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  • 1985-1989  (4)
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Material
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Effect of large boron additions to magnetically hard Fe-Pt alloys (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 2537-2540 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Magnetic properties were investigated for the ternary (Fe0.6Pt0.4)100−xBx and (Fe1−yPty)83B17 alloy ribbons prepared by the twin roll technique. Boron changes the compositions of the ordered FePt (γ1) phase, which coexists with Fe2B at various alloy compositions so that the actual Pt content of γ1 in the ternary alloy goes up with increasing boron content. Coercive force increase due to boron addition is remarkable, in particular at low Pt concentration. Annealing time to get high coercivity becomes much shorter by boron addition. iHc=5.6 kOe and 4πMs=7.8 kG were obtained in the (Fe0.65Pt0.35)83B17 ribbon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.341638
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Very low loss ultrathin Co-based amorphous ribbon cores (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 6050-6052 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ultrathin Co-based amorphous ribbons with a thickness of 6–10 μm were fabricated by a single roller quenching method in vacuum. The compositions of the alloys were zero magnetostrictive: Fe4.7Co70.3Si15B10 and (Fe0.05Co0.95)71(Si0.5B0.5)29. The ribbons obtained had good smoothness and dimensional uniformity. The core loss of toroidal samples 15 mm in diameter was measured after annealing. The loss decreased with decreasing ribbon thickness. In the case of 6.4-μm-thick (Fe,Co)71(Si,B)29 amorphous ribbon, the values at 100 kHz and 1 MHz were 40 mW/cm3 and 1.8 W/cm3 for Bm=0.1 T, respectively. The former was 1/4 that of Mn-Zn ferrites or 1/2 that of 5-μm-thick Supermalloy tape wound core loss. The latter was (2)/(3) that of 5-μm Supermalloy tape wound core loss. In addition, the initial permeability beyond 100 kHz was also markedly improved by thickness reduction. The values of 6.4-μm-thick (Fe,Co)71(Si,B)29 ribbon measured at 1 and 10 MHz were about 7000 and 1000 for Hm=2 mOe, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342151
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetostriction and magnetic core loss at high frequency in amorphous Fe-based alloys (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3572-3574 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coercive force Hc and core loss at high frequency f up to 100 kHz were investigated for amorphous Fe-based alloys with various magnetostrictions. Log Hc is shown to be proportional to log f. Magnetic core loss at high frequency for annealed toroidal cores of amorphous Fe-based alloys was shown to be significantly dependent on magnetostriction. Core loss and rectangular ratio in a dc B-H loop are influenced by the number of amorphous tape winding turns N, which is interpreted in terms of surface oxidation of the toroidal core. Very low core losses of 195 mW/cm3 and 350 mW/cm3 (3 kG, 50 kHz) were attained for a ring and a toroidal core, respectively, of the amorphous (Fe0.82Ni0.10Nb0.08)83Si5B12 alloy with a low magnetostriction of 5×10−6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335010
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    A three-dimensional deformation analysis of workpieces grasped by chucks (1989)
    Springer
    Experimental mechanics 29 (1989), S. 443-447 
    Details
    ISSN: 1741-2765
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract This paper deals with a three-dimensional deformation analysis of workpieces mounted in fixtures, where the workpieces are finite solid cylinders. The analysis is carried out using a three-dimensional theory of elasticity, where clamping forces caused by chucks are regarded as an axi-asymmetrical load. In numerical calculations, the effects of a number of chuck jaws, the diameter of workpieces and the grasping area on the roundness of the workpieces are shown. For verification, a three-dimensional photoelastic experiment is performed. In addition, the deformation of workpieces is measured by an electric comparator and by holography. The analytical results are satisfactorily consistent with the experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02323865
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    Paper (German National Licenses)
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