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Spark Plasma (spark + plasma)

Distribution by Scientific Domains
Polymers and Materials Science80%

Terms modified by Spark Plasma

  • spark plasma Sinter
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  • spark plasma sintering
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  • spark plasma sintering technique
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    Selected Abstracts

    Spark Plasma Sintering as a Useful Technique to the Nanostructuration of Piezo-Ferroelectric Materials,

    ADVANCED ENGINEERING MATERIALS, Issue 8 2009
    Teresa Hungría
    Abstract This review gathers detail on the processing of piezo-ferroelectric ceramic materials by spark plasma sintering for the first time. The results reported here clearly indicate that it is a powerful technique and opens the possibility of processing ceramics with controlled sub-micron or even nanoscale grain sizes. [source]

    Synthesis and Thermoelectric Characterization of Bi2Te3 Nanoparticles

    ADVANCED FUNCTIONAL MATERIALS, Issue 21 2009
    Marcus Scheele
    Abstract Here, a novel synthesis for near monodisperse, sub-10,nm Bi2Te3 nanoparticles is reported. A new reduction route to bismuth nanoparticles is described, which are then applied as starting materials in the formation of rhombohedral Bi2Te3 nanoparticles. After ligand removal by a novel hydrazine hydrate etching procedure, the nanoparticle powder is spark plasma sintered to a pellet with preserved crystal grain sizes. Unlike previous works on the properties of Bi2Te3 nanoparticles, the full thermoelectric characterization of such sintered pellets shows a highly reduced thermal conductivity and the same electric conductivity as bulk n-type Bi2Te3. [source]

    Porous Ti-6Al-4V alloy fabricated by spark plasma sintering for biomimetic surface modification

    JOURNAL OF BIOMEDICAL MATERIALS RESEARCH, Issue 1 2004
    Masayuki Kon
    Abstract Porous compacts with both biological and biomechanical compatibilities and high strength were developed. Spherical powders of Ti-6Al-4V alloy, which were either as received or surface modified with the use of calcium ions by hydrothermal treatment (HTT), were fabricated by a spark plasma sintering process. The porous compacts of pure Ti were used as reference materials. Porosity was approximately 30%, and compressive strengths were 113 and 125 MPa for the as-received Ti alloy powders and those modified by the HTT process, respectively. The bending strength and elastic modulus of as-received Ti alloy powders were 128,178 MPa and 16,18 GPa, respectively. Each of the compacts was immersed in simulated body fluid (SBF). The amount of adsorption/precipitation of calcium phosphate through the compacts was measured by weight change and was observed by SEM. The compacts were covered with calcium phosphate after 2 weeks of immersion in SBF. The compacts of Ti alloy had plenty of precipitated apatite crystals, and modification by HTT accumulated more precipitation. Because calcium phosphate is a mineral component of bone, apatite, which is precipitated on the surface of the compacts, could adsorb proteins and/or drugs such as antibiotics. It is expected that a large amount of proteins and/or drugs could be impregnated when the porous compacts developed are used. © 2003 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 68B: 88,93, 2004 [source]

    Spark Plasma Sintering: An Easy Way to Make Infrared Transparent Glass,Ceramics

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 9 2010
    Gaelle Delaizir
    Infrared transparent glass,ceramics have been prepared in the system GeS2,Sb2S3,CsCl using spark plasma sintering in shorter times in comparison with conventional thermal treatments. The combined effects of pressure, time, and temperature allow the controlled crystallization of Cs-based crystals. The different glass,ceramics have been characterized by scanning electron microscopy and X-ray diffraction. The optical properties were also investigated. [source]

    Improved electroluminescence of spark-processed silicon by an aerosol-assisted technique,

    PHYSICA STATUS SOLIDI (A) APPLICATIONS AND MATERIALS SCIENCE, Issue 1 2003
    N. Shepherd
    Abstract The electroluminescence (EL) intensity (radiant flux) of spark-processed (sp) Si has been improved by one order of magnitude by introducing into the spark plasma an intimately mixed methanol/silicon particle suspension. This results in a smoother surface and an increased contact area to the semitransparent silver layer. As a consequence the light emitting region is substantially enhanced. Further, the device current increases by aerosol-assisted spark processing compared to conventional sp techniques. The EL spectra of sp-Si display maxima near 750 nm (1.7 eV) and 660 nm (1.9 eV) and a threshold wavelength for light emission at about 360 nm (3.2 eV). A mechanism for sp-induced EL of Si is proposed. [source]