粉体および粉末冶金
Online ISSN : 1880-9014
Print ISSN : 0532-8799
ISSN-L : 0532-8799
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7 巻, 1 号
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  • タングステン粉のガス炭化について(第1報)
    大久保 大蔵, 小川 和彦
    1960 年 7 巻 1 号 p. 1-8
    発行日: 1960/02/25
    公開日: 2009/05/22
    DOIhttps://doi.org/10.2497/jjspm.7.1
    ジャーナル フリー
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    A study was made to investigate carburization of tungsten powder by H2-CH4. The results obtained are summarized as follows:(1) According to X-ray examination, fine tungsten powder is carburized to WC at 700°C by H2-CH4.(2) The thermal decomposition rate of CH4 on the surface of tungsten powder is larger on the initial stage of carburization process, and then decreases with carburization time at the temperature range between 800-1000°C. (3) The CH4 concentration of H2-CH4 mixtures on the range of CH4/H2=1/1-1/5 in volume have no remarkable effects on the total carbon contents of the products. (4) The thickness of the tangsten powder layer has remarkable effect on the total carbon contents of the products. (5) According to X-ray examination, the crystal lattice of WC formed between 700-1000°C are abnormal.
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  • ON THE SINTERING OF ALUMINA (I)
    The Effect of Particle Size and Atmosphere upon Sintering
    Kenzo HIJIKATA, Kazuo MIYAKE
    1960 年 7 巻 1 号 p. 9-14
    発行日: 1960/02/25
    公開日: 2009/05/22
    DOIhttps://doi.org/10.2497/jjspm.7.9
    ジャーナル フリー
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    The shrinkage of pure α-A12O3 with very fine particle size was observed continuously in the high temperature dilatometer. The investigation shows that the shrinkage was increased in the following conditions :
    1) The particle size was fine:
    2) The temperature was high :
    3) The atmosphere was neutral.
    But the temperature at which the sintering began did not vary with these conditions, and was about 1000-1050°C. The time-rate of height shrinkage was calculated from the isothermal shrinkage curves at 1200°C, 1360°C and 1500°C in air and in argon. It was found that they were proportional to 1/5-power or less than 1/5-power of time, which were smaller than that measured and calculated on coarse powder, because the initial stage of sintering had already passed in this experiment.
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  • 特許面における超硬合金の最近の状況について
    矢島 林二郎
    1960 年 7 巻 1 号 p. 15-18
    発行日: 1960/02/25
    公開日: 2009/05/22
    DOIhttps://doi.org/10.2497/jjspm.7.15
    ジャーナル フリー
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