巻号一覧
1992 巻 (1992)
- 155 号 p. 282-
- 154 号 p. 213-
- 153 号 p. 149-
- 152 号 p. 67-
- 151 号 p. 2-
1992 巻, 154 号
選択された号の論文の7件中1～7を表示しています
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佐東 信司, 香山 晃1992 年 1992 巻 154 号 p. 213-219
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーRecent advancement of CMCs and MMCs demands new and precise methods to evaluate mechanical properties at very high temperatures. A lateral vibration type internal friction measurement apparatus by electrostatic capacitance method with an advanced high temperature capability was developed and applied to 2D C/C composites. From temperature dependence of internal friction up to 800°C, three internal friction peaks have been observed. These peaks were related with desorption phenomena of gases from the C/C specimens which were simultaneously measured, during the internal friction measurements. The hysteresis and time dependent behaviors of internal friction suggest the gas desorption from closed pores together with that from open pores.抄録全体を表示PDF形式でダウンロード (2204K) -
Kiyoshi Horita, Yukio Nagaosa, Hisaya Oki1992 年 1992 巻 154 号 p. 220-223
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーThe relations between the surface properties or the pore structure of acetylene black for the electrode material of a gas diffusion electrode and the performance of electrochemical reduction of oxygen in an alkaline solution have been investigated. This work also describes an interesting electrochemical behavior of the electrode with oxygen plasma treated acetylene black. It was found that one of the most important factors controlling the performance of a gas electrode with acetylene black was the wettability of the electrode and that the fine pores below 0.2μm diameter in the electrode played an important role to formation of stable three phase zone at which the electrode reaction occurs. By oxygen plasma treatment, acetylene black surface changed from hydrophobic to hydrophilic and had large hydrogen peroxide decomposition ability by which the electrode performance was appreciably improved.抄録全体を表示PDF形式でダウンロード (417K) -
吉川 高雄, 小島 昭, 大谷 杉郎1992 年 1992 巻 154 号 p. 224-230
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーPhoto-oxygenation has been recently developed for surface modification of carbon fibers (CF) as an atmospheric and dry method. It was found through the present work about carbon fiber reinforced cement (CFRC) and CF/phenolic resin composites that the improved degree on mechanical properties was as large as that by low temperature plasma treatment.
In this paper, mechanism of surface modification by photo-oxygenation and its influence on CFRP composed of CF-paper or CF-cloth and epoxy resin which is generally used as matrix resin have been studied. The results are as follows.(1) Surface modification by photo-oxygenation utilizes a synergist effect of ozone, ultra-violet rays and heat energy.(2) Wettability of photo-generated CF-paper has been remarkably improved over a period of 100 days.(3) Wettability of sized CF by photo-oxygenation is under the influence of size.(4) Flexural properties of CFRP made of photo-oxygenated CF-paper or CF-cloth are better than those of each as-received.抄録全体を表示PDF形式でダウンロード (1011K) -
松本 光昭, 樋口 雅一, 永田 保雄, 砂子 洋文1992 年 1992 巻 154 号 p. 231-237
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーShort-period variation of filament diameter was measured during melt-spinning of mesophase pitch using Laser-beam scanning diameter-measuring equipment. Filament diameter has been changing continuously owing to change of temperature of atmosphere under the nozzle. Frequency of oscillation of filament diameter was 10-20/s for a small disodering of temperature of atmosphere. Coefficient of variation of filament-diameter variation can be reduced when spinning is done in high viscosity or in high spinning velocity. But the low strength of pitch fiber almost limit to select such a mean.抄録全体を表示PDF形式でダウンロード (793K) -
諏訪 浩史, 小嶋 一夫, 早乙女 康人, 大谷 杉郎1992 年 1992 巻 154 号 p. 238-243
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーProcess conditions required to weave the pitch-based HMCF (High Modulus Carbon Fiber) cloth with combination weave were researched by use of a rapier loom. Then the relationships among a weaving ability of the fibers, the result of tension rubbing test and of loop strength test were investigated in order to find a simple method for the evaluation of weaving ability of the fibers. Finally the fiber properties which influence the results of both simple tests were discussed. The obtained results are summarized as follows:
1) The cloth with combination weave were prepared successufully by applying some ordinary regulation to the loom at the weaving speed less than 60cycles/minute. However some improvements of the loom were required to perform the further weaving speed.
2) The weaving ability of HMCF can be evaluated by the tension rubbing test.
3) Tension rubbing toughness of the fibers is influenced by their breaking elongation and modulus, especially the former, and the loop strength of the fibers seems to be controlled by their gathering ability.抄録全体を表示PDF形式でダウンロード (720K) -
稲垣 道夫, 石田 隆臣, 矢部 勝昌, 菱山 幸宥1992 年 1992 巻 154 号 p. 244-250
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーFour organic polymer films, Novax, Kapton, PPV and POD, which have been reported to give well-crystallized graphite, were compared in their carbonization behavior followedby the changes in weight, size, chemical composition and pyrolyzed gas composition. Also their graphitizability was characterized by magnetoresistance.
Polyimide films, Novax and Kapton, released their non-carbon atoms in two steps, as CO around 600°C and as N2 above 800°C, POD film did also in two steps, but in different composition, N2 and CO around 500°C and N2 above 800°C. The carbon yield of the polyimide films was very high, particularly in Kapton.
All of carbon films derived from these polymer films gave high values of magnetoresistance, that is, high degree of graphitization, after the heat treatment at 3000°C, particularly the one from Novax. During graphitization process, all films were elongated along their film surfaces, the one from PPV showing remarkable elongation.抄録全体を表示PDF形式でダウンロード (839K) -
阿久沢 昇, 寺井 隆幸1992 年 1992 巻 154 号 p. 251-261
発行日: 1992/09/30
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1431K)
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