in a shorter time. When the Sb 2 O 3 concentration is 1.0 mol%, the densities of the samples reach their maximum value, which is 98.2% of the theoretical value. When the content of Sb 2 O 3 was 2.44mol%, SnO 2 ceramics with densities 97.6% can be obtained at 800°C-1000°C, and the resistivity was about 5.19×10 -2 Ω.cm at the sintering temperature of 1000°C. Defined amount of Sb 3+ used in our research are beneficial to low the sintering temperature and promote the densification of SnO 2 ceramics
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.687
    DOI: 10.4028/www.scientific.net/MSF.687.204
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2011
    detail.hit.zdb_id: 2047372-2
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  • 6
    Online Resource
    Online Resource
    Calculation of Tape Thickness for Ceramic Tape Casting
    Trans Tech Publications, Ltd. ; 2012
    In:  Key Engineering Materials Vol. 512-515 ( 2012-6), p. 328-333
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 512-515 ( 2012-6), p. 328-333
    Abstract: Tape casting play a significant role in industrial area, such as multilayered ceramic (MLC) packages, functionally graded materials (FGM), low temperature co-fired ceramics (LTCC) and so on. For the complexity of the rheology for slurry during tape casing process, the control of tape thickness by experience was unstable. Although few numerical and analytical studies on predicting the tape thickness have been done, but these efforts have focused on Newtonian, Bingham, Power law, respectively. There is no unified equation to calculate the tape thickness among different rheological models. In this paper, the calculation results are characterized by wide adaptability; the blade gap, the casting speed and the slurry rheological property are incorporated into calculation; the effect of parameters in the result is studied; Parameter P nd can be used as a guide to check which mark patterns of the flow velocity profiles in the channel. The results proposed and the experimental measurements from existing publications are in close agreement. Compared with the prediction of the existing models, the calculation results proposed has good agreement with them.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.512-515
    DOI: 10.4028/www.scientific.net/KEM.512-515.328
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2073306-9
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  • 7
    Online Resource
    Online Resource
    Study on Microstructure and Property of Diffusion-Bonded Mo-Cu Joints
    Trans Tech Publications, Ltd. ; 2012
    In:  Key Engineering Materials Vol. 508 ( 2012-3), p. 178-182
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 508 ( 2012-3), p. 178-182
    Abstract: Mo and Cu Were Bonded Successfully by Means of Vacuum Diffusion Bonding. The Interfacial Structure of the Joints Was Studied by Scanning Electron Microscopy (SEM), Electron Probe Microanalysis (EPMA), Energy Dispersive X-Ray Spectrometer (EDS) and X-Ray Diffraction (XRD), the Mechanical Property Is Tested by Tensile Strength Measurement. The Results Showed that the Differentatoms Diffused to each other in the Bonding Process. A Mo-Cu Solid Solution Was Formed in the Joint and with No Intermetallic Compounds. The Tensile Strength of the Joint Increased with the Increasing of Temperature, however, while the Holding Time Increased, the Strength Increased in the First Stages and then Decreases. It Were Observed that the Fracture Mode of the Joints Was a Brittle Fracture.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.508
    DOI: 10.4028/www.scientific.net/KEM.508.178
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2073306-9
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  • 8
    Online Resource
    Online Resource
    Foaming of CNTs/PMMA Nanocomposite with Supercritical Carbon Dioxide
    Trans Tech Publications, Ltd. ; 2012
    In:  Key Engineering Materials Vol. 508 ( 2012-3), p. 61-64
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 508 ( 2012-3), p. 61-64
    Abstract: The CNTs/PMMA Nanocomposite Foams Are a Kind of Novel Multifunctional Foams which Have a Potential Application for Lightweight Conductive and EMI Shielding Materials. In this Work, the CNTs/PMMA Nanocomposite Foams with Different CNTs Contents from 1wt.% to 10wt.% Were Prepared at a Temperature Range of 50-140 °C with Supercritical Carbon Dioxide as Blowing Agent. The Results Suggest that the Fully Heterogeneous Nucleation Is Achieved due to the Contribution of Well-Dispersed CNTs in PMMA. The CNTs/PMMA Nanocomposite Foams Exhibit a Uniform Cell Distribution, and the Cell Density Is Two Orders of Magnitude Higher than that of PMMA Foams. The Cell Size and Cell Density of CNTs/PMMA Nanocomposite Foams Could Be Controlled by Adjusting the Foaming Process and CNTs Contents. It Is Also Suggested that the Foaming Process Plays an Important Role on the Cell Structure Rather than that of CNTs Content when it Is Higher than 1wt.%.
    Type of Medium: Online Resource
    ISSN: 1662-9795
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/KEM.508
    DOI: 10.4028/www.scientific.net/KEM.508.61
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2012
    detail.hit.zdb_id: 2073306-9
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  • 9
    Online Resource
    Online Resource
    Preparation of Tungsten-Epoxy Composites and FGMs with Density Gradient
    Trans Tech Publications, Ltd. ; 2009
    In:  Materials Science Forum Vol. 631-632 ( 2009-10), p. 461-464
    Details
    In: Materials Science Forum, Trans Tech Publications, Ltd., Vol. 631-632 ( 2009-10), p. 461-464
    Abstract: FGMs with density gradient are of great interest in field of dynamic high-pressure physics. In this paper, tungsten particles reinforced epoxy resin composites, and FGMs with density gradient were prepared by calendering technique. Microstructures of tungsten-epoxy composites with various tungsten contents were analyzed, and the density distribution of the FGMs was characterized. The results show that the distribution of tungsten particles in tungsten-epoxy composites is homogeneous, and the combination of tungsten particles with epoxy matrix is good. The density of tungsten-epoxy composites varies from 1.26gcm-3 to 4.0gcm-3, and the thickness of each layer is about 200μm. Tungsten-epoxy FGMs with density gradient were obtained by laminating thin layers of tungsten-epoxy composites with different tungsten contents. The highly enough bonding strength between these transition layers and good parallelism were achieved. The density distribution of the tungsten-epoxy FGMs can meet the demand of the power function equation of density and thickness.
    Type of Medium: Online Resource
    ISSN: 1662-9752
    URL: Issue
    URL: Article
    DOI: 10.4028/www.scientific.net/MSF.631-632
    DOI: 10.4028/www.scientific.net/MSF.631-632.461
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2009
    detail.hit.zdb_id: 2047372-2
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  • 10
    Online Resource
    Online Resource
    Preparation and Density Control of PMMA Microcellular Foams via Supercritical Carbon Dioxide Foaming
    Trans Tech Publications, Ltd. ; 2014
    In:  Key Engineering Materials Vol. 616 ( 2014-6), p. 242-246
    Details
    In: Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 616 ( 2014-6), p. 242-246
    Abstract: Microcellular polymeric foam is a new class of materials which has been widely used in many industries. The foaming of polymethyl metacrylate (PMMA) using supercritical carbon dioxide (ScCO 2 ) which is inexpensive and environmental friendly has been studied to better understand the foaming process. The pieces of PMMA are put into a saturation vessel of which temperature and pressure are kept constant. Supercritical carbon dioxide (ScCO 2 ) at temperature between 65 °C and 105 °C and pressure between 8 MPa and 16 MPa is used as a foaming agent. After saturation of carbon dioxide, rapid decompression of ScCO 2 saturated PMMA yields expanded microcellular foams. The densities of foamed PMMA materials are tested by true density analyzer, while the microstructures of a variety of density foamed PMMA materials are characterized by scaning electron microscopy (SEM). The cell size and cell density are calculated via image analysis. The effect of the process condition on the cell morphologies and mass density of the foam is investigated by considering the solubility of carbon dioxide in PMMA. The relationship between the mass density of foamed PMMA ( ρ ) and foaming temperature ( T ) and pressure ( P ) are respectively certained quantificationally.
    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.616.242
    Language: Unknown
    Publisher: Trans Tech Publications, Ltd.
    Publication Date: 2014
    detail.hit.zdb_id: 2073306-9
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