Journal of the Japan Society of Powder and Powder Metallurgy
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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Volume 6, Issue 2
Displaying 1-4 of 4 articles from this issue
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  • Research on Manufacture of "Heavy Alloys" Composed of Tungsten-Nickel-Copper System
    Tatsuo Matsukawa, Tosiyuki Sakai
    1959 Volume 6 Issue 2 Pages 45-54
    Published: April 25, 1959
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.6.45
    JOURNAL FREE ACCESS
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    Ammonium paratungstate forms its double salt in existence of an ammoniacal soln. of the nickel salt. W-Ni compound powders obtained by calcining and reduction of this double salt are very fine and their shapes are intricate. Compound powders accordingly have superior properties as a raw material for "Heavy Alloys". The physical or the mechanical properties of the "Heavy Alloy" composed of 90% W, 1% Ni and 9% Cu are excellent, if the compound powders are used for a raw material. Density of an above-mentioned alloy which is sintered at 1, 240°C for only lhr. attains to 17.19g/c.c. Besides, the specific resistance is about 8μΩ⋅cm and the ultimate breaking strength shows 168kg/mm2.
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  • Formation of NiAl2O4 Spinel by Solid Reaction
    Yoshio Iida
    1959 Volume 6 Issue 2 Pages 55-68
    Published: April 25, 1959
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.6.55
    JOURNAL FREE ACCESS
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    The investigation of phase equilibrium of NiO-A2O3 system at 1650°C shows that Al2O3 dissolves by 20 mole % into spinel crystal but NiO does not dissolve. The lattice constant of the spinel is decreased continuously by the dissolution of Al2O3. The particle size of NiO, the method of preparation of NiO and additive impurities affect the rate of spinel formation but compacting pressure of NiO-Al2O3 mixture does not affect. The activation energy of spinel. formation by Jander' sequation is about 33Kcal/mole in air, and this value is approximately the same as that of electrical conductivity of spinel in air. The activation energies of the electrical conductivity of spinel in oxygen, air and vacuum are 28.9, 30.8 and 36.2 Kcal/mole respectively. The decrease in the rate of spinel formation with a decrease in the partial pressure of oxygen in the surrounding atmosphere is related to the decrease in the activation energy of the electrical conductiviiy of the spinel.
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1959 Volume 6 Issue 2 Pages 69-76
    Published: April 25, 1959
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.6.69
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1959 Volume 6 Issue 2 Pages 80-82
    Published: April 25, 1959
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.6.80
    JOURNAL FREE ACCESS
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