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  • 1
    Electronic Resource
    Electronic Resource
    A study on Au/Ni/Au/Ge/Pd ohmic contact and its application to AlGaAs/GaAs heterojunction bipolar transistors (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 1854-1856 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An Au/Ni/Au/Ge/Pd ohmic contact system on n-type InGaAs was studied and applied to AlGaAs/GaAs heterojunction bipolar transistors (HBTs). Good ohmic behavior was achieved by rapid thermal annealing (RTA) at temperatures up to 400 °C, and the specific contact resistance was reduced to low-10−6 Ω cm2. However, by annealing at temperatures above 400 °C the characteristics were deteriorated by intermixing and phase reaction of the ohmic metals and InGaAs substrate. The HBTs using the Au/Ni/Au/Ge/Pd ohmic contact scheme showed reliable dc and rf performances with strong dependence on the ohmic contact, especially emitter ohmic contact with RTA temperature. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.119421
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  • 2
    Electronic Resource
    Electronic Resource
    Sliding Wear Characteristics and Fabrication of LPS-SIC Ceramic by Sintering Additives (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 1541-1544 
    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: Silicon carbide (SiC) materials have been extensively studied for high-temperaturecomponents in fusion blanket system and gas turbines, because they have excellent a hightemperaturemechanical properties, high thermal conductivity and wear resistance. However, thebrittle characteristics of SiC such as low strain-to fracture still impose a severe limitation on thepractical application of SiC materials. Therefore, a study of the sliding wear characteristics andfabrication of SiC ceramic by sintering temperature and additives are need. As the result of abrasion,the friction coefficient of the monolithic SiC sintered at 1800°C was the lowest, and the frictioncoefficient of that sintered at 1760°C was the highest. The monolithic SiC manufactured at 1800°Cshowed the highest hardness and the lowest friction coefficient. The friction coefficient of themonolithic SiC sintered by the SiO2 contents of 2wt% was the lowest, and the friction coefficientthat sintered by the SiO2 contents of 5wt% was the highest. 1800°C of sintering temperature and2wt% of SiO2 contents ware shown high hardness, low friction coefficient and wear loss comparewith other temperatures and SiO2 contents
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.1541.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    In Situ Deformation Behavior of Retained Austenite in TRIP Steel (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 408-412 (Aug. 2002), p. 571-576 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.408-412.571.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Transformation Behavior of Retained Austenite in Hydroformed TRIP Steel (2002)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 408-412 (Aug. 2002), p. 1341-1346 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/06/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.408-412.1341.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Formability of the Steel Sheet at the Intermediate Strain Rate (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 274-276 (Oct. 2004), p. 403-408 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.274-276.403.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    The Influence of Different Base Materials on Marginal Adaptation of Direct Class II Composite Resin Restorations (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 288-289 (June 2005), p. 481-484 
    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 purpose of present study was to evaluate the influence of different basematerials on the marginal integrity of posterior direct composite resin restorations.Conventional mesio-occluso-distal(MOD) cavity preparations, with margins in enamel and dentin, were prepared in 24 extracted human mandibular molars and randomly divided into four equal groups. One of three base materials (RMGI, compomer, flowable resin) was placed on the pulpal floors of the teeth of the groups. One group of teeth, which served as the control group, was not given any base material. Then, all teeth were restored with composite resin. The micromorphology of the tooth/restoration interfaces along the entire surfaces of therestorations was quantitatively analyzed using microscope at 150 magnifications immediately after finishing and after completion of thermo-mechanical stress. Marginal adaptation was assessed along the entire margin and % perfect margin (%PM) was calculated. The %PMs before and after thermo-mechanical stress in the groups were compared with Two- way ANOVA with Tukey test at the 95% confidence level. Before thermo-mechanical stress, there was no difference in marginal adaptation between groups. After the thermo-mechanical stress, the RMGI group showed the highest marginal adaptation rate among the tested groups. Incompomer and flowable resin groups, the marginal adaptation was lower after thermomechanical stresses than before the stress (p〈0.05)
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.288-289.481.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Evaluation of Hole Flangeability of Steel Sheet with Respect to the Hole Processing Condition (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 665-670 
    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: This paper is concerned with hole flangeability of steel sheet, which is evaluated byexperiment and finite element analysis with respect to the hole processing condition. The holeflangeability of a material as a forming limit needs to be verified to predict and prevent theundesirable fracture during a flanging process. Hole expanding tests are carried out to identify theeffect of hole processing conditions on the hole expanding ratio (HER), which is an indicator of thehole flangeability. Specimens with two different hole conditions are prepared: one is produced withpunching process; and the other is reamed after punching to get smoother hole surface. Experimentalresults show that the facture mechanism and the HER are quite different with respect to the holeconditions. Thorough investigation of those effects is carried out with tensile tests of a specimen withnotches. From the experiments, the fracture strain is obtained with different hole conditions and isused to determine the material constants of a new proposed ductile fracture criterion which is appliedto finite element analyses of the hole flanging process for prediction of the HER. The experimentalresults are confirmed and reevaluated by the finite element analysis with the ductile fracture criterion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.665.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Study on the Effect of Compressive Residual Stress on Fracture Toughness of Spring Steel (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 297-300 (Nov. 2005), p. 2423-2428 
    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: Recently, the steel parts used at the aerospace and automobile industries are required to be used lightweight parts. Therefore, used material steel have to be a high stress, which is an indispensable condition in this field. At the consideration of parts design, high hardness of the lightweight parts have an benefit of saving fuel and material. A high stress of metal has a point of difference according to the shape of design, external cyclic load and condition of vibration. Fatigue failure phenomena, which happen in metal, bring on danger in human life and property. Therefore, antifatigue failure technology take an important part of current industries. Currently, the shot peening is used for removing the defect from the surface of steel and improving the fatigue strength on surface. Therefore, this paper was investigated the effect on fracture toughness using shot peening which is improve the resistance of crack growth and crack expansion rate by fatigue that make a compressive residual stress on surface
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.297-300.2423.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Tribological Characteristics Manufactures SiC by Liquid Phase Sintered Method (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 1177-1180 
    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: SiC materials have excellent high temperature strength, low coefficient of thermalexpansion, good resistance to oxidation and good thermal and chemical stability etc. In this study,monolithic liquid phase sintered SiC (LPS-SiC) was made by hot pressing method with nano-SiCpowder an average particle size is 30nm and less. Alumina (Al2O3), yttria (Y2O3) and silica (SiO2)particles were used for sintering additives. To investigate effects of SiO2, Al2O3/Y2O3 compositionwas fixed and then ratios of SiO2 were changed as seven kinds. Materials have been sintered for 1hour at 1760[removed info], 1780[removed info] and 1800[removed info] under the pressure of 20MPa. The system of sintering additiveswhich affects a property of sintering as well as the influence depending on compositions of sinteringadditives were investigated by measurement of density, mechanical properties such as Vickershardness and sliding wear resistance were investigated to make sure of the optimum condition whichis about matrix of SiCf/SiC composites. The abrasion test condition applies to load of 20N at 100rpmfor 20min. Sintered density, abrasion property of fabricated LPS-SiC increased with increasing thesintering temperature. In case of LPS-SiC with low SiO2 content, has very excellent wear resistance
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.1177.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Dynamic Tensile Characteristics of TRIP-Type and DP-Type Sheets for an Auto-Body (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 340-341 (June 2007), p. 255-262 
    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: This paper investigates the dynamic tensile characteristics of TRIP600, TRIP800, DP600and DP800 at the range of strain rate from 0.003 to 200/s. The tensile test acquires stress−strain curvesand the strain rate sensitivity of each material. Experimental results show two important aspects forTRIP-type and DP-type sheets quantitatively: the flow stress increases as the strain rate increases; theelongation is not a monotonic function of the strain rate and increases at the same level of the strainrate even when the strain rate increases.In order to investigate the pre-strain effect for two types of metals at the high strain rate, TRIP600and DP600 were elongated with the pre-strain of 5 and 10% at the strain rate of 0.003/s. Then,dynamic tensile tests were carried out at the strain rate of 0.003, 1, 10 and 100/s. The resultsdemonstrate that the material properties of TRIP600 and DP600 are noticeably influenced by thepre-strain when the strain rate was over 1/s. The ultimate tensile strength as well as the yield stressincreases due to the pre-strain effect
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.340-341.255.pdf
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