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 61, Issue 10
October
Displaying 1-6 of 6 articles from this issue
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Paper
Memorial Lecture of JSPM Award
  • Industrialization and application of atomized fine powder for PM industry
    Yoshiyuki KATO
    2014 Volume 61 Issue 10 Pages 465-472
    Published: October 15, 2014
    Released on J-STAGE: November 25, 2014
    DOIhttps://doi.org/10.2497/jjspm.61.465
    JOURNAL OPEN ACCESS
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    The history of metal powder raw materials in the powder metallurgy is powder about average particle size 70 µm represented by − 100 Mesh. A metal powder mass productions technology less than average particle size 10 µm progressed in the past 3 decades. By the progress of this fine metal powder production technology, the new PM technology and use that conventional − 100 Mesh powder did not have were able to open. I survey the present conditions and the future in the field of powder metallurgy of this new Fine powder here.
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Paper
  • Grain Growth in Polycrystalline Nickel Powder Compacts during Early Stage of Sintering
    Kazunari SHINAGAWA, Atsushi MORIOKA, Takashi MIZUGUCHI, Yasuhiro TANAK ...
    2014 Volume 61 Issue 10 Pages 473-480
    Published: October 15, 2014
    Released on J-STAGE: November 25, 2014
    DOIhttps://doi.org/10.2497/jjspm.61.473
    JOURNAL OPEN ACCESS
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    It may be important to elucidate the mechanism of grain growth during the early stage of sintering, especially for micro-scale sintered products, of which size is close to that of powder particles. This study aims to clarify the grain growth behavior in powder compacts, that is, porous bodies. Sintering experiments of the powder compacts with polycrystalline nickel particles were conducted in temperatures lower than usual, for long time, and the change in crystal grain size were revealed by electron backscatter diffraction analysis in a scanning electron microscope. It was found that the crystal grain size increased, but did not go over the size of powder particles in the case of sintering at the lower temperatures. A phase-filed simulation of sintering process for two polycrystalline particles was also performed to examine the effects of neck growth on grain boundary migration. It was confirmed that the two polycrystalline particles of equal-size became two single-crystal grains when the sintering shrinkage rate was set to be low, which may be correspond to the experimental results at the lower temperatures.
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  • Formation and Microstructural Characterization of Ti/TiC Surface Composite Layer by Laser Alloying Treatment Using Graphite Powder
    Takuto YAMAGUCHI, Hideki HAGINO, Mamoru TAKEMURA, Atsushi NAKAHIRA
    2014 Volume 61 Issue 10 Pages 481-486
    Published: October 15, 2014
    Released on J-STAGE: November 25, 2014
    DOIhttps://doi.org/10.2497/jjspm.61.481
    JOURNAL OPEN ACCESS
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    Titanium and its alloys have various excellent properties, such as good corrosion resistance and high specific strength. However, they have not been applied to the sliding parts under sever wear condition due to their poor tribological properties.
    In this study, laser alloying using graphite powder was carried out to form Ti/TiC composite surface layer on commercial pure titanium substrate for improving wear resistance. The effects of graphite powder size and laser irradiation parameters on the microstructure of laser alloyed zone were mainly investigated. In the laser alloyed zone, dendritic primary TiC and fine particles of eutectic TiC were observed. In the condition of higher laser traverse speed and larger size of graphite powder, undissolved graphite particles were observed.
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  • Adsorption and Desorption Behavior of Water in Iron and Alloyed Steel Powders
    Yutaro SHIRAISHI , Yuta MIZUNO, Hikaru KIMURA, Atsushi HIBINO
    2014 Volume 61 Issue 10 Pages 487-495
    Published: October 15, 2014
    Released on J-STAGE: November 25, 2014
    DOIhttps://doi.org/10.2497/jjspm.61.487
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    In this paper, for Fe, Fe–3%Cr, Fe–4%Ni, Fe–Cr–Ni (SUS304L), and Fe–1.5%Mo alloyed steel powders,adsorption and desorption behaviors of water were investigated. The compacts made from the powders were heated in a steam pot for 60minutes, and were dried in an air-conditioned room. Additionally, the mass changes were measured accurately.
    In case of Fe–Cr–Ni (SUS304L) and Fe–3%Cr powders, the weight of the compacts increased with steam treatment. The weight of the compacts returned again to initial weight by drying in the air-conditioned room. However, in case of Fe–4%Ni and Fe–1.5%Mo powders, in spite of the steam treatment, the weight decreased rather than the starting of the steam treatment. Furthermore, the weight did not return to the initial weight by drying. It is said that water molecule adsorbed physically or chemically on powder surface. In case of Fe–Cr–Ni (SUS304L) and Fe–3%Cr powders, it is thought that the water molecule adsorbed physically on the powder because the weight returned to the initial weight. However, in case of Fe–4%Ni and Fe–1.5%Mo powders, the weight did not return to initial weight. Therefore, it is thought that the water molecule adsorbed chemically. Furthermore, the water release behavior from the powders were measured by a gas-chromatograph analyzer.
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