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  • 2005-2009  (21)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Microstructure and Properties of Brazing Joint between YG8 Cemented Carbide and A3 Steel (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 127 (Sept. 2007), p. 265-270 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: YG8 cemented carbide and A3 steel were jointed by induction brazing using filler alloysof CuZnMn and CuZnMnCo respectively. Microstructure of the joints was analyzed by means ofSEM. Shear strength of the brazing joint was measured. The results indicated that the bond strengthof the joints which were brazed using the two kinds of filler alloys was all above 200MPa, and allthe fractures took place in the cemented carbide near the interface, indicating that there was a largeresidual stress near the interface. In order to reduce residual stress, the joints were heat treated afterbrazing. The bond strength of the joint was increased obviously after these treatments. At the sametime, the brazing joints were all fractured at the interface between cemented carbide and filler alloy
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/24/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.127.265.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Modeling and Simulation of Hydraulic Fracturing Propagation in Permeable Reservoirs (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 383-386 
    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: Numerical simulation of hydraulic fracturing propagations in the permeable reservoirs wascarried out with the finite element analysis software (ABAQUS). A model of coupling the stressequilibrium and fluid continuity equations was proposed and implemented. The nonuniform of sinkpore pressure on the fracture surfaces which changes associated with the propagation of fracture wasdescribed by a self-developed subroutine through the FLOW in ABAQUS. Samples under differentconditions were conducted for studying the rules of the propagation of hydraulic fracturing. Theresults show that the permeability at the fracture tip is more serious than any other places of thefracture face. The model also illustrates that the fracture geometry is mainly determined by theminimal in-situ stress. The model can be used to simulate the effects of hydraulic fracturing pressuresand injection rates on fracture propagation. The results are of much significance for the design ofhydraulic fracturing treatments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.383.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochromic and Electrochemical Properties of Nickel Oxide Thin Films Prepared by a Modified Sol-Gel Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 625-629 
    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: NiO thin films were prepared on ITO glass by a modified sol-gel method in combinationwith a following annealing process. The XRD results show that the film annealed at 280 °C isamorphous, while the films annealed at and above 300 °C are cubic NiO phase. The electrochromicperformances of the annealed films were characterized by means of UV–vis spectroscopy andcyclic voltammetry (CV) measurements. The film annealed at 280 °C exhibits a noticeableelectrochromism with a variation of transmittance up to 76 % at 550 nm. The cyclic voltammetry(CV) measurements reveal that the film annealed at higher temperature has better electrochemicalreversibility
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.625.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Study on the Behavior of the Cast-Iron Bonded Grinding Wheel to Machining Properties of Hard and Brittle Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 229-232 
    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: Tungsten carbide which is a hard and brittle material was ground by cast-iron bondeddiamond wheel with ELID (Electrolytic In-Process Dressing) technique, for the purpose of gettinghigh efficiency, super-precision machining. Three kinds of cast-iron bonded diamond wheels withdifferent grain size were adopted to get different grinding efficiency and surface quality ofworkpieces. The grinding properties of cast-iron bonded grinding wheels with different grain sizeand the ground surface quality of tungsten carbide are discussed in this paper. The experiment resultsindicate that, under the same feeding amount, the grinding efficiency of the wheel with bigger grainsize is higher, and it could make the dimension accuracy of the workpiece controllable, but thewheel with smaller grain size could get better ground surface quality. The two grinding phases aredecided by the ratio between the size of abrasive grain and the thickness of the oxide layer on thegrinding wheel
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.24-25.229.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Artificial Nano-Scale Precipitates for Flux Pinning in YBa〈sub〉2〈/sub〉Cu〈sub〉3〈/sub〉O〈sub〉7-δ〈/sub〉 Thin Films and Coated Conductors (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1865-1870 
    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: By controlling pulse number of laser ablation, we prepared a series of quasi-multilayers ofYBa2Cu3O7-δ/M (M=incomplete oxide layer) namely 70×(40/n) (n = 2, 5, 10 and 20, pulse number ofM) which were characterised with nano-scale precipitates. While the texture properties of Y123inside qusi-multilayer hardly change, its Tc appeared much different depending on the doping level ofM. X-ray θ-2θ scanning and pole figures indicated that the different growth-controlled precipitatesoccured inside Y123 films. In the case of M=YSZ (Yttria Stabilized Zirconia), nanosized perovskiteprecipitates of BaZrO3 formed as a result of solid state reaction of YSZ with Y123, leading to Tcobviously decreasing with increasing of n. In the case of M=Y2O3, however, Tc did not decrease somuch at the studied range of n due to no solid state reaction mentioned above. Magneto-transport andfield angular dependence showed that the critical current density in films with lower doping content(such as n = 2) was improved in large ranges of field and temperature, suggesting tailorableenhancement and anisotropy of flux pinning force
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1865.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    Study on Fracture Behavior of γ-TiAl Based Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1437-1442 
    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: Fracture behavior of fully lamellar (FL) and duplex phase (DP) TiAl alloys is reported inthis paper. It was found that the inverse behavior of coarse FL TiAl alloy showing inferior tensileproperties but superior fracture toughness resulted from the different fracture mechanisms of thesetwo types’ tests. In tensile specimens, the final fracture happened at a section that was most heavilydamaged by the accumulation of large interlamellar microcracks and arbitrarily located within thegauge-limited volume. In 3PB notch specimens, the propagation of the main crack was constrainedwithin a narrow strip nearby the centerline where the normal stress was the highest. Large lamellargrains caused serious damage in tensile tested specimens. However multi-oriented large lamellargrains formed seriously bifurcated crack tips, which made the crack propagation more difficult in 3PBnotched specimen. The main mechanisms of toughening in FL specimens were the deflection of maincrack, bifurcation and blunting of crack tip and formation of a diffuse zone of microcracks. Thesephenomena reduced the driving force for crack extending and then increased the fracture toughness
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1437.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A Novel Canning Technology for Forging of Gamma-TiAl Alloys (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 1421-1426 
    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 novel canning technology to forge gamma-TiAl alloys was developed at the BTUCottbus. A TiAl specimen was encapsulated with multilayer stainless steel foil and glass. The steelfoil layers prevented the heat loss through radiation and the glass layer reduced the temperaturedecrease through conduction. First, the effect of steel foil on the cooling rate was investigated.Cooling curves were recorded for TiAl specimens without steel foil layer, with 1, 2, 3 and 4 layers ofsteel foil, as well as with 3 coated steel foil layers, respectively. While the unprotected specimencooled from 1200 °C to 1100 °C within 12 s, the specimen with 3 coated steel foil layers needed 52 sfor the same temperature decrease. The efficiency of the glass layer was examined with forging ofsteel specimens. The cooling rate during forging of the specimen with a glass layer was only half ofthat without a glass layer. Based on the results, Ti-45Al-0.5Mo-0.5Cu-0.2Si specimens, canned withsteel foil and glass, were successfully forged at strain rates of 0.1 s-1 and 0.04 s-1 with warm dies whichwere heated to 500 °C. Visual and metallographic examinations revealed no cracks, pores ormicropores. The microstructures are fine-equiaxed grains
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.1421.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    A New Bulk Deformation Method – Cyclic Extrusion (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 546-549 (May 2007), p. 2293-2300 
    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: Cyclic extrusion is a new bulk deformation method. It consists of two steps. In the first stepa part of the work piece will be indirectly extruded. In the second step the extruded part will bebackwards pressed into the bulk again so that the original shape of the work piece is retained. Similarto ECAP, cyclic extrusion can be repeated many times without shape change. On the other hand,cyclic extrusion can be applied locally on a work piece so that local grain refining or work hardeningis possible. Magnesium alloy AZ31 was cyclically extruded at 400 °C with different tools. The grainsize was refined from 800 +m to 15 +m. The local grain refining in the surface zone with cyclicextrusion improved the rollability of cast AZ31. Pure aluminium specimens were cyclically extrudedup to 2.5 times, which corresponds to a deformation degree of -7. The microstructure changes wereexamined with EBSD
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.546-549.2293.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Diffusion and Electroluminescence Studies of Low Temperature Diffusion of Boron in 3C-SiC (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 600-603 (Sept. 2008), p. 457-460 
    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 characteristics of boron diffusion in 3C-SiC at low temperature have been measuredusing spreading resistance technique and electroluminescence spectroscopy. The coefficient of borondiffusion in the temperature range of 1150 –1250°С has been found to be about 5.5 x 10-11–5.0 x 10-10cm2/sec and the activation energy of boron diffusion was determined to be about 0.9 –1.15 eV.Electroluminescence spectra of 3C-SiC p-n junction structures showed peaks at 750 and 630 nm dueto growth defects and carbon-silicon divacancies respectively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/20/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.600-603.457.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Microstructure of Brazing Joint of Silicon Nitride (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 539-543 (Mar. 2007), p. 4048-4052 
    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: Si3N4 and 40CrMo steel was joined using Ag-Cu-Ti-Pd brazing filler. Microstructure ofthe joint and bonding interface was studied by SEM and EDS, and the phase structure was analyzedby XRD. The results indicate that reaction layers at ceramic/ filler alloy and filler alloy/steelinterfaces are formed. There is a reaction layer containing TiN and Ti5Si3 between ceramic and filleralloy, while the reaction layer between filler alloy and steel is composed of Fe-Ti compound. Themiddle part of the joint is an eutectic structure composed of Ag-riched and Cu-riched solid solutions.With the increase of the brazing temperature, the thickness of the joint seem decrease, the thickness ofthe reaction layer between Si3N4 and filler alloy increases and then decreases, and the thickness ofthe reaction layer between filler alloy and steel increases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/15/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.539-543.4048.pdf
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