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  • 1
    Electronic Resource
    Electronic Resource
    Laser-Assisted Growth of Superconducting MgB2 Films in an In Situ Annealing Process Using a Stoichiometric Target (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A superconducting MgB2 film with a superconducting transition temperature of ∼36 K was successfully prepared on an MgO substrate by pulsed-laser ablation from a stoichiometric MgB2 target. A multilayer deposition process involving interposed Mg-rich layers was performed at 200°C by controlling the laser energy density in order to maintain the correct stoichiometry, and followed by an in situ annealing process at temperature ranging from 700° to 900°C. It was found that smooth, fine-grained films with superconducting transition temperatures of 24–36 K could be obtained from in situ annealing of the as-deposited multilayer at 900°C without excess Mg addition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00465.x
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  • 2
    Electronic Resource
    Electronic Resource
    Formation of n–p–n structure on an insulating SrTiO3 single crystal using excimer laser irradiation (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 738-740 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An n–p–n semiconducting structure, similar to a p-type grain boundary between n-type grains in ceramics, was realized on an insulating SrTiO3 single crystal by using CuO diffusion and KrF excimer laser irradiation. P- and n-type semiconductivity was confirmed by Hall coefficient measurements for the laser-irradiated surface with and without CuO diffusion, respectively. Laser irradiation on the surface including a CuO-diffused line (1 μm width) gave an n–p–n structure, which showed nonlinear I–V characteristics with a nonlinear coefficient of 7. The present fabrication process is suggested to be effective for developing new oxide microelectronic devices as well as for fundamental study on grain-boundary functions of semiconducting ceramics. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123108
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  • 3
    Electronic Resource
    Electronic Resource
    Superconducting Characteristics of Polycrystalline Magnesium Diboride Ceramics Fabricated by a Spark Plasma Sintering Technique (2005)
    Oxford, UK : Blackwell Science Inc
    Journal of the American Ceramic Society 88 (2005), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Highly densified MgB2 superconductors were successfully fabricated using a spark plasma sintering (SPS) technique, and their superconductivity with respect to microstructural evolution was evaluated. Full densification with final density close to the theoretical density was achieved at a temperature of 1000°C within a total SPS processing time of 40 min. Both an MgB2 specimen sintered at 1000°C for 30 min and one sintered at 1050°C for 10 min exhibited a high critical transition temperature (Tc) similar to that of an MgB2 single crystal (39 K), and a very sharp superconducting transition width (ΔT) less than 0.5 K. In addition, high critical current densities (Jc) of 7.7 × 105 A/cm2 in a field of 0.6 T at 5 K and of 8.3 × 104 A/cm2 in a field of 0.09 T at 35 K were obtained. These excellent superconducting characteristics of the SPS-processed MgB2 are attributed to uniformly distributed secondary MgO phase nanoparticles and well-developed dislocations in the microstructure that may act effectively as extrinsic flux pinning sites, resulting in the strong pinning force showing a high Jc of 8.7 × 104 A/cm2 even in the condition of a field of 4 T at 5 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1551-2916.2005.00220.x
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  • 4
    Electronic Resource
    Electronic Resource
    Zirconia-Based Electrochemical NOx Sensors with Semiconducting Oxide Electrodes (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of the American Ceramic Society 87 (2004), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Electrochemical devices based on coupling an oxygen ionic conductor (Y2O3-stabilized ZrO2: YSZ) with semiconducting oxides as sensing electrodes were investigated. LaFeO3, a p-type semiconductor, and WO3, an n-type semiconductor, were chosen because of their known good NO2-sensing properties as resistive-type sensors. The entire sensors were wholly exposed to the same atmosphere. The electromotive force (EMF) was measured for different NO2 concentrations and at fixed temperature. The EMF values of both sensors increased in NO2 atmosphere with a fast response time. The best performance was observed around 450°C for LaFeO3-based and 650°C for WO3-based sensors. Moreover, the response of the LaFeO3-based sensors was found to be strongly affected by the grain size of the powder used for the preparation of the sensing electrode. The polarization curves of all sensors showed a nonlinearity; nevertheless an opposite behavior in the presence of NO2 gas was observed for the p- and n- type-based oxide sensors. The nonlinearity was attributed to the potential drop for LaFeO3 or increase for WO3 at the electrode interface. Amperometric measurements, performed at a fixed potential of 1 V, were found in accordance with polarization curves. The electrochemical impedance spectroscopy (EIS) analysis showed that the resistance and reactance at the electrolyte/electrode interface decreased (for LaFeO3)/increased (for WO3) on introduction of NO2 gas, because of the lowering/increasing of the electrode overvoltage.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2004.tb06335.x
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Filler Wire Composition on the Nd:YAG Laser Weldability of 6061 Aluminum Alloy (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 475-479 (Jan. 2005), p. 2591-2594 
    Details
    ISSN: 1662-9752
    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: 2 mm thick 6061-T6 aluminum alloy sheets were I square butt welded using 3kW Nd:YAG laser. Filler wires of 1 mm diameter, 5183A(Al-4wt.%Mg), 4043A(Al-5wt.%Si) and 4047A (Al-12wt.%Si) were used. The welds made with 4047A wire showed the lowest solidification cracking among the welds investigated. Abundant amount of Al-12wt.%Si eutectic which was observed at the grain boundaries of the 4047A wire feed welds was closely related with the reducedsolidification cracking susceptibility. Yield and tensile strength, and formability of the welds made with 4047A wire were improved compared to the welds made with other filler wires, which is attributed to the reduced cracking susceptibility in the welds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/09/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.475-479.2591.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Tensile Properties of Cast and Hot Isostatic Pressurized Ti-6Al-4Fe-xSi Alloys (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 449-452 (Mar. 2004), p. 689-692 
    Details
    ISSN: 1662-9752
    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: A new high strength titanium alloy system with low cost alloying elements, such as Al,Fe, has been recently developed. In present study the expensive V was replaced with Fe, and Si was added from 0 to 7.5wt.%. The effect of Fe and Si on the microstructure and tensile properties of Ti-6Al-4Fe-xSi (x=0, 0.1, 0.25, 0.5, 0.75wt.%) alloys was investigated. The room and high temperature mechanical properties of Ti-6Al-4Fe alloys were better than those of the Ti-6Al-4V. It was mainly due to the phase boundary strengthening at ambient and high temperature. The strength and elongation of the developed alloys depended upon the Si contents. The Si elements made the grain boundary and colony size fine, and increased the strength of the developed alloys by solid solution and precipitation hardening. The tensile strength variation with the Si contents at room temperature and 400°C, and at 450°C and 500°C showed a similar behavior, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/08/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.449-452.689.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    The Effect of Post Weld Heat Treatment on Mechanical Properties of Friction-Welded Alloy 718 and SNCRW Stainless Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 26-28 (Oct. 2007), p. 511-514 
    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 effect of post weld heat treatment on mechanical properties of friction welded Alloy718 and SNCRW was investigated. Friction welding tests were carried out at a constant rotation speedand pressure. Optimum friction condition was found to be the friction pressure of 25kg/cm2, frictiontime of 40sec, upset pressure of 80 kg/cm2, and dwell time of 5sec. After friction welding tests, postweld heat treatments were performed in the temperature range of 500-900°C for 8hrs in order toinvestigate the microstructure and mechanical properties of weld joint. Specimens with the post weldheat treatment at 720°C for 8hrs show optimal mechanical properties. Residual stress of post weldheat treated specimens was measured to weld joint in the same temperature range. After frictionwelding tests on samples with a diameter of 80mm, tensile properties of post-weld-heat-treated andnon-heat-treated samples were compared
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.26-28.511.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of Si Content on the Creep Properties of Ti-6Al-4Fe-xSi Alloys (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 1141-1146 
    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: Effect of silicon content on the creep properties of Ti-6Al-4Fe-xSi was studied. Creep resistance of Ti-6Al-4Fe-xSi alloys was superior to that of Ti-6Al-4V. Ti-6Al-4Fe-0.5Si alloy exhibited the highest rupture strength and creep resistance among the Ti-6Al-4Fe-xSi alloys investigated. The minimum creep rate of the alloys decreased with increasing silicon content up to 0.5wt.% and then it increased again when the silicon content was higher than 0.5wt.%. TiFe precipitates were formedmainly at the β phase area of Ti-6Al-4Fe-xSi alloys by consuming titanium and iron in β phase, when the alloys were thermally exposed at 500 and 600°C during the creep test. During the creep test, microvoids were induced at the TiFe/α phase interfaces and the cracks were formed along the TiFe/α phase interfaces by the coalescence of the voids. Those cracks were finally connected each other through the α phase
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.1141.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Microstructural Characterization of Fine-Grained Pb(Zr〈sub〉0.52〈/sub〉Ti〈sub〉0.48)〈/sub〉O〈sub〉3〈/sub〉 Ceramics Fabricated by a Spark Plasma Sintering (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 155-158 
    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: The dense Pb(Zr0.52Ti0.48)O3 (PZT) piezoelectric ceramics have been prepared at a lowtemperature by a spark plasma sintering (SPS) method without excess PbO addition and theirstructural features including domains were systematically investigated. The fine microstructureconsisting of submicrometer-sized grains as well as relative density reaching 99% was achieved bysintering at 950°C which is 400°C lower than that of pressureless sintering (PLS). Transmissionelectron microscopy (TEM) results confirmed that the sintered specimen contained very densedomain structures inside each grain, showing the nanoscaled single-domains even at the smallgrains (below 100 nm). The SPS-processed PZT exhibited better piezoelectric properties than thoseof the PLS-processed one, which is attributed to its fine-microstructural feature
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.155.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Tribological Properties of TiN/DLC Nanocomposite Coatings (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 385-388 
    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: The TiN/DLC nanocomposite coatings were grown on Si wafers using Ar/CH4/TDMAT(Ti[(CH3)2N]4N2) gas mixtures by r.f. plasma enhanced chemical vapor deposition. The slidingfriction tests were carried out using a ball-on-flat type tribometer. The different test parameters suchas applied loads, counterpart materials and environment were applied to understand the tribologicalbehavior in terms of friction and wear. The coatings provided a low friction coefficient and highwear resistance depending on the friction test conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.317-318.385.pdf
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