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  • 2005-2009  (41)
  • 2008  (21)
  • 2006  (20)
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  • 2005-2009  (41)
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  • 1
    Electronic Resource
    Electronic Resource
    Effect of Deep Cryogenic Treatment on Carbide Precipitation and Mechanical Properties of Tool Steel (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 9-14 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: It is well known that the durability of tool steel could be improved by deep cryogenictreatment. It has been assumed that the increase of service life of tool steel caused by decrease ofretained austenite and/or by formation of nano-scale fine η-carbide. But the principles of deepcryogenic treatment remain unclear yet. In this research, to manifest the effect of deep cryogenictreatment on wear resistance, the specimen was emerged in liquid nitrogen for 20 hours for deepcryogenic treatment after austenitizing and the following tempering temperature was varied. Themicrostructure of specimens was observed using TEM and the mechanical properties and wearresistance were examined. As the tempering temperature increased, the carbides became larger andfine carbides were formed above certain temperature. In the case of deep cryogenic treatedspecimen, the number of carbides increased while the carbides size was decreased, furthermore, thefine carbide forming temperature was lowered also. It was considered that the deep cryogenictreatment increased the driving force for the nucleation of carbides. As tempering temperatureincreased, hardness decreased while wear resistance and impact energy increased. The deepcryogenic treated specimens showed this tendency more clearly. It was considered that the wearresistance is affected not only to the hardness but also to the precipitation of fine carbides, and thiscarbide evolution can be optimized through the deep cryogenic treatment
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/22/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.9.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    An Investigation of the Melt-Out and Heat Checking Phenomena in Surface Modified Hot Die Steel for Aluminum Die Casting (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 443-450 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: For hot die steel, failure is mostly caused by heat checking and melt-out on its surfaceswhich are in contact with molten metals. In the present research, resistances to melt-out and heatchecking of surface modified H13 hot die steels, such as gas nitriding(GN) andmicro-blasting(MB), were investigated. The evaluation of melt-out behavior was carried out bymeasuring the mean depth from the original surface after immersion. To examine the thermalfatigue resistance, a cyclic thermal shock system consisting of induction heating and water sprayquenching was constructed. The value of Lm is proposed as the index representing the susceptibilityto crack initiation and propagation. The melt-out depth was the lowest for the GN treated surface.MB-GN and MB-GN-MB treated specimens also showed good resistance to melt-out. In the case ofGN treatment, while the white layer was completely melted out, the diffusion layer still existedeven after immersion for 43 hours. This implies that nitriding significantly reduced the rate ofmelt-out. From the total crack number, it is seen that crack initiation was reduced to the extent ofhalf after surface treatment. This result means that the residual compressive stress and nitrided layerwere beneficial to crack initiation resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.443.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Surface Condition on Melt-Out of Die-Casting Mould (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 118 (Dec. 2006), p. 509-514 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: In order to understand the melt-out mechanism of H13 die casting mould material,microstructural investigation was conducted for the immersion-tested surface in Al-alloy melt. Thesurface condition of H13 tool steel was modified by varying nitriding conditions and by surfaceblasting. In particular, long-term behavior of melt-out phenomena during immersion testing of up to43 hours was focused in this article. It was observed that an ion-nitrided H13 surface showed higherresistance towards melt-out than a gas-nitrided or blasted surface. This was related to the surfacelayers that are normally formed by nitriding
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.118.509.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Preparation of Upconversion Luminescent NaYF〈sub〉4〈/sub〉 Co-Doped with Yb〈sup〉3+〈/sup〉/Er〈sup〉3+〈/sup〉 via Hydrothermal Synthesis (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 394-397 
    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: Hexagonal NaYF4 crystals co-doped with different concentration of Yb3+ and Er3+ ions weresynthesized via hydrothermal reaction route. The samples doped with 30mol% of Yb3+ and 1mol% of Er3+showed the highest upconversion efficiencies under 980nm excitation. Powder X-ray diffraction (XRD)analyses indicated that the samples were pure hexagonal phase. The morphology of the powder wasobserved by scanning electron microscopy (SEM). With the excitation of a 980nm diode laser, stronggreen emissions were obtained at 522, 530, 542 and 551nm in addition to weak red emission at 654nm.The green and red emissions were attributed to the transitions of 4S3/2, 2H11/2 → 4I15/2 and 4F9/2 → 4I15/2 ofEr3+ ion, respectively. The additions of Yb3+ ion as sensitizer can notably enhance the upconversionefficiencies from infra-red to visible. The upconversion mechanism of the emission for the samples wasalso discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.394.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of SnO Coatings on the Bond Strength between Titanium and Porcelain (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1268-1270 
    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 aim of this investigation is to study the effect of SnO coatings on the bond strengthbetween titanium and porcelain. The coatings were produced by sol-gel method and heat-treatment at300°C. Once the coatings have been formed on the titanium substrates, self-made porcelain was fused.The specimens with pre-oxidation before porcelain fused were set as control group. It was shown SnO gelformed completely at 300°C and was composed by SnO and SnO2 in the form of a uniform film. The bondstrength between titanium and porcelain of the specimens with SnO coatings was greater than those incontrol group statistically, which might prove that the coatings reduced the oxidation of titanium surfacein the porcelain fusing progress. EDS result showed almost all fractures between titanium and porcelainoccurred at the oxide layer. Si and Sn might attend the reaction at interface. It was concluded that the SnOcoatings produced in this study can improved the titanium-porcelain bond strength
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1268.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of the Sol-Gel Derived Bioactive Glass-Fibers (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1454-1457 
    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 sol-gel derived bioactive glass short fibers in the system CaO-P2O5-SiO2 was preparedusing air-spray method. SBF immersion test indicated that the fibers possessed satisfactory bioactivity.SEM, XRD, FTIR analysis revealed that the morphologies and bioactivity of the fibers could besignificantly influenced by the composition and viscosity of the solution. The fibers are very promisingbiomaterials for applications to bone restoration and tissue engineering as the bone defects fillers oradditives for strengthening of the biomedical polymers
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1454.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Phase Separation and Nanocrystal TiO〈sub〉2〈/sub〉 Formation in Na〈sub〉2〈/sub〉O-B〈sub〉2〈/sub〉O〈sub〉3〈/sub〉-SiO〈sub〉2〈/sub〉-TiO〈sub〉2〈/sub〉 System (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1419-1421 
    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 basic compositions of the samples were selected inside and outside of Na2O-B2O3-SiO2glass phase separation region, respectively. Nanocrystalline TiO2 was crystallized by melt-phaseseparation process. The results showed that the phase separation of Na2O-B2O3-SiO2-TiO2 glass systemwas advantaged to TiO2 nucleation and growth, and then the formation of the nanocrystalline. The mainmechanism of TiO2 crystallization is that the rich alkali-boron phase has the lower viscidity and higherparticles moving ability than that of parent phase glass. Therefore, the movement rate of TiO2 particle canbe promoted and TiO2 crystallization can be accelerated. Moreover, the formation of non-homogeneousnucleus situation and the centralization function of TiO2 have less contribution to TiO2 crystallization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1419.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Mechanical Properties and Microstructure of Partially Sintered Zirconia Ceramics (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 1252-1254 
    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: Partially sintered zirconia ceramics (PSZCs) for dental uses were prepared from zirconia nanopowdervia isostatic pressing and partially sintering. The open porosities, pore diameters, grain sizes andmechanical properties of the ceramics with different densities were studied. The results show that thepores formed in the PSZCs are all open pores, with a diameter distribution of 60nm~130nm and a grainsize distribution of 120~170nm. The machinability becomes worse when the density of PSZC is higherthan 75% of the theoretical density, so a ceramic named PSZC-70% with density of 70%TD was selectedas the target material. Its bending strength is 168 MPa and fracture toughness is 1.8 MPa·m1/2. A dentalrestoration framework can be obtained via machining the PSZC-70% on a dental CAD/CAM system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.1252.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Static and Dynamic Analysis of Carbon Nanotube Cantilever Based on Molecular Dynamics Simulation (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 375-376 (Mar. 2008), p. 631-635 
    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: Static and dynamic characteristic of carbon nanotube is analyzed by molecular dynamicsimulation. Static analysis show that maximum deflection of carbon nanotube appears at 0.033nmdistance from free end of cantilever. When the value of driving voltage is less, the flexibility ismore important, then the stiffness increase with the voltage increasing, and the collapse structure orhole appear on carbon nanobute. Under low pressure condition, deflection difference onequi-increase of pressure between no damping and damping simulation is larger than that on highpressure. The results of forced vibration indicate that system response consist of transient andsteady-state response. With steps of molecular dynamic simulation increasing, transient responsedisappears gradually, so system response includes only steady-state response, which is simpleharmonic vibration with the same frequency as excitation force. These results are in accord with theclassical vibration theory. Moreover they will provide theoretic foundation for designing ofnanostructure device
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.375-376.631.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Enhancement of Blue Emission via Upconversion in Solid-State Synthesized Hexagonal NaYF〈sub〉4〈/sub〉:Ln〈sup〉3+〈/sup〉 (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 368-372 (Feb. 2008), p. 398-401 
    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: Hexagonal NaYF4:Ln3+ (Ln3+=Yb3+ and Tm3+) was prepared via solid-state synthesis route.The synthesized powders were identified with X-ray diffraction patterns. Hexagonal phase was obtainedby heating the powders at 550ºC in reducing atmosphere, and the ions of Yb3+ and Tm3+ were completelyincorporated into the lattice of hexagonal NaYF4 in the doping concentration range. Microstructure of thephosphor was observed by scanning electron microscopy (SEM). Intense blue (1G4→3H6, 1D2→3F4) andweak red (1G4→3F4) upconversion emission of Tm3+ ions with the energy transferred from Yb3+ ions wereobserved in the phosphor excited with a 980nm continuous wave laser diode. The intensity of blueemission was effectively enhanced by suitable doping of Tm3+ and Yb3+ ions, and strongest blue emissionwas obtained with the concentration of 0.2mol% Tm3+ and 40mol% Yb3+ doped
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.368-372.398.pdf
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