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  • Electronic Resource  (3)
  • 1975-1979  (2)
  • 1965-1969  (1)
Material
  • Electronic Resource  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Chemical and petroleum engineering 13 (1977), S. 63-65 
    ISSN: 1573-8329
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 695-698 
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions Particle growth during the reduction of tungsten and molybdenum powders and the shrinkage kinetics of these powders depend on two processes taking place simultaneously, namely, partial melting and vaporization of surface layers of the dioxides of these metals. During high-temperature reduction (〉 1100°C), fine particles of tungsten and molybdenum dioxides are vaporized and redeposited on large particles; on the surface of the particles, a liquid phase may form, resulting in the generation of capillary forces which create a bond between separate particles. Melting of the oxides covering the surface of metallic tungsten and molybdenum particles promotes shrinkage during sintering, while conversely vaporization of the oxides inhibits the shrinkage of these metals.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Powder metallurgy and metal ceramics 14 (1975), S. 521-524 
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Conclusions 1. The more remote the process of hydrogen reduction of tungsten and molybdenum from equilibrium and the more unstable the intermediate phases, the greater is the self-acceleration of the reduction process resulting from particle comminution. 2. The hypothesis is advanced thatβ-W is a granulometric rather than a temperature modification of tungsten, which means that the existence ofβ-W directly depends on the particle size of the material.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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