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  • 1975-1979  (4)
  • 1979  (4)
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Materialart
Erscheinungszeitraum
  • 1975-1979  (4)
Jahr
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  • 1
    Digitale Medien
    Digitale Medien
    The attack of Co-Cr alloys by Ar-SO2 atmospheres (1979)
    Springer
    Oxidation of metals 13 (1979), S. 457-474 
    Details
    ISSN: 1573-4889
    Schlagwort(e): cobalt-chromium alloys ; oxidation sulfidation ; conjoint attack
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Maschinenbau
    Notizen: Abstract Cobalt alloys containing up to 25% chromium have been exposed to Ar-10% SO2 atmospheres at temperatures between 600 and 1000° C. The results show that, although an increase in chromium content leads to a reduction in the reaction rate, even to negligible rates in the cases of the higher chromium contents, all of the alloys are eventually subjected to rapid attack at more or less longer times, depending on the chromium content. The mechanism of the reaction appears to involve the formation of a more or less protective oxide layer which is eventually penetrated by sulfur. The sulfur forms chromium sulfides at the metal-scale interface, removing the chromium from solution and causing an expansion that cracks the protective scale, allowing both the ingress of gas and the formation of rapidly growing cobalt compounds. The process occurs rapidly with Co-5% Cr alloys, whereas, only the initial sulfur penetration is observed with Co-25% Cr alloys during the time scale of the investigation. The penetration of sulfur is thought to occur as a molecular gas species permeating through the scale down physical defects.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00605110
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    2,2',4,4',6,6'-Hexachlorobiphenyl (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 259-262 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740879003241
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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    Artikel (Nationallizenzen)
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  • 3
    Digitale Medien
    Digitale Medien
    2-Azaadenosine hemihydrate (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 35 (1979), S. 973-976 
    Details
    ISSN: 1600-5740
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0567740879005318
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    The effect of magnetic ordering on superconducting pairing in some rare-earth compounds (1979)
    Springer
    Journal of low temperature physics 37 (1979), S. 389-396 
    Details
    ISSN: 1573-7357
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effect of Coqblin-Schrieffer-type interaction between conduction and rare-earth ion localized electrons on the superconducting order parameter δ of some ternary compounds is studied. A reentrant behavior of the order parameter is found. Superconductivity can be destroyed at two temperatures: at T c1 due to thermal pair breaking, and at T C2(〈 Tc1), when δ = Φ, Φ being related to magnetic ordering of rare-earth ions and spin polarization of conduction electrons.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00119196
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