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  • 2005-2009  (6)
  • 1980-1984
  • 2007  (4)
  • 2006  (2)
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  • 2005-2009  (6)
  • 1980-1984
Year
  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 171-176 
    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: In this study, the influences of carbides and alloy additives on ground surfacecharacteristics of several high Chromium (Cr) steels and abrasive grains of working surface werediscussed. In the grinding using metal bonded CBN wheel, almost constant values in groundsurface roughness and high grinding ratio were shown. 5% Cr steel with Vanadium, 8% Cr steeland 10% Cr steel showed a rougher surface than Cr steels with 3%, 4% and 5% due to the carbideinclusion. The grinding ratio of 5%Cr steel could be raised considerably by adding sulfur to it
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 261-264 
    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 fundamental experiment of the grinding of the stainless steel using the metal bondedCBN wheel which was excellent in wear resistance was conducted. The most appropriate grindingconditions were obtained by clarifying wear process of grinding wheel and finished ground surfacequality. When grinding was carried out up to stock removal 7000mm3/mm, radial wear of grindingwheel %R is 3μm and surface roughness Rz was 0.5μm or less. The grinding ratio Gr becomesabout 3000, and long life grinding with little change of surface roughness was possible
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 24-25 (Sept. 2007), p. 65-70 
    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: High density and isotropic poreless structure of Glass-like-carbon makes it practicallyused for fuel cells of space-shuttles and hard disk substrate etc. Glass-like-carbon is one of the newmaterials which attract attention, but it is so hard and brittle that precise machining of this materialis difficult. Surface grinding and slicing were performed to collect the fundamental data of precisemachining. The main results obtained in this study are as follows. (1) The transition from brittlemode to ductile mode in surface grinding occurs at a grain mesh size between #5000 and #3000.(2) The maximum grain depth of cut ‘dg’ necessary for ductile mode grinding is 0.021-0.006 mm orless. (3) When it is being sliced, the kerf width of the #1000 grinding wheel becomes wider thanthat of the #2000 grinding wheel because of the fact that the material removal capability of the#1000 grinding wheel is bigger than that of the #2000 grinding wheel. (4) It is extremely effectiveto use the fine grinding wheel, since the Young's modulus of glass-like-carbon is considerably lowand eventually causes compression transformation
    Type of Medium: Electronic Resource
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  • 4
    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: Three-dimensional zinc mapping based on X-ray K-edge scanning has been performed.By microtomographies with energies above and below the K-absorption edges of the elements, theconcentration distribution of the elements is evaluated during in-situ experiments, respectively. It isfound that the Zn concentration distribution during the heat treatment was changed inside the cellwall of the aluminum foams and it has been homogenized. Also several precipitated phasetransformation can be three-dimensionally visualized by the CT-method tuning X-ray energies
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 317-318 (Aug. 2006), p. 11-14 
    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 Master Sintering Curve (MSC) is quite useful for analyzing the shrinkage behavior ofceramics. It is possible to compare shrinkage behavior using MSCs that are obtained from different firingprofiles. In this study, shrinkage behavior during sintering of green bodies of several kinds of Al2O3based ceramics were evaluated, using an electric furnace equipped with a dilatometer to be controlledbased on the MSC theory. Although all of the samples shrank monotonically, shrinkage behaviordepended on the additive and heating rate. The MSC theory was applied to analyze shrinkage behavior.As a result, a different MSC could be obtained in Al2O3 with and without the addition of MgO. In thepure Al2O3, a single MSC could be obtained from shrinkage curves by firing at a heating rate of7.5-20oC/min, though the shrinkage curve at a heating rate of 3-5oC/min did not correspond with theMSC. In contrast, shrinkage curves at heating rate of 5-20oC/min were converged in the case of the MgOdoped Al2O3 to obtain a unique MSC independent of firing profile. Apparent activation energy forsintering was estimated as 555 kJ/mol in the pure Al2O3 and 880 kJ/mol in the MgO doped Al2O3. Thefiring profile to obtain a requested sintering shrinkage curve was predicted from the resultant MSC. Acomparison between the predicted and the experimental shrinkage curves, showed good consistency,thus confirming that it is possible to control shrinkage behavior using the MSC
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1662-0356
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Natural Sciences in General , Technology
    Notes: Co-Fe-B/MgO/Co-Fe-B magnetic tunnel junctions were fabricated using UHV magnetronsputtering. Magnetoresistance and spin-transfer switching properties were investigated as a functionof Co-Fe-B free layer thickness, between 1.5 nm and 3 nm. The intrinsic switching current andthe thermal stability were derived from the pulse duration dependence of the switching current,analyzed based on the thermally activated switching model. Both switching currents, correspondingto parallel (P) to antiparallel (AP) (Ic0+) and AP to P (Ic0–) magnetization reversal, were foundto be roughly proportional to the free layer thickness. The averaged intrinsic switching currentdensity Jc0av = (Ic0+–Ic0–)/(2A) (where A is the cell area) was in the range of 1–2×107 A/cm2. Theexperimental values of Jc0±agreed with theoretical values, determined taking into account the spintransferefficiency for the case of magnetic tunnel junction. The thermal stability of the P and APstates was different, but roughly proportional to the free layer thickness in both cases. We attributethis difference to a disparity in the net magnetic field acting on the free layer magnetization in the Pand AP states. The average of the thermal stability in the two states varied from 30 to 60 when thefree layer thickness was increased. According to our findings, to guarantee the non-volatility of anMRAM device for about 10 years, the Co-Fe-B free layer should be thicker than 2 nm
    Type of Medium: Electronic Resource
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