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 50, Issue 4
Displaying 1-12 of 12 articles from this issue
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  • Production of Sintered Material used 20Cr-5Al Heat Resistant Stainless Steel Fiber by Coiled Sheet Shaving
    Masao Kaneko, Min-yong Jun, Masato Imamura, Akira Yanagisawa
    2003 Volume 50 Issue 4 Pages 253-259
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.253
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    Sintered material made of stainless steel fibers is mainly used for surface combustion burners, automobile mufflers, gas filters and others. In the recent years, the applied temperature of those devices, are rising due to improved heat efficiency and output of them, which have led to demands for higher heat-resistance in parts and filters used in those devices.
    Lately, the 20Cr-5Al heat-resistant stainless steel was developed for the metal honeycomb material for automobile catalyst carrier. However, there are no efficient methods to fabricate metal fibers from this 20Cr-5Al heat-resistant stainless steel at low costs at this point. The coiled sheet shaving method allows fabrication of metal fibers from 20Cr-5Al heat-resistant stainless steel at low cost for applications to highly heat-resistant porous materials.
    In this study, 20Cr-5Al heat-resistant stainless steel fibers obtained by the coiled sheet shaving method were subject to fabricating unwoven material, and fabrication conditions of porous metal fiber sintered materials were investigated. The results confirmed that while the sintered material surface turns black and strength is poor with the separator of low pure alumina sheet (SSA-H) and mullite sheet (HB), metal color and high strength can be obtained by using highly pure alumina sheet (SSA-S), carbon sheet, and molybdenum sheet.
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  • Mössbauer Study on Fe-Si-Al Flakes-polymer Composites for Noise Filter at High Frequency Bands
    Kiyoshi Nomura, Kei Suzuki, Tsuguo Sawada, Yusuke Ujihira, Shigeyoshi ...
    2003 Volume 50 Issue 4 Pages 260-265
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.260
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    The composites of Fe-Si-Al alloy flakes and dielectric polymer were mainly characterized by transmission and conversion electron Mossbauer spectrometry (TMS and CEMS). The Fe-Si-Al flakes were prepared by milling the Sendust powder (9.8mass%Si, 5.9mass%Al, and balance Fe) in n-hexane solvent for several hours and days. The deformed structures were estimated by magnetic hyperfine field distributions, and further the annealing effects were investigated. The composites of Fe-Si-Al alloy forged for less than 100 hours recovered high permeability with production of DO3 structure after annealed at 650°C for 2 hours in Ar atmosphere. However, the polymer composites of Fe-Si-Al alloy flakes forged for 180 hours, which could apply to new noise suppression filter in several GHz frequency bands, gave broad hyperfine distributions with high magnetic fields. The forged flakes were decomposed into a-Fe in the bulk and Fe species dispersed in Si or Al interface beneath the Si and Al oxides surface by annealing.
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  • Preparation of Composite Materials with Ag+-ion-conducting RbAg4l5 Crystals and Thermo-elastic Polymers (SEPS)
    Sayo Katou, Nobuya Machida, Yoshiyuki Ikeda, Toshihiko Shigematsu
    2003 Volume 50 Issue 4 Pages 266-271
    Published: April 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.266
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    Silver-ion conducting organic-inorganic composites were prepared. An organic thermo-elastic polymer (SEPS: styrene-ethlene-proplylene-styrene co-polymer) and an inorganic silver ion conductor RbAg4I5 which was prepared by mechanical milling processes were used as starting materials for the preparation of the composite materials. The mixture of the starting materials were heated at 90-100°C under a pressure of about 4×106 Pa for 1 h to prepare the composite sheets. The obtained composite sheet containing 25 vol% of SEPS showed ion conductivity 5.3×100 Sm-1 at room temperature. The Ag+ ion transport number of the obtained sheets was almost unity.
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  • Study of lodine Intercalation into Bi2Sr2CaCu2Oy Single Crystal under the Existence of Mo
    Yoshitaka Inou, Tomohiro Ando, Takeshi Horiuchi, Shoichi Nasu, Kentaro ...
    2003 Volume 50 Issue 4 Pages 272-274
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.272
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    A new compound has been synthesized by iodine intercalation on Bi2212 single crystal under the existence of Mo. Its lattice parameter along the c-axis was 1.842 nm which is shorter than that of I, Bi2Sr2CaCu2Oy (1.900 nm). The fluorescence X-ray analysis microscope data showed that only I2 was intercalated in Bi2212. The thermogravimetric curve showed weight loss of 7.6%. The temperature dependence of the out-of-plane normal resistivity was changed from semiconductor-like to metallic-like after intercalation. The transition temperature(onset) of the intercalated compound was 83 K lower than that of Bi2212 by 12K.
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 50 Issue 4 Pages 276
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.276
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  • Search for New Transition Metal Oxides and Single Crystal Growth at High Pressures
    Masaki Azuma
    2003 Volume 50 Issue 4 Pages 277-283
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.277
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    High pressure synthesis is a powerful technique in searching for new materials. Generally speaking, however, it used to be almost impossible to obtain single crystal samples of these high-pressure phases. To be reported here is the single crystal growths of various transition metal oxides by means of flux method based on the synchrotron X-ray powder diffraction studies at high pressures of several GPa. Some results on the structure analysis based on synchrotron X-ray powder diffraction will also be shown.
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  • Texture Engineering of Perovskite-type Piezoelectric Ceramics by Reactive Templated Grain Growth Method
    Toshihiko Tani, Toshio Kimura
    2003 Volume 50 Issue 4 Pages 284-291
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.284
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    We have proposed the reactive templated grain growth (RTGG) method, in which highly textured ceramics are fabricated by the reaction between aligned template particles and complementary reactant materials at the first stage and successive grain growth during the second stage of heat treatment. A regular perovskite-type structured Bi0.5(Na, K)0.5TiO3 (BNKT) bulk ceramic with a preferred <100> orientation was prepared by using Bi4Ti3O12 (BiT) platelets as a reactive template. The textured BNKT ceramics exhibited higher piezoelectric properties than randomly oriented ceramics with the same composition. The proposed method has been extended to other systems with bismuth layer-structured ferroelectrics as well as regular perovskite-type piezoelectrics and dielectrics.
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  • Preparation and Electrical Properties of Modulation-doped ZnO Multi-layer Structure
    Yutaka Adachi, Naoki Ohashi, Isao Sakaguchi, Hajime Haneda, Haruki Ryo ...
    2003 Volume 50 Issue 4 Pages 292-296
    Published: April 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.292
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    Modulation-doped ZnO multi-layer structures were synthesized and their electrical properties were investigated. First, AlxMgyZnl-x-yO films were prepared as carrier injection layers for modulation doping. The films were deposited on sapphire (1120) substrates by pulsed laser deposition using Nd : YAG laser with the wavelength of 266 nm. It is confirmed that the modification of a band gap and heavy electron doping can be simultaneously achieved in the films. Secondly, modulation-doped multi layer [ZnO/Al0.01Mg0.05Zn0.94O]10 was grown on a sapphire (1120) subatrate. X-ray diffraction pattern of the film showed the satellite peaks corresponding to the multi-layer period. Hall mobility of the film was 43 cm2/V⋅n, which was close to that of AlxMgyZnl-x-yO single-layer.
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  • Change in Conductivity of Yttria Stabilized Zirconia
    Masatoshi Hattori, Yasuo Takeda, Satoshi Ohara, Jin-Ho Lee, Kazuo Muka ...
    2003 Volume 50 Issue 4 Pages 297-301
    Published: April 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.297
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    The change in conductivity of 8 mol% and 10 mol% yttria stabilized zirconia (8YSZ and 10YSZ, respectively) were measured during continuous current loading at 1000°C. The conductivity of 8YSZ gradually degraded with holding time in the test and it decreased to about 65% of the initial value after annealing for 1500h. However, the conductivity of 10YSZ is constant under the same condition. The crystal structure of the samples before and after annealing was investigated by X-ray diffraction techniques, Transmission electron microscopy, and Raman spectroscopy. It was concluded that the deterioration in conductivity of 8YSZ related to the phase transformation, such as gradual formation of fine tetragonal phase which had lower conductivity than cubic phase had.
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  • Laser Treatment of Pressed Superconductor Powder of Bi System
    2nd Report Application of Surface Melting Method
    Hajime Miyazawa, Katsuyoshi Hotta, Yusuke Naganuma, Haruo Hirose
    2003 Volume 50 Issue 4 Pages 302-305
    Published: April 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.302
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    The bulk specimen of superconductor powder shows no superconductive characteristics as die-pressed. In this paper, we propose a technique of forming a superconductive layer in the surface of the bulk specimen of a Bi system using a laser. The powder of the Bi system was press-formed, followed by melting of the surface scanned by a CO2 laser beam. This treatment results in a gradual temperature change, from the melting to the non-heat-affecting range both on the surface and inside the bulk. We found a superconductive layer, as thick as 130 μm, underneath the melted layer that shows semiconductive characteristics. This technique allows melting of the surface, and thus it has the advantage of high reproducibility without strict control of laser treatment conditions.
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  • Effect of Boron Particle Size on the Formation and Superconductivity of MgB2
    Kunio Matsuzaki, Kotaro Hanada, Kanichi Hatsukano, Toru Shimizu, Satos ...
    2003 Volume 50 Issue 4 Pages 306-309
    Published: April 15, 2003
    Released on J-STAGE: July 12, 2010
    DOIhttps://doi.org/10.2497/jjspm.50.306
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    MgB2 superconductors were prepared by sintering of a mixture of Mg powder and born powder with different particle sizes at 1073K for 12h. The single MgB2 was obtained at particle sizes below 20μm and showed a superconducting onset temperature of 38K and zero resistance temperature of 36K. The amorphous boron with particle sizes below 1μm makes it easier to form a MgB2. The single MgB2 was obtained by sintering at 1073K for 1h. Even by the sintering at a temperature as low as 873 K, the MgB2 with a zero resistance temperature of 36K was obtained.
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  • Synthesis of MgB2 from Gas-atomized AZ31 Alloy Powders and their Superconductivities
    Munio Matsuzaki, Kotaro Hanada, Kanichi Hatsukano, Toru Shimizu, Satos ...
    2003 Volume 50 Issue 4 Pages 310-313
    Published: April 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.310
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    MgB2 superconductors were prepared by sintering of a mixture of boron and gas-atomized AZ31 powders. The single MgB2 with superconductivity at about 38K was obtained by sintering at 1073K for 12h or at 873K for 50h. The AZ31 powders promotes a formation of MgB2 at 873K compared with pure Mg powder. The thermal analysis showed that the formation of MgB2 occurred at around 823K and a partial melting of AZ31 alloy occurred at 850K, suggesting that the MgB2 is formed at 873K through a melting phase. Then, the partially melted phase plays an important role on the formation of MgB2. The AZ31 powder is useful to obtain a MgB2 at a temperature as low as 873K.
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