金属表面技術
Online ISSN : 1884-3395
Print ISSN : 0026-0614
ISSN-L : 0026-0614
21 巻, 6 号
選択された号の論文の6件中1~6を表示しています
  • 安川 三郎
    1970 年 21 巻 6 号 p. 304-311
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
  • 金メッキの研究 (第2報)
    青谷 薫, 吉沢 勲, 大和田 健二, 千早 正, 野崎 忠次郎
    1970 年 21 巻 6 号 p. 312-319
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Physical properties and crystal structures of gold layers deposited from cyanide bath and citrate baths A and B in the previous paper are researched in this paper.
    The following results were obtained.
    1) Values of hardness, tensile strength, electric resistivity, and lattice constants of deposits obtained from the above baths were different one another among the three baths and also distinctly different from their bulk values. All values obtained in the deposits from cyanide bath and citrate bath A were nearly the same. However, all the values from citrate bath B were different from those obtained from the former two; the last gave higher hardness, higher abrasion resistance, lower electric resistivity, and less tensile strength than cyanide bath.
    2) The surface structure of gold layers from citrate bath B gave the highest smoothness and least pits.
    3) The crystal structures of gold layers obtained from the baths were nearly identical between cyanide bath and citrate bath A; except for the latter contained many twins and the former showed dislocation lines in crystal grains.
    Whereas, the deposits from citrate bath B showed internal stress, twins, and stacking faults in crystal grains.
    4) Correlation between physical properties and crystal structures were made clear, but some problems still remained unsolved.
  • 福島 敏郎, 福田 芳雄, 伊藤 伍郎, 佐藤 芳久
    1970 年 21 巻 6 号 p. 319-326
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Anodic oxidation of 99.99% aluminum sheets were conducted in solutions of several kinds of mono-carboxylic acids by applying d. c. of 1.87Amp/dm2. The concentrations of the solutions for baths were from 0.01mot/l to saturation and their temperature were from 20°C to boiling points.
    Porous and thick anodic oxide coatings were uniformly formed from formic acid bath at relatively high temperatures and concentrations. On the other hand, at low temperatures and concentrations, pittings occurred on the anode aluminum by local corrosion. It was found that uniform formic acid coatings possessed porous structures similar to those obtained from sulfuric acid bath and they were easily colored with organic dyestuffs.
    In the baths of other acids such as acetic, propionic, butyric, valeric, and benzoic acids, it was impossible to form uniform coatings and local corrosion of the anode was always observed.
    Microstructures of the pittings were investigated by microscopic examination and measurement of leakage current by the Hunter's method.
  • 炎溶射法によるチタン酸バリウム皮膜コンデンサの研究 (第11報)
    木村 生一
    1970 年 21 巻 6 号 p. 327-334
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    Semi-conductive barium titanate coating could be formed merely by flame spraying of barium titanate powder containing several wt. % of metal oxides. The additives giving the lowest resistivity of coatings (the order of 10-102ohm-cm) found at present included oxides of Sm, Nd, Ta and Nb. The minimum amounts of these oxides giving the lowest resistivity were generally in the range of 1.5-2.5wt. %, according to their kind, which were much larger than those in ceramic barium titanate.
    The PTC (Positive Temperature Coefficient) of resistance was observed for some kinds of oxides, but generally the gradient of resistance change with temperature was much slower than that in the conventional ceramic barium titanate.
    Heat treatment improved conductivity to a large extent and decreased the gradient of resistivity change with temperature for most of the oxides. The conduction mechanism is now believed to be the combination of valence control and a lattice defect such as oxygen defect for producing conductivity.
    The values of activation energy were varied in a wide range (within 0.01-0.35eV) according to kind of additives, conditions of heat treatment, and other factors.
  • 田辺 良美, 松林 宏
    1970 年 21 巻 6 号 p. 335-340
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
    The formation mechanism of single and poly-crystalline Au films, which had been obtained on iron substrate from electroless plating bath containing sodium hypophosphite as a reducing agent, was examined by direct observation and diffraction method of electron microscope.
    The following results were obtained:
    1) Au micro-particles of less than 100Å in size were observed in the early stage and no coherency was found between the micro-particles and iron substrate.
    2) When the Au micro-particles were coalesced and grew up to the size of about 130Å, coherency began to be found between Au-particles and iron substrate. However, there still remained a little misalignment of particles.
    3) The misalignment was gradually reduced with the growth of particles and it reached the minimum when the iron surface was completely covered with Au plate crystals, which turned into single-crystalline.
    4) The plate crystals again turned to poly-crystalline with the further lapse of plating time owing to the growth of particles having random crystal orientation in defects of the single crystals.
    5) The coherencies between the Au plate crystals and iron surface immediately after the surface was covered by the crystals were as follows:
    (001) Fe||(001) Au [110] Fe||[010] Au} (1) (110) Fe||(110) Au [001] Fe||[110] Au} (2)
    6) In the early stage, Au micro-particles were coalesced with no change of shapes: that is, they did not develop to network structure, different from those obtained by galvanic substitution.
    7) The maximum density of Au micro-particles in the deposits obtained by electroless plating was about 2.2×1012cm-2.
  • 内田 弘
    1970 年 21 巻 6 号 p. 341-346
    発行日: 1970/06/01
    公開日: 2009/10/30
    ジャーナル フリー
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