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 9
Displaying 1-12 of 12 articles from this issue
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  • Fabrication of NiTi Intermetallic Compound Powder by a Reactive Gas Atomization Process using a Laser
    Hiroshi Tomochika, Minoru Nishida, Takao Araki
    2003 Volume 50 Issue 9 Pages 657-663
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.657
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    In this work we have tried to produce powders of NiTi intermetallic compound from the composite wires of pure Ti wire with a diameter of 300μm and pure Ni wire with a diameter of 300μm to 250μm. The composite wire was melted and reacted using a YAG laser, and the melted metal was gas-atomized using high-pressure Ar gas. The shape of powders recovered in dry ice was spherical and the particle size of the obtained powder ranged from 10μm to 125μm.
    The compositions of the powders could be adjusted by changing the wire diameter of Ni in the composite wire, i.e., by changing the atomic ratio of Ti vs. Ni in the composite wire. Consequently, we produced powders of NiTi intermetallic compound with the purposive composition.
    The powders with a Ti-Ni composition ratio of 1:1 were mainly consisted of NiTi martensite phase. By this manufacturing method, the powders of NiTi intermetallic compound with Ms temperature of 335 K and Af temperature of 365 K could be produced.
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  • Effect of Transition Metal Chlorides on the Formation of β-CaSiO3 by the TW Method
    Yukihiro Kadogawa, Yasushi Tanaka, Yoshiharu Matsuda
    2003 Volume 50 Issue 9 Pages 664-669
    Published: September 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.664
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    Wollastonite (β-CaSiO3) was synthesized by the TW method from the mixed solutions of Si(C2H5)4 and CaC12 with both the small amount of 2M-HC1 as catalyst and separately the desired quantity of each aqueous solution made up of additives such as MnC12, FeC13, NiC12 or CuC12. In the case of the sample obtained without the additives, pure β-CaSi03 in a single phase was not obtained at any heat treatment temperature of this study. The acceleration effects of additives on the formation of β-CaSiO3 were arranged in the order of MnC12 > NiC12 > CuC12 > FeC13 at the temperature of 1100°C. MnC12 was most effective for the acceleration of β-CaSiO3 formation among the additives, and in the case of each sample obtained with the addition of MnCl2 with 7.8 × 10-3 mole or 9.3 × 10-3 mole, pure β-CaSiO3 in single phase was obtained at 1100°C. It was thought that β-CaSiO3 was formed by reaction of β-Cristobalite with Ca3Si2O7, simultaneously according to the phase transition from α-CaSiO3 to β-CaSiO3.
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  • Thermoelectric Properties of CuMxAl1-xO2 (M=Mg, Sr, Ca, Ba, Zn and Cd)
    Akinori Katsui, Jun Yoshizawa, Hiroaki Matsushita
    2003 Volume 50 Issue 9 Pages 670-673
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.670
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    CuMxAl1-xO2 (M=Mg, Sr, Ca, Ba, Zn and Cd) ceramics have been prepared using a solid phase reaction method. The phase identification during synthesis was investigated using X-ray diffraction measurement. The thermoelectric properties such as the Seebeck coefficient (S), electrical conductivity (σ) and thermal conductivity of the ceramics were evaluated after sintering at 1423 K for 2 h in air. The power factor, S2σ, of CuMg0.005Al0.995O2 was approximately 1.6 × 10-5 W/K2m over a wide range of temperature of 650 to 900 K, which was the highest among all specimens prepared, and the value was approximately twentyfold larger than the value of CuA1O2.
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  • Tool Wear of (Ti, B)N Coated Carbides
    Tadahiro Wada
    2003 Volume 50 Issue 9 Pages 674-679
    Published: September 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.674
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    In order to clarify the tool wear of (Ti, B)N coated carbides in the cutting of melted material (SCr420H) or sintered steel, the wear progress of (Ti, B)N coated carbides tool is investigated experimentally. The base metal of the coated carbides tool is cemented carbides. The main results obtained are as follows: (1) Both the micro-hardness and the critical scratch load of (Ti, B)N coated carbides tool are higher than those of TiN coated carbides tool. (2) In the cutting of SCr420H, the wear progress of (Ti, B)N coated carbides tool is slower than that of TiN coated carbides tool. (3) In the cutting of sintered steel, the tool wear of (Ti, B)N coated carbides tool is about equal to that of TiN coated carbides tool. However, in the high speed cutting of sintered steel, the wear progress of (Ti, B)N coated carbides tool is faster than that of (Ti, B)N coated carbides tool. It is found that the (Ti, B)N can be used as a coating material of cutting tool.
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  • [title in Japanese]
    [in Japanese]
    2003 Volume 50 Issue 9 Pages 688
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.688
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  • History and Future Prospects of HIP/CIP Technology
    Takao Fujikawa, Yasuo Manabe
    2003 Volume 50 Issue 9 Pages 689-698
    Published: September 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.689
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    The progress of HIP (Hot Isostatic Pressing) and CIP (Cold Isostatic Pressing) technology is discussed from the historical viewpoint and their future potential. Both technologies have been recognized as a useful method to obtain products with isotropic properties, uniform and high density and applied to the manufacture of some PM products and ceramic components. Especially in Japan these resultant natures attracted attentions of ceramic researchers, because both technologies could compensate for the lack of reliability due to the residual porosity formed in the forming and sintering stages. Nozzles for continuous casting of steel, ceramic balls, large carbon blocks and zirconia oxygen sensors have been produced by CIP and high speed tool steel billets, alumina cutting tool inserts, soft ferrite for magnetic recording heads by HIP. Entering the 21st century, slow-downed economy, reduced processing cost and environmental friendliness are demanding further development of smaller and lighter products with higher mechanical or electronic properties. As the requirement for the higher productivity in both processes is also getting severe, HIP/CIP equipment technology closely connected with the processing cost is changing to meet this requirement.
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  • New Preparation of Powders with Fine Particles and Their High-Pressure Sintering Using SHS, SPS, and HIP
    Osamu Yamaguchi
    2003 Volume 50 Issue 9 Pages 699-707
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.699
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    Various kinds of powder production methods (solution techniques) have been developed and utilized to prepare single-phase (monolithic or solid solution) and composite powders consisting of fine particles with a sharp sizedistribution; sol-gel techniques using metal alkoxides and acetylacetonates, and a newly developed hydrazine method.The latter solution technique has some merits i.e. easy and simple process to produce fine sinterable powders at relatively low cost due to use of aqueous metal salts as starting materials. By adopting these powder preparation techniques, dense structural materials and functional perovskite oxides (rare-earth chromites), nanocomposite materials with high densities have been fabricated.
    On the other hand, high-pressure techniques such as self-propagating high-temperature synthesis (SHS), spark plasma sintering (SPS), hot isostatic pressing (HIP), and their combined use have also been used for the fabrication of dense structural materials, i.e., silicides, nitrides, aluminides, borides, such as MoSi2, α-Ti(N), NiAl/ZrO2(3Y), CrB, etc. The present paper describes briefly some characteristics of powders thus prepared, and mechanical properties of condensed materials fabricated using SHS, SPS, and HIP in relation to their microstructures.
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  • Microstructure and Mechanical Properties of CrN-Based Composites with the Combined Addition of ZrO2(3Y) and Al2O3
    Ken Hiroat, Masaru Yoshinaka, Osamu Yamaguchi
    2003 Volume 50 Issue 9 Pages 708-712
    Published: September 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.708
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    Chromium nitride (CrN) powder consisting of granular particles of-2μm has been prepared by self-propagating high-temperature synthesis (SHS). SHS was conducted under a nitrogen pressure of 12 MPa using commercially available Cr powder. Dense monolithic CrN ceramics and CrN-based composites with the combined addition of 70vol%ZrO2(3Y)/30vol%Al2O3 have been fabricated by hot isostatic pressing for 7.2 ks at 1573 K and 196 MPa. The former ceramics composed of pure CrN. (-9.8μm) exhibit a bending strength (σb) of 400 MPa and a fracture toughness (KIC) of 3.3 Mpa⋅ m1/2 In the latter composites almost all the ZrO2(3Y) (0.1-0.2μm) and A12O3 (0.3 -0.6μm) grains are located at the grain boundaries of CrN (2-3μm). The high values of σb (1090 MPa) and KIC (5.0 Mpa⋅m1/2) are obtained in the composites with 40vol% combined addition.
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  • Internal Friction of Porous Alumina Produced by Different Sintering Processes
    Tetsu Takahashi, Koji Matsumaru, Kozo Ishizaki
    2003 Volume 50 Issue 9 Pages 713-716
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.713
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    Internal friction phenomena of porous alumina were investigated to evaluate the damping capacity. Raw powder was formed into a rectangular parallelepiped by a uniaxial press, then cold isostaticaly pressed. The compacts were sintered by conventional sintering and capsule-free-Hot Isostatic Pressing (HIPing) at various temperatures between 1150 to 1500°C for 1h. Internal friction phenomena were evaluated by Q-1 obtained by resonance method. The value of Q-1 for conventional sintered samples were higher than that for HIPed ones at a given porosity and for a given Young's modulus. For the samples sintered at the same temperature, Q-1 showed a similar tendency. We reported previously that capsule-free-HIPing can enhance surface diffusivity by gas pressure. It is concluded that sintering process affects damping capacity on porous alumina, Young's modulus and damping capacity of porous alumina can be controlled independently by controlling the diffusion process.
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  • High Densification and Superconducting Properties of MgB2 by HIP Treatment
    Kunio Matsuzaki, Kotaro Hanada, Kanichi Hatsukano, Toru Shimizu, Satos ...
    2003 Volume 50 Issue 9 Pages 717-720
    Published: September 15, 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.717
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    A superconducting MgB2 compact was obtained by HIPing a rolled powder mixture of gas atomized Mg and amorphous B at a temperature ranging from 773 to 1073 K under a pressure of 150 MPa. It has been found that the HIP treatment promotes the formation and densification of MgB2. The MgB2 obtained by HIP at 773 K for 5 h shows a superconductivity at 38 K with a density of 2.1 Mg/m3 and a high Vickers pylamidal hardness of 1300 DPN. The superconducting transaction temperature of 23 K and dense structure is also obtained for the sample HIPed at a temperature as low as 873 K. Therefore, HIP is a useful way to prepare a superconducting MgB2 with a dense microstructure.
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  • Low Temperature Preparation of Ferrite Magnetic Materials by the Addition of a Little Amount of Boric Acid and Their Characteristics
    Pei Bian, Dong-Ying Ju, Takashi Mitamura
    2003 Volume 50 Issue 9 Pages 721-725
    Published: September 15, 2003
    Released on J-STAGE: December 04, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.721
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    Recently, magnetite (Fe3O4) of ferrite magnetic materials has attracted attentions arising from the scientific inter-est in clarifying material properties and its potential applications. However, its industrial applications have been limited by the need of high temperature (ca. 1500°C) sintering under reduced pressure or vacuum. So the purpose of this study is to fabricate the magnetite sintered body with high-strength and soft magnetism at relatively mild condi-tions. The manufacturing procedures are as follows: fine magnetite powder was synthesized under a CO2 atmo-sphere at 500°C from the oxalic acid iron by liquid phase sedimentation using iron chloride and ammonium oxalate; subsequently, a small amount of boric acid [H3BO3] was added to the powder, and then the magnetite powder com-pact was prepared with Newton press and CIP methods. Finally, the Fe3O4 sintered body was fabricated by sintering at 1050°C under a CO2 atmosphere which is lower in comparison with the traditional manner. By this method, we obtained magnetite sintered body with 0.5 mass% boric acid additive being of high strength (400 MPa), high satura-tion magnetization value and low coercive force.
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  • ERRATUM
    2003 Volume 50 Issue 9 Pages 727
    Published: 2003
    Released on J-STAGE: May 22, 2009
    DOIhttps://doi.org/10.2497/jjspm.50.727
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