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1995 巻 (1995)
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1995 巻, 166 号
選択された号の論文の10件中1～10を表示しています
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星井 進介, 小島 昭, 大谷 杉郎, 中井戸 靖明, 長谷川 良雄1995 年 1995 巻 166 号 p. 2-7
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーCarbon fiber/Carbon composite (C/C) was coated with borosiloxane (PBS), an organometallic compound, and heat-treated to form an oxidation preventing film, with the aim of improving the oxidation resistivity. Coating of PBS on C/C was studied by two ways, immersion method and PBS melting method. Oxidation resistivity of C/C coated with PBS was evaluated by measuring the starting temperature of weight loss in thermogravimetric analysis. Of these two methods, PBS melting marked greater improvement of oxidation resistivity.
For the C/C coated by PBS melting, starting temperature of weight loss shifted upward by 200°C. After the thermogravimetric analysis up to 1000°C, it was recognized that C/C had partly remained without burning completely. Oxidation resistivity of PBS-coated C/C was also examined by SEM observation of the sample after its thermal analysis, and by X-ray diffractometry of the film.
The reason for improving the oxidation resistivity of C/C by PBS coating is considered because of the following two points.(1) Oxidation resisting film was formed on the surface of C/C.(2) Diffusion of silicon take place on the interface between C/C and PBS, which caused the ceramification of C/C itself.抄録全体を表示PDF形式でダウンロード (2385K) -
Adsorption Behaviors of Azulene and Phenol on Surface-Modified Activated Carbons in Organic SolventsShangyu Gao, Seiki Tanada, Ikuo Abe, Mutsuo Kitagawa, Yosiharu Matsuba ...1995 年 1995 巻 166 号 p. 8-13
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーThe effect of the surface acidity of activated carbons on the adsorption of organic solutes in organic solvents was examined. Several activated carbons with differentsurface acidity but with the same porosity were prepared by oxidation of commercial activated carbon with nitric acid and heat treatment in hydrogen gas. The adsorbability of azulene, as a nonpolar solute, and phenol, as a polar solute, was measured on the surface-modified activated carbons in organic solvents of different polarities.
The adsorbability of azulene decreased with decreasing solvent polarities and showed the lowest value in chloroform, but then increased with further decreasing solvent polarities. Similar behavior was also observed with phenol, though the magnitude of the decrease in the adsorbability was lower, and its adsorbability showed the lowest value in 1-octanol.
The adsorbability increased with increasing surface acidity for both azulene and phenol, because increase in the carbon surface acidity caused a decrease in the affinity of the solvent for the activated carbon. The influence of the carbon surface acidity on the adsorption of azulene was larger than that of phenol.抄録全体を表示PDF形式でダウンロード (596K) -
泉 順, 大手 丈夫, 加藤 正明, 大谷 杉郎, 小島 昭1995 年 1995 巻 166 号 p. 14-18
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーWe discussed heating effects of carbon material in modifying its surface with tetrafluo-romethane (CF4) plasma. The contact angle of water on the carbon material surfaces before and after the plasma treatment was measured to estimate the modification effects by plasma and their change with elapsed time was investigated. The carbon material surfaces were observed by scanning electon microscopy. From these results, the following conclusions could be drawn.
The elapsed change of the surface contact angle on the glassy carbon could be extremely minimized by heating its carbon at 400°C in modifying it by CF4 plasma. This may cause due to the introduction of only the covalent bond type fluorine, which is insoluble in water, stable to heat and difficult to secede from the surface, by heating the glassy carbon at 400°C when it was treated by CF4 plasma. It was seen that the value of the contact angle at 10 minutes after CF4 plasma treatment in heating it was almost constant, which is about 130°, even if the heating temperature varied from 0°C to 400°C. The surface morphology of the glassy carbon treated by CF4 plasma as it was heated, was revealed to become a little more sharp and irregular by etching in comparison with that of the glassy carbon treated by CF4 plasma without heating it.抄録全体を表示PDF形式でダウンロード (2348K) -
鏑木 裕, 吉田 明, 菱山 幸宥, 永田 康久, 稲垣 道夫1995 年 1995 巻 166 号 p. 19-27
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーHigh quality graphite films have been prepared from carbonized aromatic polyimide films by short time heat treatment at 3100 and 3200°C without any pressurization. The starting materials were Kapton and Novax with 25μm thick and a high-modulus polyimide film (PPT), prepared via polyamic acid gel, with 45μ thick. Microtexture and crystallinity of these graphite films were investigated by the measurements of X-ray diffraction, residual resistivity ratio (RRR), magnetoresistance and Hall coefficient at temperatures of 77 and 4.2 K, and by the observation of electron channeling contrast image in scanning electron microscope. From these experiments, interlayer specing d002, mosaic spread MS, magneto-resistance anisotropy ratio r, mean free path of majority carriersλ at 4.2 K and mean crystal grain size D were evaluated for the graphite films. The graphite films showed high crystallinity (d002=0.3354 nm and RRR=2.67-3.45), and were found to consist of large crystal grains (D=8μm), which were well oriented parallel (MS=5.7-6.9°and r=0.0113-0.0173). Especially, the graphite films prepared from Kapton and PPT showed the highest reported values of maximum transverse magnetoresistance (Δρ/ρ) max at 77 K in the field of 1T (12.54 and 12.06, respectivily), and their λ values were also large (3.5 and 2.6μm, respectively). They exhibited Shubnikov de-Haas oscillation at 4.2 K in (Δρ/ρ) max and very clearly in RH. These results obtained indicate that the graphite films can be comparable with highly oriented pyrolytic graphites or high quality pyrolytic graphites in crystallinity.抄録全体を表示PDF形式でダウンロード (4143K) -
山本 祐嗣, 井沢 一, 澤田 吉裕1995 年 1995 巻 166 号 p. 28-33
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーThe testing method of the fracture toughness and the fracture behavior of a C/SiC composite are addressed. Within the composite, carbon and SiC phases are interminingling in a three-dimensional network structure. The results are as follows;
(1) The SEPB method (JIS R 1607) is not adaptable to the C/SiC composite because of the incapability of pop-in precracking.
(2) The SENB method using a razor blade with or without diamond paste is not suited for the C/SiC composite because a sharp notch is not easily introduced.
(3) The apparent fracture toughness values of the composite by the use of diamond bladeintroduced notches with different notch-tip radii correlate well with the radii. It is found that the notch-root radii which give the true Kic (=2.0MPa·m1/2) are less than 6μm. It is concluded from the zigzag path of crack extension observed that a major possible mechanism for toughening may be the crack deflection.抄録全体を表示PDF形式でダウンロード (4817K) -
室山 勝彦, 林 順一, 竹本 晋1995 年 1995 巻 166 号 p. 34-39
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーIn an effective utilization of bean-curd refuse we tried to produce activated carbon from bean-curd refuse by chemical activation with ZnCl2. We examined the influence of production conditions such as carbonizaton temperature, holding time and impregnation ratio on the pore structure of activated carbon produced.
The surface area of the activated carbon produced were calculated from the N2 adsorp-tion isotherms data by BET method. The maximum surface area was obtained for the activated carbon produced at a carbonization temperature of 550°C for holding time of 60min. The surface area increased with an increase of impregnation ratio in the range of impregnation ratio up to 0.87 and this resulted from the development of micro-porosity. However at an impregnation ratio beyond 0.87, meso-porosity were developed and therefore the surface area increased a little. We could succeeded to produce the activated carbons with surface area more than 1000m2/g from bean-crud refuse by the chemical activation.
We found that ZnCl2 changed caronization behavior of bean-curd refuse in the temperature range of 200 to 400°C and that the activated carbon with high surface area was produced.抄録全体を表示PDF形式でダウンロード (686K) -
向後 保雄, 八田 博志, 大蔵 明光, 藤倉 正国, 清宮 義博1995 年 1995 巻 166 号 p. 40-46
発行日: 1995/03/08
公開日: 2011/07/05
ジャーナル フリーFlexural and interlaminar shear properties of carbon fiber reinforced carbon (C/C) composite, fabricated by “the preformed yarn method”, were evaluated at elevated temperatures up to 2300°C in vacuum. Four point flexure test and short beam test were carried out on the C/C composites of unidirectional, cross-ply and quasi-isotropic laminates. Effect of absorbed gas on the composite strength was also studied. The results revealed that flexural strength increase with increasing temperature, and was not profoundly affected by absorbed gas. On the other hand, interlaminar shear strength (ILSS) was remarkably lowered by absorbed gas at room temperature, and the test on the degased specimen showed that ILSS was kept constant up to 2300°C. Hence the absorbed gas is shown to lower matrix strength but not fiber strength. Young's modulus of C/C composites was kept constant up to 1500°C, then decreased at 2000 and 2300°C, that might be originated form temperature dependence of the Young's modulus of the carbon fiber.抄録全体を表示PDF形式でダウンロード (3576K) -
北島 正弘, 浅利 栄治, 中村 一隆1995 年 1995 巻 166 号 p. 47-54
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーWe describe new results of kinetic study on lattice disorder and its thermal realxationof graphite under ion irradiation, using real-time Raman measurements. Time dependent observation reveals a transient strucural change in graphite under ion irradaition. Lattice disorder in an early stage of irradiation is expalined in terms of a reduction in the phonon correlation length due to defects produced by ion irradiation. Thermal-relaxation rate of the lattice disorder is also discussed, considering defect annihilation processes.抄録全体を表示PDF形式でダウンロード (968K) -
先進複合材料への新しい用途展開佐藤 公隆, 久保村 健二, 佐藤 文廣1995 年 1995 巻 166 号 p. 55-64
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーHigh performance pitch-based carbon fiber that makes ingenious use of the mesophase phenomenon that appears in highly refined pitch (optically anisotropic pitch) has been improved in quality in recent years, particularly in Japan. A process is now established for manufacturing high performance carbon fiber with a high strength of 4.0 GPa and a small diameter of 7μm.
Development of applications for the new carbon fiber is focused here. The carbon fiber is used as primary fabricated products, such as resin compounds and resin prepregs, and as new composites, such as high-stiffness industrial rolls, high-capacity and high-speed press cross bars, various construction materials, rolling stock parts (body, truck and brake lining parts), and automoble propeller shafts. Railroad, automotive, aerospace, marine and shipbuilding, civil engineering and construction, energy, nuclear power, medical and other industrial applications in which the carbon fiber is expected to find increasing usage are also described.抄録全体を表示PDF形式でダウンロード (5840K) -
H-IIロケットで打ち上げたOREXにはどうようにカーボンが使われているのか芳仲 敏成, 弓立 浩三, 森野 美樹1995 年 1995 巻 166 号 p. 65
発行日: 1995/03/08
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (168K)
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