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 60, Issue 4
April
Displaying 1-9 of 9 articles from this issue
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Paper
Rapid Communication
  • The Effect of Transition Element Doping on the Particulate Matter Oxidation of La1.5Sr1.5Mn2O7−σ
    Ippei KATO, Masaki MORIYA, Tetsuya IKEDA, Kohji MASUDA, Fumio MUNAKATA
    2013 Volume 60 Issue 4 Pages 137-140
    Published: March 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.137
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    The effect of transition element (TE = Fe, Ni, Cu) doping on the particulate matter (PM) oxidation in the Ruddlesden-Popper-type (RP - type) compound La1.5Sr1.5Mn2O7−σ was investigated for a dopant concentration fixed of 0.05 %. Though there is no structural change accompanied by doping, thermogravimetry curves show the noticeable difference according to the dopant. Then, Cu doping is found to be more effective than Fe and Ni doping. Finally, it was found that La1.5Sr1.5Mn1.95Cu0.05O7−σ is one of the promising PM oxidation catalysts for the catalyzed soot filter.
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Paper
  • Fatigue Strength of Sintered and Super Rapid Induction Heated and Quenched (SRIQ) Compacts made of Mo Prealloyed Steel Powder
    Shigeru UNAMI, Yukiko OZAKI, Yoshitaka MISAKA, Kengo FUKAZAWA
    2013 Volume 60 Issue 4 Pages 141-145
    Published: April 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.141
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    The fatigue strength of the sintered and super rapid induction heated and quenched (SRIQ) compact made of the 0.6 mass% Mo - 0.2 mass% Mn prealloyed steel powder has been investigated. As the effective case depth in the SRIQ material decreased, fatigue strength increased, and reached to 400 MPa equivalent to two times of the carburized material in the case of 1 mm of the effective case depth. Moreover, fatigue strength of 500 MPa was obtained by double SRIQ treatment, in which specimens was quenched to the center region in the first SRIQ, and to 1 mm of the effective case depth in the subsequent treatment. The improvement in the fatigue strength can be considered to result from not only the high compressive residual stress but also the fine prior austenite grain.
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  • Characterization of Ancient Red Iron Oxides Excavated from the Shimo-ohgibaru Archaeological Site in Kumamoto, Japan
    Hiromi TSUJI, Ryu MURAKAMI, Takashi MIYAZAKI, Hideki HASHIMOTO, Teruak ...
    2013 Volume 60 Issue 4 Pages 146-153
    Published: April 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.146
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    To clarify the detailed features of the red bengala samples excavated from the Shimo-ohgibaru archaeological site in the late Yayoi period (2nd to 3rd century A.D.) from the viewpoint of materials science, colorimetric measurements, X-ray fluorescence analyses, X-ray diffraction measurements, transmission electron microscope observations, and surface area measurements of the ancient bengala samples were achieved. The ancient bengala sample was found to be high purity α - Fe2O3. The features of the color tone and particle size of the ancient bengala were clarified by comparing with those of commercially available bengala, Fukiya bengala, and synthesized α-Fe2O3. In addition, the starting materials and synthesis processes of the ancient bengala were discussed by applying the elutriation experiments of representative natural hematite and heat-treated natural iron hydroxide (Oniita).
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  • Preparation of CoAl2O4 by Corrosion Synthesis
    Osami SERI, Koumei IWAMA, Daichi SASAKI
    2013 Volume 60 Issue 4 Pages 154-159
    Published: April 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.154
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    Attempts have been made to obtain the cobalt spinel (CoAl2O4) by using corrosion of cobalt and aluminium chloride as catalysis. A few micron size powder was obtained when the corrosion product was hydrolyzed and calcinated at the temperature of 1073 K or more. The powder was identified as CoAl2O4 spinel by XRD diffraction analysis. Corrosion synthesis as one of the inorganic syntheses is explained from the viewpoint of electrochemical phenomena and considered its merits and demerits in the case of making the spinel of CoAl2O4.
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  • Microstructure and Mechanical Properties of High Speed Steel/Carbon Steel Composite with Harmonic Structure
    Yusuke YAMADA, Hiroshi FUJIWARA, Hiroyuki MIYAMOTO, Kei AMEYAMA
    2013 Volume 60 Issue 4 Pages 160-166
    Published: April 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.160
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    Harmonic structured materials with fine and coarse grains demonstrate not only enhanced strength but also enough ductility simultaneously. The harmonic structured material consists of a network like a fine grain region and a dispersed coarse grain region. The high strength and enough ductility are attributed to the network fine grain region and the dispersed coarse grain region, respectively. In this study, the harmonic structured metallic composite with high speed steel (HSS) and low carbon steel (LCS) is fabricated by mechanical milling and spark plasma sintering process. The harmonic structured HSS/LCS composite consists of the network like fine grain region with HSS and dispersed coarse grain region with LCS. The hardness of the harmonic structured composite with HSS and LCS is higher than the conventional particle dispersed composite with the same HSS volume fraction.Furthermore, the harmonic structured composite with HSS and LCS indicates high tensile strength without ductility loss, compared to the conventional HSS particle dispersed composite with the same HSS volume fraction. The harmonic structure control of composite materials is effective to improve the mechanical properties with enough ductility maintained.
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Review
  • Production of High Performance Materials through Powder Consolidation and Mechanical Alloying Using High-Pressure Torsion
    Zenji HORITA
    2013 Volume 60 Issue 4 Pages 167-178
    Published: April 15, 2013
    Released on J-STAGE: May 16, 2013
    DOIhttps://doi.org/10.2497/jjspm.60.167
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    In this review paper, high-pressure torsion (HPT) is introduced as a processing tool for powder consolidation. It is shown that not only HPT can refine the grain size to the submicrometer and/or nanometer range in bulk metallic materials but also can achieve consolidation of metallic and ceramic powders including mechanical alloying, synthesis of intermetallics, allotropic phase transformation and fabrication of metal-matrix composites. Supersaturation of Fe in ultrafined grained Al is achieved in the Al - Fe system where Fe solubility in Al is as little as 0.052 mass%. Allotropic phase transformation of Ti and Zr occurs from α phase to ω phase during operation of HPT because of high pressure in comparison with the conventional ball milling process. Nanograined NiAl and TiAl intermetallics form by HPT processing including successive annealing at temperatures as low as ～0.35Tm where Tm is the melting temperature of the intermetallics. Fabrication of composites is feasible with nano ceramic particles dispersed in the metal matrix. Finally, applications of HPT to ceramics such as Al2O3 and ZrO2 demonstrate that it is possible to introduce plastic strain into their powders and thus to make their consolidation at reduced temperatures.
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