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 12
December
Displaying 1-9 of 9 articles from this issue
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Paper
Paper
  • Synthesis of (Ti, Mo)(C, N) Powder by Using Rotary Tube Furnace
    Tetsushi MATSUDA, Hideaki MATSUBARA
    2013 Volume 60 Issue 12 Pages 495-499
    Published: December 15, 2013
    Released on J-STAGE: January 21, 2014
    DOIhttps://doi.org/10.2497/jjspm.60.495
    JOURNAL OPEN ACCESS
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    The effects of MoO3 addition on the carbothermal reduction of fine TiO2 were studied for obtaining nanopowders and for understanding the mechanism of the carbothermal reduction. TiO2 was mixed with C powder and MoO3 powder. The mixed powder was heat treated in a rotary tube furnace up to 1773 K. The results indicated that the particle size of TiO2 – MoO3 – C powder heated in the rotary tube furnace was comparable to that heated in batch-type furnace. The CO gas concentration during the carbothermal reduction of TiO2 – MoO3 – C powder was measured. It was confirmed that the reduction temperature of titanium oxide decreased with an addition of MoO3.
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Special Issue: Functionally Graded Materials · Biomaterials
Summarization
Review
  • Design of Biomedical Materials for Treatment of Cancer and Bone Diseases
    Masakazu KAWASHITA
    2013 Volume 60 Issue 12 Pages 503-509
    Published: December 15, 2013
    Released on J-STAGE: January 21, 2014
    DOIhttps://doi.org/10.2497/jjspm.60.503
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    Ceramic microspheres containing yttrium and/or phosphorus are useful for intra-arterial radiotherapy. Indeed, radioactive yttrium oxide (Y2O3) microspheres with high chemical durability can remarkably suppress growth of VX2 tumor. Hollow Y2O3 microspheres and yttrium phosphate (YPO4) microspheres have been also developed. Magnetic microspheres are believed to be useful for intra-arterial hyperthermia of cancer. It is confirmed that silica (SiO2) microspheres containing magnetite (Fe3O4) and maghemite (γ – Fe2O3) nanoparticles can generate heat under alternating magnetic field. On the other hand, development of metallic biomaterials with osteoconductivity as well as antibacterial property is desired so that incidence of infection after surgery is decreased. Titanium (Ti) metal with anion-doped titania (TiO2) surface might be a novel metallic biomaterials with ex vivo antibacterial property and in vivo osteoconductivity. Further, we recently proposed that specific adsorption of proteins on hydroxyapatite (HAp) might play an important role in the expression of osteoconductivity in vivo. The fundamental reach on relationship between specific protein adoption and osteoconductivity is believed to be useful for development of bone-repairing biomaterials with extremely high osteoconductivity. Development of novel biomedical materials for treatment of cancer and bone diseases is strongly desired to contribute to better health and welfare of patients with cancer and/or bone diseases.
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  • Efficient Research and Development of Functionally Graded Materials (FGMs) Use to the Analysis of FGMs Database
    Kazuhiro HASEZAKI
    2013 Volume 60 Issue 12 Pages 510-515
    Published: December 15, 2013
    Released on J-STAGE: January 21, 2014
    DOIhttps://doi.org/10.2497/jjspm.60.510
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    The materials selections of MoSi2/Mo/Nb/γ – TiAl FGMs were performed with the analysis of FGMs database. The stable FGMs criterion without interlayer cracking of ∆α∆T less than 4.3 × 10−3 was derived from FGMs database, where ∆T is the differences in the thermal expansion coefficient and temperature ∆T is between processing and room temperatures. The MoSi2/Mo/Nb/γ – TiAl FGMs were prepared using the spark plasma sintering (SPS) method, followed by siliconized in molten salts. Nb foil was firmly joined to the γ – TiAl surface and Mo foil was firmly joined to the Nb foil. The ∆αNb−Mo∆T and ∆αγ−TiAl−Nb∆T values were consistent with the criterion, where ∆αNb−Mo, ∆αγ−TiAl−Nb, and ∆T arethe differences between the coefficients of thermal expansion of Nb and Mo, and of γ – TiAl and Nb, and ∆T is the difference between the SPS temperature and room temperature. The MoSi2/Mo/Nb/γ – TiAl FGMs were dense and had neither cracks nor voids. The thickness loss of the MoSi2/Mo/Nb/γ – TiAl FGMs was 11 µm after 200 h exposure to air at 1323 K.
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Review
  • Microstructure Control of Composite Porous Materials and its Application
    Makio NAITO, Hiroya ABE, Akira KONDO, Takahiro KOZAWA
    2013 Volume 60 Issue 12 Pages 516-522
    Published: December 15, 2013
    Released on J-STAGE: January 21, 2014
    DOIhttps://doi.org/10.2497/jjspm.60.516
    JOURNAL OPEN ACCESS
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    Smart powder processing stands for novel powder processing techniques that create advanced materials with minimal energy consumption and environmental impacts. Particle bonding technology is a typical smart powder processing technique to make advanced composites. The technology has two main unique features. Firstly, it creates direct bonding between particles without any heat support or binders of any kind in the dry phase. The bonding is achieved through the enhanced particle surface activation induced by mechanical energy, in addition to the intrinsic high surface reactivity of nanoparticles. Using this feature, desired composite particles can be successfully fabricated. The second feature of this technology is its ability to control the nano/micro structure of assembled composite particles. As a result, it can custom various kinds of nano/micro structures and can produce new materials with a simpler manufacturing process. In this paper, particle bonding process developed by the authors will be introduced. New one-pot processes for controlling the microstructure of composite porous materials will be explained. They were developed by making use of particle bonding technology. Furthermore, their applications for high performance thermal insulation materials, electrodes of lithium ion battery and those of solid oxide fuel cells will be explained.
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