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  • 1
    Electronic Resource
    Electronic Resource
    Pilot plant manufacture of vanadium carbide (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 906-909 
    Details
    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 A manometric study was carried out of the reduction of vanadium oxide with carbon, and it was found that the pressure vs time curve exhibits three discontinuities, at temperatures of 1200°C (formation of the monoxide VO), 1400°C (formation of VCX-VO solid solutions), and 1700°C (formation of the carbide VCX). An investigation of the vacuum reduction of vanadium oxide confirmed that it is impossible to obtain a vanadium carbide with a carbon content in excess of that represented by the formula VC0.9. It was found that the optimum conditions for the preparation of large, pilot plant scale, batches of a vanadium carbide phase with a composition corresponding to VC0.9 by the reduction of the oxide V2O3 with graphite heating elements and a reducing gas atmosphere are as follows: heating to a temperature of 1900°C in 40 min and subsequent holding for 60 min.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00780313
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  • 2
    Electronic Resource
    Electronic Resource
    The phases in the lanthanum-germanium system (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 964-965 
    Details
    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 The lanthanum-germanium system was investigated. The existence of four, previously established compounds was confirmed. The width of the homogeneity region of the lanthanum-rich compounds is narrow. The width of the homogeneity region of lanthanum digermanide extends over the composition range LaGe-LaGe2.0, which corresponds to germanium contents of 42–51%. Lanthanum digermanide exhibits two modifications with crystalline structures of the α-ThSi2 and α-GdSi2 types, which are capable of independent existence at room temperature. The phase with an α-GdSi2 type structure forms at germanium contents corresponding to the compositions LaGe1.8-LaGe2.0, while the α-ThSi2 type structure forms at germanium contents lower than theoretical (42–45 wt.%). At the composition LaGe1.7, the phases with the α-GdSi2 and α-ThSi2 type structures coexist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773432
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  • 3
    Electronic Resource
    Electronic Resource
    Preparation of neodymium digermanide (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 121-123 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774304
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  • 4
    Electronic Resource
    Electronic Resource
    Conditions of preparation of zirconium silicides (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 178-181 
    Details
    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. A study was made of conditions under which the zirconium suicides ZrSi2, ZrSi, Zr5Si3, and Zr2Si are produced by the silicothermic reduction of zirconium dioxide in a vacuum. 2. It has been established that silicothermic reduction in graphite furnaces can yield only the suicides ZrSi2 and ZrSi. The lower-silicon phases Zr5Si3 and Zr2Si cannot be produced by this technique. 3. At temperatures in excess of 1700°C, owing to the low thermodynamic stability of the lower suicides and the occurrence of several secondary reactions, the principal reaction products are silicon, which vigorously evaporates, and zirconium carbide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774148
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  • 5
    Electronic Resource
    Electronic Resource
    Production of zirconium carbide on a pilot-plant scale (1968)
    Springer
    Powder metallurgy and metal ceramics 7 (1968), S. 317-319 
    Details
    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: Summary The production of zirconium carbide under industrial conditions was investigated. It is shown that the optimum process parameters, yielding a product with a maximum combined-carbon content, are: reduction of a stoichiometric charge composed of zirconium dioxide and carbon black in a resistance furnace with a graphite heating element at a temperature of 2200°C and a holding period of 60 min in a hydrogen atmosphere. The charge is rammed, in batches weighing 1500–2300 g, into graphite cartridges. It is demonstrated that zirconium carbide can be produced also in a converted-gas atmosphere or without a protective atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00775800
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  • 6
    Electronic Resource
    Electronic Resource
    Structure and properties of yttrium germanides (1969)
    Springer
    Powder metallurgy and metal ceramics 8 (1969), S. 37-39 
    Details
    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 authors have synthesized by arc fusion from the elements yttrium germanide phases with the composition YGe2 (unidentified structure), YGe, and Y5Ge3. 2. The pycnometric densities of the yttrium germanide phases have been determined and exhibit a close agreement with the x-ray densities. 3. The microhardnesses and melting points of these phases have been measured. It was found that they decrease as we go from phases with little germanium to those with high contents. 4. A correlation has been established between the microhardnesses, melting points, and electron structural characteristics of yttrium and germanium atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774018
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  • 7
    Electronic Resource
    Electronic Resource
    On some rare-earth germanides (1967)
    Springer
    Powder metallurgy and metal ceramics 6 (1967), S. 926-928 
    Details
    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 We have studied the conditions for obtaining the germanide phases Me5Ge3, MeGe, and MeGe2 for lanthanum, cerium, praseodymium, and neodymium by arc melting in argon. The optimal ratios of the initial components have been established. To obtain digermanides of lanthanum, cerium, and praseodymium we must have a 1% excess of germanium in the initial mixture; to obtain neodymium germanides the initial mixture must have a deficit of 1–3% of Nd5Ge3 and NdGe2 and 1–5% for NdGe. The pyconometric densities and microhardnesses of the germanides have been measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00773857
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  • 8
    Electronic Resource
    Electronic Resource
    Reaction between zirconium carbide and silicon powders (1969)
    Springer
    Powder metallurgy and metal ceramics 8 (1969), S. 914-917 
    Details
    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 A study was made of the reaction of zirconium carbide and silicon powders over the temperature range 800–1700
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00778401
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  • 9
    Electronic Resource
    Electronic Resource
    Chemical properties of lanthanoid boride powders (1970)
    Springer
    Powder metallurgy and metal ceramics 9 (1970), S. 353-356 
    Details
    ISSN: 1573-9066
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00796497
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  • 10
    Electronic Resource
    Electronic Resource
    The electrical properties of chromium borides, carbides, and nitrides (1962)
    Springer
    Powder metallurgy and metal ceramics 1 (1962), S. 243-247 
    Details
    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: Summary The electrical properties of borides, carbides and nitrides of chromium were studied, which made it possible to elucidate certain questions of the electron structure of the given phases. It was established that for an atomic proportion of metalloid of 0.25 there is a quantitive correlation between the electrical resistance and the magnitude of its first ionization potential. The variation in the electrical properties with a rise in the metalloid content in the systems Cr-B, Cr-C and Cr-N is explained by the differences in the effects of atoms of boron, carbon and nitrogen on the value of the overlapping of 4s and 4p chromium bands, on the degree of its d-state defect, and also the difference in the ionization potentials of the indicated metalloids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00774426
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