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  • 2005-2009  (290)
  • 1985-1989  (50)
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  • 1
    Electronic Resource
    Electronic Resource
    Synthesis of Nano-Sized Co-Sb Compounds through Solvothermal Routes (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 136 (Feb. 2008), p. 57-62 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Skutterudite materials have received great attention because their promising propertiesfor thermoelectric (TE) applications. Among the family of skutterudites, CoSb3 has been intensivelyinvestigated due to its large electrical conductivity and Seebeck coefficient. However, its thermalconductivity is too high to make it an effective TE material. Nanostructuring of CoSb3 has thedesirable effects of reducing its lattice thermal conductivity as the point imperfections or grainboundaries can scatter phonons (heat carrier) more effectively than electrons (charge carrier). In thisstudy, nanostructured CoSb3 was synthesized by solvothermal routes using CoCl2·6H2O and SbCl3as precursors dissolved in anhydrous ethanol with the reaction temperature kept at 240°C. Inaddition to the CoSb3 phase, other Co-Sb compounds were also formed during the reaction process.In this paper, we investigated the effects of processing parameters, such as concentration ofCoCl2·6H2O, SbCl3 and NaBH4 in ethanol and thermal duration of solvothermal synthesis, on theyield of CoSb3 phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.136.57.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Real-Time Simulation Measurement System for Transient Temperature of Impacting Droplet Based on the Virtual Instrument (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 1015-1018 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The quality of coatings is directly influenced by the flattening and solidification of manyindividual molten droplets in plasma spray forming, so many properties such as thermal, electrical,mechanical etc are strongly linked to the real contact between the “piled-up” splats. The research onthe transient temperature of impacting droplets and the heat transfer between droplets and substrateplays an important role in improving the quality of coatings. Because of complexity and high cost oftemperature measurement systems for molten droplet during flattening in plasma spray forming atpresent, this paper presents a new kind of simulation measurement system for transient temperature ofspray droplets when impacting on substrate based on LabVIEW, which could display the real-timechanges of the temperature by waveform graph. Finally, the experiments were carried out on Pb-Snalloy molten droplets to reveal the close connection between the impacting droplets temperaturechanges and the coatings quality, and the heat transfer between droplets and substrate was discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.1015.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Theoretical Analysis and Simulation of the Effect of Vibration Amplitude on Cutting Force in Precision Ultrasonic Vibration Cutting (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 329 (Jan. 2007), p. 693-698 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Precision ultrasonic vibration cutting is a promising technology in field of precision andultra-precision machining. It is a kind of the pulsing cutting process with a constant vibrationfrequency and sine-wave amplitude of vibration. In this article, a rational model of cutting force invibration cutting is established, and the vibration cutting mechanism is analyzed. Specially, by themethod of numerical simulation, the effect regulation of amplitude of vibration on cutting force istheoretically discussed for the first time in precision vibration cutting. And the relationship betweencutting parameters and cutting force is probed into on the different cutting conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.329.693.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Application of RBF Network for Forecasting Characteristics of In-Flight Particles by Plasma Spraying (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 985-988 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: The main factors that influence the deposition efficiency and forming quality are the stateof in-flight particles, which are directly effected by process parameter during plasma spray forming.In this study, plasma spraying of ZrO2 powder was employed according to the method of orthogonalexperiments, and the relationship between spray parameters and characteristics of in-flight particles,which were monitored by an optical monitoring system of CCD camera, were investigated. Radialbasis function (RBF) neural network model had been designed to forecast the temperature andvelocity of in-flight particles, and optimized spray parameter. The comparison of the simulationswith the experimental results shows the validity of the model
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.985.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Improvement of Microstructural Controllability of Cellular Ceramic for Multifunctional Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 944-947 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: By modifying the sequences in preparation of aqueous ceramic slurries, starch wassuccessfully employed to improve the microstructural controllability of alumina foams fabricatedthrough protein coagulation casting technique. Open porosity was increased and the uniformdistribution of microstructures was improved by the dual functions of starch as pore former and wetfoam stabilizer. The viscosity of slurry was affected by the increasing amount of starch additive dueto the total solid loading increase and the water uptake of starch. A well controlled pore structurewill benefit multifunctional applications of these porous foams
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/41/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.944.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Iron-doped semi-insulating InP grown by chemical beam epitaxy (1989)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 54 (1989), S. 2336-2338 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have prepared Fe-doped InP epilayers by chemical beam epitaxy using a thermal atomic Fe beam. Epilayers having high resistivities ((approximately-greater-than)107 Ω cm) were obtained over a wide range of Fe concentrations. Resistivities as high as 1.3×108 Ω cm have been obtained. Such resistivity is almost equal to the theoretical value of 1.37×108 Ω cm that we estimate for intrinsic InP. The current-voltage characteristics exhibit both an ohmic and a space-charge-limited regime, and are consistent with the theory of single-carrier injection into a trap-free insulator. Pinning of the Fermi level near midgap by Fe-related deep levels is the mechanism by which the epilayer is made highly resistive. At room temperature, these traps are apparently deep enough that the carrier emission rate is negligible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.101120
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  • 7
    Electronic Resource
    Electronic Resource
    Quantum shift of the optical absorption edge in ultrathin amorphous hydrogenated germanium (1987)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 51 (1987), S. 264-266 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical absorption coefficient in ultrathin (∼10 A(ring)) hydrogenated amorphous germanium (a-Ge:H) layers deposited on hydrogenated amorphous silicon layers was determined by in situ reflectivity measurements. The decrease in the absorption coefficient in the ultrathin a-Ge:H layers, compared to that of thick films, is explained by an upward shift in the conduction band edge due to quantum confinement of electrons with effective mass of 0.4m0.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.98468
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of sputtering parameters on the magnetic properties of Mo-Permalloy (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5670-5672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sputtered Mo-Permalloy thin film is expected to possess great potentiality in soft magnetic properties which can be realized chiefly by controlling sputtering conditions. The effects of sputtering parameters, such as argon pressure, bias voltage, and preheating temperature, on the magnetic properties, of FeNiMo sputtered films have been investigated. The magnetic anisotropy field Hk was found to decrease with the raising preheating temperature while coercivity Hc presented the contrary trend. High effective permeability can be acquired at low argon pressure, adequate preheating temperature, and bias voltage. Close relationships among effective permeability, anisotropy field, magnetostriction coefficient, and half-height width Δθ50 were found. Annealing is available for increasing effective permeability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342269
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  • 9
    Electronic Resource
    Electronic Resource
    The Effect of Post-Treatment on the Mechanical Behavior of Plasma Sprayed HA Coating (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 284-286 (Apr. 2005), p. 337-340 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Plasma-sprayed hydroxyapatite coating on metal substrate has been prepared, two kinds of post-treatment methods have been used: (1) Heating in air at 650°C for 30 min, (2) Heating in water vapor at 125°C, 0.15Mpa for 6 hours. XRD showed that the nanocrystals of HA coating increased after water vapor treated. The interfacial tensiles strength between HA and the substrate were 45.0±1.82MPa, 39.1±1.27MPa and 30.3±1.61MPa for as-received coatings, water vaportreated coatings and heated in air coatings respectively. After 3 months implant in dogs limbs, the push-out strength between implants and bone were 11.27±2.71 MPa, 11.63±3.11MPa, 23.92± 2.01MPa and 18.8±1.82 MPa for pure Ti implants, as-received coating implants, water vapor treated implants and heated in air implants respectively. The results showed that the water vapor post treated HA coating have better mechanical behavior in vitro and in vivo
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.284-286.337.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    The Mechanical Behavior of Water Vapor-Treated HA Coating Produced by Plasma Spraying Technique (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 355-358 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Plasma-sprayed hydroxyapatite coating on metal substrate was prepared. Two kind of post-treatment methods were been applied to the coating, treatment in air at 650°C for 30 min and treatment in water vapor at 125°C with a pressure of 0.15MPa for 6 hours. XRD showed that the HA nanocrystals increased after water vapor treatment. The interfacial tensile bond strength between HA and substrate was 45.0±1.82MPa, 39.1±1.27MPa and 30.3±1.61MPa for as-received coatings, watervapor treated coatings and heated in air coatings, respectively. 3 months after implantation in dogs limbs, the push-out strength between implants and bone was 11.27±2.71MPa, 11.63±3.11MPa, 23.92± 2.01MPa and 18.8± 1.82MPa for pure Ti implants, as-received coating implants, water vapor treated implants and heated in air implants, respectively. The results showed that the post-water vapor treated HA coating have better mechanical behavior in vitro and in vivo
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.355.pdf
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