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 58, Issue 8
August
Displaying 1-9 of 9 articles from this issue
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Paper
Paper
  • Tool Wear of (Al, Cr)N Coated Cemented Carbide in Cutting Sintered Steel
    Tadahiro Wada, Koji Iwamoto, Hiroyuki Hanyu, Kinya Kawase
    2011 Volume 58 Issue 8 Pages 459-462
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.459
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    The tool life in turning sintered steels becomes shorter than that in turning of melted steels such as carbon steels. In order to clarify an effective tool material for the cutting of sintered steel, the tool wear was experimentally investigated. The sintered steel was turned with two kinds of PVD coated cemented carbide tools. The coating films used were (Ti, Al)N and (Al, Cr)N. (Al, Cr)N is a new type of coating film. The main results obtained are as follows: (1) The wear progress of (Al, Cr)N coated cemented carbide tool was slower than that of (Ti, Al)N coated cemented carbide tool. (2) The (Al, Cr)N coating film exhibited both higher hardness and higher oxidation temperature. (3) In case of cutting sintered steel with (Al, Cr)N coated cemented carbide tool, it is considered that because the coefficient of friction of the (Al, Cr)N coating film is lower, the cutting temperature becomes lower, and the wear progress became slower.
    As mentioned above, it was clear that the (Al, Cr)N coated cemented carbide is an effective tool material in cutting sintered steel.
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  • Formation of Zirconia Films by the Aerosol Gas Deposition Method (By Jetting of Positive Charged Powder)
    Eiji Fuchita, Eiji Tokizaki, Eiichi Ozawa, Yoshio Sakka
    2011 Volume 58 Issue 8 Pages 463-472
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.463
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    The aerosol gas deposition method (AGD) is a low temperature method. No heating procedure exists in the AGD process during the formation of the AGD films. We can form even ceramic films by using AGD method. However, the mechanism of synthesizing ceramic film has not been made clear until now. This paper is the first trial to clarify the mechanism by using two kinds of zirconia powder. The experimental results indicated that in wet type zirconia powder the film could be formed in the limited conditions of diameter and the specific surface area of powders although in dry-milled zirconia powder all powders used could form the films. At the same experiments we observed the high temperature phase of zirconia in the film and a light emission phenomenon at the deposition site during AGD process. In this paper, we discuss the formation mechanism of the AGD film at the ambient temperature correlating with the film formation condition, the appearance of the high temperature phase and the light emission.
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  • Open-Cell High-Porosity Porous Aluminum Material Sintered in the Magnesium Vapor
    Kenji Date
    2011 Volume 58 Issue 8 Pages 473-479
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.473
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    The effect of Mg vapor on Al sintering process has been investigated to manufacture open-cell high porosity porous Al material by Space Holder Method. It was found that Al-Mg oxide particles of 50-100 nm in size and exposed Al matrix were formed on the surface of Al sintered in Mg vapor. When the sintering temperature was higher than 915 K, droplets were formed below the melting point of Al, 933 K. It was supposed that Mg in sintering atmosphere could diffuse into Al powder surface and transform Al oxide film into Al-Mg oxide particles and exposed Al matrix by reduction, furthermore Mg diffusing into exposed Al matrix could lower the solidus and liquidus temperature of Al powder surface area and form liquid regions. These phenomena are effective for Al sintering process without forming excessive amounts of liquid. A temperature range of 905-910 K was suitable for sintering porous Al material in Mg vapor conditions of this work. Open-cell porous Al sheet with 88 % porosity and no inclusions in the neck boundary was obtained.
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Special Issue: Progress and Research Problems of Hard Materials Part II
Paper
  • Fabrication of TiB2-(Fe-Al) Cermets by Short Time Pulsed Current Sintering
    Hiroyuki Nakayama, Keizo Kobayashi, Kimihiro Ozaki
    2011 Volume 58 Issue 8 Pages 483-486
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.483
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    Short time fabrication of TiB2-30mass% Fe3Al cermet was performed by pulsed current sintering method. Milled powder mixture of TiB2, Fe and Al was consolidated using a pulsed current of 0 A-1000 A with 50 % duty ratio for 50 s with 1, 10 and 100 Hz frequency. Microstructures, densities and phases present in the cermets fabricated in such a way were examined. TheTiB2-30mass% Fe3Al cermet without formation of Fe2B was successfully fabricated. Increase in the pulse frequency led to an increase in the sample density and homogeneous distribution of TiB2 particles.
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  • Production of Hard Materials with Ubiquitously Fe-B System by Spark Sintering and their Characteristics
    Kazuhiro Matsugi, Kensho Tomigahara, Yong Bum Choi, Gen Sasaki, Masahi ...
    2011 Volume 58 Issue 8 Pages 487-494
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.487
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    The spark sintering technique was utilized to fabricate ubiquitously hard-materials compacts which were 0, 10 and 50vol%Fe added (hereafter called, 100, 90 and 50%FeB, respectively) in as-received powders with mean composition of Fe-19.1wt%B. Rockwell hardness number on C scale was changed 63 to 70 depending on Fe contents, and the value of 100%FeB compact was the same as that of WC-7.8Co. The 100 and 90%FeB compacts showed the fracture strain of 0.32 and 0.41 %, or fracture stress of 212 and 133 MPa, respectively, in three points bending tests at room temperature. The 100%FeB compacts had the same level in fracture stress and increment of 0.1 % in fracture strain at 773 K, compared with those obtained from the bending tests at room temperature. Dynamic friction coefficient of 90 and 100%FeB compacts was lower than that of WC-7.8%Co in pin (SK2) on disk configuration. Same values were shown in both wear loss on specimens (100%FeB or WC-7.8%Co), and SK2, which meant the similar level in these compacts for the cutting performance as the tool materials. The value of flank wear width (VB) was 0.26 mm at cutting distance of 30 m for the work material of Ti-6Al-4V using the cutting tool of 100%FeB, which meant the satisfaction for its standard value of 0.3 mm as the life of tools.
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  • Effects of Chromium and Molybdenum Contents and Heat Treatment on Behavior of Complex Boride Forming in Ni-Cr-Mo-B Gas Atomized Powder
    Toshiyuki Sawada, Katsu Yanagimoto
    2011 Volume 58 Issue 8 Pages 495-499
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.495
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    The effects of Cr and Mo contents and the heat treatment on the properties of gas atomized powders with Ni-Xmass%Cr-Ymass%Mo-1.5mass%B compositions ((X, Y)=(10, 36), (22, 26), (34, 16)) were investigated. Examined powders were produced by gas atomization, followed by sieving under 150 μm. These powders were heat treated at various temperatures to investigate its effect.
    As a result, tetragonal M3B2 and tetragonal M5B3 type complex borides were observed in examined powders before and after heat treatment. Compositions and crystal structures of complex borides varied depending on Cr and Mo contents in examined powders and compositions of Ni-based matrix phases also varied. Vickers hardness after 1473 K heat treatment increased with increasing the Mo/Cr ratio of examined powder.
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  • Preparation for WC-FeAl Hard Metal by Vacuum Sintering
    Kiyotaka Katou, Akihiro Matsumoto, Sun Zheng Ming, Koji Shimojima, Hir ...
    2011 Volume 58 Issue 8 Pages 500-505
    Published: 2011
    Released on J-STAGE: November 29, 2011
    DOIhttps://doi.org/10.2497/jjspm.58.500
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    The preparation for WC-FeAl hard metal by vacuum sintering was investigated. The mixture of WC and FeAl (Fe-40at%Al) powders which composition was WC-25vol.%FeAl were treated by wet-milling for 70 hr. The average particle size of the powder mixture decreased from 4.2 μm to 1.1 μm by wet milling. The powder mixtures before and after wet milling were press-molded into the test-piece and sintered in vacuum of 10-2∼10-1 Pa order at various temperature for 1 hr. The densities, microstructures and mechanical properties of the obtained sintered compacts were investigated. When powder mixture after wet milling was used, the compact sintered at 1450°C had the good relative density of 98.0 %, Vickers hardness of 1350 HV and transverse rapture strength of 2.0 GPa. By the EPMA observation, it was cleared that homogenity of microstructure enhanced by wet milling.
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