巻号一覧
31 巻, 9 号
選択された号の論文の6件中1～6を表示しています
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長坂 秀雄1980 年 31 巻 9 号 p. 464-469
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (1463K) -
源馬 国恭, 河上 護1980 年 31 巻 9 号 p. 470-475
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーCase-hardening of SUS 430 stainless steel was attempted in the mixed gas of NH3 and RX-gas over the temperature range of 823-973K without the removal treatment of surface oxide films on the steel. The results were as follows; (1) Uniform hardening layers were formed on the steel in the mixed gas of NH3 and RX-gas at a dew point of 253K or below. (2) The mixed gas containing 30% NH3 gave a layer of maximum thickness and its maximum hardness showed about Hv1400 with a microvickers hardmeter. (3) Line-analysis of hardening layers by EPMA showed that carbon was concentrated in a thin layer with 10-15μm in thickness under the surface of the steel and that nitrogen diffused into the bulk of the alloy and that the peaks of N Kα and Cr Kα agreed each other in their positions. These data show that a Cr-nitride was formed in the hardening layer and that the dispersion of this nitride particles with in the alloy plays a role on the increase in hardness of the layers.抄録全体を表示PDF形式でダウンロード (2044K) -
掛川 正幸, 見崎 吉成, 田辺 良美1980 年 31 巻 9 号 p. 476-481
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーNickel-TiH2 composite coatings were produced by electrodepositing nickel from a sulphamate bath containing TiH2 particles (1-5μm) in suspention. The influence of the concentration of suspended TiH2 particles and current density on the formation of electrodeposited composite coatings was investigated. In addition, the microstructure of the composite coatings annealed at 1, 000°C for 2hrs in vacuum was studied by means of electron microscope. It was found that the amount of TiH2 in the nickel deposits increased with increasing the concentration of TiH2 in the electrolyte up to 100g/l; beyond this concentration, the amount remaind almost constant. At high concentrations of TiH2 in the electrolyte the amount increased slightly with increasing current density. By the heat treatment of the composite films the TiH2 particles in the nickel matrix were transformed into new fine particles (0.03-0.3μm) which differed from TiH2, and these particles were uniformly dispersed in the matrix. The degree of crystallization and grain growth of the matrix at higher temperatures were remarkably retarded as compared with those of pure nickel in the presence of the dispersed fine particles.抄録全体を表示PDF形式でダウンロード (3971K) -
玉井 康勝, 森 誠之1980 年 31 巻 9 号 p. 482-486
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーThe mechanochemical effect on the nature of zinc phosphate coatings formed on sand blasted mild steels was examined. From X-ray diffraction studies, the coatings were determined as hopeite. The weight of coating on the sandblasted steel was three times as large as that formed on the original, and small crystals were deposited on the sandblasted steel with large density. When the sandblasted steel was exposed to air for 2min-1440min, the number of crystals per unit area was decreased and the crystals were grown. This result suggests that the mechanochemical activity of the sandblasted surface was reduced on exposure to air. The emission intensity of exoelectron from the sandblasted steel was also decreased with exposure time. It is suggested from a fairly good coincidence of the surface density of crystal with the emission intensity of exoelectron that the exoelectron phenomena can be applied to an indirect determination of the mechanochemical activity of sandblasted steels.抄録全体を表示PDF形式でダウンロード (1546K) -
久米 道之1980 年 31 巻 9 号 p. 487-491
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーThe electrodeposition of Al on Cu was conducted from a bath consisting of AlBr3 and a mixture of m-xylene and ethylbenzene. The optimum bath composition and plating conditions were determined on the basis of the surface appearance of deposit, cathodic current efficiency and electrolyte conductance as follows: m-xylene/ethylbenzene=4 (vol. ratio), AlBr32-2.5mol/l, bath temperature 15-25°C and cathodic current density 1-2A/dm2. Silver white and adhesive deposits without dendrites were obtained after pre-electrolysis of 3A·h/l under the above conditions at cathodic current efficiencies of more than 80% and at anode efficiencies approaching 100%. The small differences in the reversible potentials between Al and various metals found in the aromatic hydrocarbon electrolyte indicate that this organic solvent system should be useful for Al alloy deposition.抄録全体を表示PDF形式でダウンロード (1377K) -
新居 和嘉1980 年 31 巻 9 号 p. 492-500
発行日: 1980/09/01
公開日: 2009/10/30
ジャーナル フリーPDF形式でダウンロード (2036K)
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