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  • Electronic Resource  (26)
  • 2005-2009  (26)
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  • Electronic Resource  (26)
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  • 1
    Electronic Resource
    Electronic Resource
    Study on High Performance Warm Compacted Fe-2Ni-2Cu-1Mo-1C Powder Metallurgy Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 1621-1624 
    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: Warm compacting and sintering behaviors of pre-mixed Fe-2Ni-2Cu-1Mo-1C powderswere studied. Results showed that green density increased with compacting temperature and thenfell slightly; the maximum green density was obtained at about 120°C. Green compact density andspring back effect of the pre-mixed powder increased gradually as the compacting pressureincreased. Sintered density first increased and then fell as the temperatures went up under differentsintering temperatures for 50 minutes, but the trends of sintering dilatation were first reduced andthen increased. Sintered density first reduced and then increased with the prolonged sintering timeat 1300°C, but the trends of dimension change after sintering were the very reverse. Tensile strength,elongation and hardness of the warm compacted Fe-2Ni-2Cu-1Mo-1C materials generally increasedas sintering temperature and sintering time went up
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.1621.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    A Study on Diffusion Wear of Machining Tool and Simulation by Diffusion Couple (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 813-816 
    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: By choosing appropriate annealing temperature and annealing time, diffusion couplesmade of aluminum bronze and tool materials were prepared to simulate the diffusion and phaseformation during the actual machining. These results were compared to those obtained from turningexperiments. In agreement with results obtained from diffusion couple experiments, all turningexperiments showed that major elements in both tool materials and workpiece diffused into theircounterparts. The diffusion of C away from the tool will reduce the tool strength. It is helpful to usediffusion couple results to comprehend the diffusion effect in the actual turning process
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.813.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Fabrication of WC-6Co-1.5Al (wt%) Hardmetal by High Energy Milling and Electrical Current Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 359-360 (Nov. 2007), p. 409-413 
    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: Ultrafine grain WC hardmetals were manufactured successfully from mixed powders ofnominal composition of WC-6Co-1.5Al(wt%). To manufacture bulk ultrafine grain WC alloys,nanocrystalline WC powders as precursor were prepared for sintering from the mixed commerciallyavailable powders by high energy milling of 15 h. Then the electrical current sintering process ofthe milled powders was further studied. Experimental results showed that the density, hardness andtransverse rupture strength of the sintered alloys reached 14.224 g/cm3, HRA 94 and 1660 MPa,respectively, by a appropriate coupling of pulse- and subsequent constant-current sintering and withthe total sintering time of 6 min. It seemed difficult to obtain desirable sintered hardmetal by asingle type of electric current sintering. However, the application of intensive pulse electric currentwas favorable to sintering, although it was difficult to achieve good WC alloys only by the pulseelectric current sintering. A higher density WC alloy could be prepared by enlarging the electriccurrent when only constant electric current was applied to sinter the milled powders. Unfortunately,the WC grains substantially coarsened concurrently so that the mechanical properties of the assintered alloy decreased obviously
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.359-360.409.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Near Full Density Nano Iron-Based Materials by Pulse Current Sintering (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 2143-2146 
    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: Constant current plus pulse current electrical sintering was introduced into the sinteringof a ball-milled nanocrystalline Fe-2Cu-2Ni-1Mo-0.8C mixed powder. Effect of pulse currentcharging time on the properties of sintered products was studied. Constant electric current sinteringwas also used for comparison. A nanostructured iron-based material was obtained within 4 minutesof sintering. It has a density of 7.7 g/cm3 (relative density of 98.7 %) with an average grain size(iron-matrix) of 58 nm and carbide particle size of less than 100 nm, a hardness of HRC 64 andtransverse rupture strength of 2004 MPa. When only pulsed electric current sintering was used witha sintering time of 5 min, a fine grained iron-base material with density of 7.74 g/cm3 (relativedensity of 99.2%), a hardness of HRC 65 and transverse rupture strength of 2045 MPa was obtained
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/55/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.353-358.2143.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Calcium Phosphate/Gypsum Composite Powders (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 280-283 (Feb. 2007), p. 1559-1562 
    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: Gypsum powders and calcium phosphate/gypsum powders were synthesized by wet method. The influences of the pH and temperature on the morphology of the gypsum crystal were studied by light microscopy. The effects of the initial calcium/phosphorus molar ratio and the pH of the solution on the microstructure and phase composition of the calcium phosphate/gypsum composite powders were studied by scanning electron microscopy and X-ray diffractometry. The results show that both temperature and pH value had influence on the crystal shape of gypsum and the pH value was the predominant parameter for the particle shape and phase composition of the composite powders
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/49/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.280-283.1559.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Pulse Electric Current Sintering of Iron-Base Powders Prepared by High Energy Milling (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 445-449 
    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: Fe-2Cu-2Ni-1Mo-0.8C (wt. pct) alloys were successfully fabricated from elemental mixedpowders by high energy milling and pulse electric current sintering, and the effects of milling timeand sintering parameters on the densification degree, microstructure, mechanical properties andfracture characteristic of sintered material were investigated. Results showed that with increasingmilling time, pulse electric current peak and sintering time, the density and transverse rupture strengthof sintered alloy were improved. However, higher pulse electric current peak and/or longer sinteringtime were unfavorable to the density and strength of sintered alloy, because of generating overhighsintering temperature. The density and transverse rupture strength of sintered alloy could reach 7.74[removed info]103 kg/m3 and 2231 MPa, respectively, and the corresponding fracture morphology wascharacterized as intergranular fracture
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.445.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Degradation Behavior of β-Ca〈sub〉3〈/sub〉 (PO〈sub〉4〈/sub〉)〈sub〉2〈/sub〉/β-Ca〈sub〉2〈/sub〉P〈sub〉2〈/sub〉O〈sub〉7〈/sub〉 Bioceramics (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 336-338 (Apr. 2007), p. 1650-1653 
    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: β-tricalcium phosphate (β-TCP) added with certain amounts of β-calcium pyrophosphate(β-CPP) was prepared. Degradation behavior of β-TCP/β-CPP ceramic was tested by soaking in Trissolution for 20d. The morphologies of composites before and after degradation were observed by SEM.The weight loss was tested after soaking in immersion solution. The results showed that the β-TCP/β-CPPceramic had great potential as a biodegradable bone substitute
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.336-338.1650.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Nonlinear Optical Behavior of Transparent Nanohybrids of Nanocrystalline TiO〈sub〉2〈/sub〉 in Poly(methyl methacrylate) Prepared by In Situ Sol-Gel Polymerization Technique (2005)
    s.l. ; Stafa-Zurich, Switzerland
    Journal of metastable and nanocrystalline materials Vol. 23 (Jan. 2005), p. 367-370 
    Details
    ISSN: 1422-6375
    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: Nanohybrid thin films consisting of nanocrystalline TiO2 particles in poly(methyl methacrylate)(PMMA) were successfully synthesized by in-situ sol-gel and polymerization assisted by spin coating. Using titanium isoproproxide (Ti-iP), methyl methacrylate (MMA) and 3-(trimethoxysily)propyl methacrylate (MSMA) as the starting materials, nanohybrids containing up to 60% Ti-iP inPMMA were realized. The resulting nanohybrid thin films coated on quartz substrates are optically transparent and demonstrate nonlinear optical behaviour, where their nonlinear absorption increases with the loading of Ti-iP in PMMA, as confirmed by Z-scan measurements. Using pump-probe technique, these thin films are shown to exhibit an ultrafast relaxation time of ~1.5 picosecond
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/43/transtech_doi~10.4028%252Fwww.scientific.net%252FJMNM.23.367.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Direct Joining of Acrylic Rubber to Cast Iron with Functional Nanofilm by Polymer Plating (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 315-316 (July 2006), p. 491-495 
    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 nanoscale functional thin film with the affinity to acrylic rubber was formed on thesurface of a high ductile spheroidal-graphite cast iron by means of polymer plating of6-diallylamino-1,3,5-triazine-2,4-dithiol monosodium salt. The direct joining of acrylic rubber to thecast iron was achieved with the functional nanofilm during curing. High peel strength adherend of therubber/cast iron was obtained with suitable film thickness and good film quality under curing at 453 Kfor 18 min. When the film thickness was 8.53 nm, peel strength of the adherend was high to 4.9kNm-1, and its broken-out section was rubber cohesive failure. The film thickness considerablyaffected peel strength and rubber coverage. Moreover, the current density of polymer plating hadlargely influence on mass and quality of thin film, thereby on joining property of acrylic rubber to thecast iron. The good joining property results from chemical bond within interfacial layer of acrylicrubber chain and reactive groups of nanofilm polymer-plated on the surface of cast iron
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.315-316.491.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Study on Fabrication of a Large Al-Cu-Mn Wheel with Indirect Squeeze Casting Process (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 532-533 (Dec. 2006), p. 353-356 
    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: The fabrication of a large Al-4.5wt%Cu-0.5wt%Mn wheel with 670mm diameter byindirect squeeze casting process was studied. The casting system including modified hydraulic pressand die structure was introduced, and the casting procedures was designed and described. Thefilling behavior of the casting process was simulated with software Flow3D. It was found that whileflowing from spoke to rim, turbulence flow of liquid melt in the vicinity of free surface was found,and that at the end of the filling, the unwanted solidification might occur. To reduce the turbulentflow and the unwanted solidification, a modified injection condition was proposed. The simulationresults with the modified injection indicated that the turbulence was prevented and the unwantedsolidification during the filling was reduced as well. The squeeze wheel castings were fabricatedwith the modified injection condition. Cross sections of the castings were checked. A number ofspecimens were obtained from different parts of the castings to evaluate microstructure of the wheel,and both high density and fine grain microstructures were found in the specimens. Mechanicalproperties of the tensile samples from the wheels with T5 heat treatment were measured. Theaverage tensile strength and elongation were 390 MPa and 10%, respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/14/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.532-533.353.pdf
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