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  • Articles  (3)
  • Ni3Al  (2)
  • 75.60L  (1)
  • Springer  (3)
  • American Ceramics Society
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (3)
  • Information Science and Librarianship
  • Economics
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  • Articles  (3)
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  • Springer  (3)
  • American Ceramics Society
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  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (3)
  • Information Science and Librarianship
  • Economics
  • Physics  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The dilution of silica in a NiZnCo spinel ferrite matrix (1996)
    Springer
    Applied physics 63 (1996), S. 453-459 
    Details
    ISSN: 1432-0630
    Keywords: 75.60E ; 75.60L ; 82.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Silica may dissolve up to about 0.05 wt% in an iron excess NiZnCo spinel matrix, affecting noticeably the magnetic properties at low and high values of the applied field. The initial permeability is reduced by about 50% with the addition of only 0.1 % SiO2, while the coercivity almost triples, without noticeable changes in porosity or grain distribution. The vacancy and Fe2+ content of the sintered material also show a considerable change. The energy associated to the transformation Fe3+ → Fe2+ for the samples without SiO2 was found to be 0.41–0.42 eV, while for the samples with SiO2 additions it decreased to 0.26 eV. The changes in magnetic properties are thought to be caused, more than because of the mentioned changes in ion distribution, by the stresses and defects created in the lattice due to the very small size of the Si4+ ion, which substitutes Fe3+ ions in tetrahedral sites. The transition Fe3+ → Fe2+ seems to take place exclusively in the octahedral sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01571673
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  • 2
    Electronic Resource
    Electronic Resource
    Oxidation behavior of a Ni3Al PM alloy (1997)
    Springer
    Oxidation of metals 48 (1997), S. 143-170 
    Details
    ISSN: 1573-4889
    Keywords: Ni3Al ; oxidation kinetics ; spallation ; scale roughening
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The oxidation behavior of a Ni3Al powder-metallurgical (PM) alloy doped with boron was investigated by means of discontinuous isothermal tests in the temperature range of 535° to 1020°C for exposures of up to 150 hr. The oxidation kinetics were characterized by a sharp decrease in the oxidation rate at about 730°C which is associated with a change in the oxidation mechanism. Below 730°C, the scale exhibited an outer NiO layer and an internal-oxidation zone consisting of a fine dispersion of alumina in a diluted Ni-Al solid solution. Between these two layers a very thin layer of nickel could be observed. Above 730°C, a three-layered scale was observed consisting of an outer NiO layer, an intermediate layer that depending on temperature consisted of a mixture of nickel and aluminum oxides or NiAl2O4, and an inner layer of Al2O3, which accounts for the higher oxidation resistance. Oxidation at the higher temperatures resulted in extensive void formation at the scale/metal interface which led to poorly adherent scales. It is worth noting that at the early oxidation stage the scale was characterized by planar interfaces. Roughening of the air/scale and, specially, the scale/metal interfaces after long exposures at the low-temperature range or after short times at higher temperatures could be related to the formation of the inner Al2O3 layer at the grain boundaries which favor oxygen penetration through the grain interior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01675266
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  • 3
    Electronic Resource
    Electronic Resource
    The Effect of Cr Implantation on the Isothermal-Oxidation Behavior of a Ni3Al PM Alloy (1999)
    Springer
    Oxidation of metals 51 (1999), S. 273-289 
    Details
    ISSN: 1573-4889
    Keywords: Cr-IMPLANTATION ; Ni3Al ; INTERMETALLICS ; ISOTHERMAL OXIDATION
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The isothermal-oxidation behavior ofnonimplanted and Cr-implanted Ni3Al obtainedby powder metallurgy (PM) was investigated at 585, 635,and 900°C for exposures up to 200 hr. For thenonimplanted material, the mass gain at 900°C was lower than thatfound at 635°C, whereas for the implanted materialthe oxidation rate increased with temperature, asexpected. Furthermore, Cr implantation significantlyreduced the oxidation rate with respect to thenonimplanted material, particularly at the lowertemperatures. Cross-sectional examination of theimplanted alloy revealed a heterogeneous attackcharacterized by a thin Al-rich oxide layer, occasionallydisrupted by isolated zones with a thicker three-layerscale, the morphology of which was similar to that ofthe nonimplanted alloy. The density of these zonesdecreased with increasing temperature. The beneficialeffect of Cr is associated with the rapid establishmentof a protective Al-rich oxide layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018822723455
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