金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
36 巻, 8 号
選択された号の論文の6件中1~6を表示しています
  • 日根 文男
    1985 年 36 巻 8 号 p. 313-318
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 野口 裕臣, 小谷 勇
    1985 年 36 巻 8 号 p. 317-323
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
    The effects of pulsed current on surface morphology, electrode potential, current efficiency, macrothrowing power and electrical power usage were studied by means of scanning electron microscopy, polarization measurement and Hull cell testing in ZnCl2-KCl and zincate baths, with and without additives.
    The grain size deposited from baths without additives decreased with increasing pulse current density and shorter duty-cycles under constant average current density, but bright deposits could not be obtained.
    In a chloride bath containing only a non-ionic surfactant (nonyl phenyl eicosa-ethylene glycol ether: NPEGE), however, a mirror bright surface was obtained under a wide range of current densities under appropriate pulse conditions.
    Pulsed plating had little effect on improving either current efficiency or macro-throwing power.
    At constant average current density, it was found that pulsed plating used more electrical power than direct current plating and this trend was more pronounced the shorter the duty-cycle. This is explained in terms of increased ohmic drop due to the electrical resistance of the solution.
  • チタナイジングに関する2,3の考察
    坂井 徹郎
    1985 年 36 巻 8 号 p. 324-329
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
    Literature published recently in the Soviet Union discusses diffusion coating treatment of alloys containing TiC in detail, but contains no information on the treatment of alloys consist of WC.
    A preliminary experiment involving titanizing of a WC-Co cemented carbide system was carried out to examine the applicability of the paste process to cemented carbides used for wood cutting tools.
    Research results obtained are summarized as follows:
    (1) The WC-Co cemented carbide system decreased in mass after titanizing. Mass loss increased with reduction of paste thickness, but increased with increase in the time of treatment due to oxidation or detitanization.
    (2) Hardness after titanizing increased with increases in paste thickness, temperature of treatment and time. Under optimum condition, surface hardness was improved remarkably.
    (3) The intermetallic compound formed were identified by X-ray diffraction pattern.
    (4) Transverse rupture strength, after titanizing increased with increases in the temperature of treatment but decreased with increases in treatment time.
    (5) Alloys low in Co content could be hardened to the some extent as well as iron and steel, but toughness was decreased by titanizing. It is recommended that Co content be increased to obtain alloys with greater toughness.
  • 西田 典秀, 横山 文雄
    1985 年 36 巻 8 号 p. 330-334
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
    Titanium nitride films of 2.4-2.7μm thickness were deposited on SUS 304 substrates by RF ion plating, and the effects of RF power (200-600W) and bias voltage (0- -300V) on their composition, surface morphology, spectral reflectance and knoop hardness were studied. Increases in RF power and bias voltage both exerted similar effects on film properties, producing lower oxygen content, smoother surface morphology, and greater spectral reflectance and hardness. These effects are explained in terms of an increase in the ions reaching the substrate.
  • 星野 重夫, 今村 武夫, 松本 誠臣
    1985 年 36 巻 8 号 p. 335-339
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
    It is well known that the thickness of anodic oxide films on Al formed at low current densities is limited by chemical dissolution of the films in the bath during anodization. On the other hand, when anodizing at high current densities, the occurrance of burning limits the film thickness, which decreases with increasing current density.
    Based on the above facts, the maximum film thickness obtained under galvanostatic anodization was analyzed and calculated using both the chemical dissolving rate for oxide films and the burning occurrance curve. It is theoretically and experimentally demonstrated that the critical thickness of oxide film can be formed on Al only by using a high speed anodizing process, in which, after initial galvanostatic anodization at high current density, current density decreases with time along the burning occurrance curve.
  • 鄭 容宝, 渡辺 信淳, 田中 則之
    1985 年 36 巻 8 号 p. 340-343
    発行日: 1985/08/01
    公開日: 2009/10/30
    ジャーナル フリー
    Tungsten carbide films were prepared at 300-700°C from a WF6+H2+C6H6 reaction system. W3C films were obtained at 300°C, and W2C films at 450°C. Hardnesses were as high as 2500-3000HmV.
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