巻号一覧
1994 巻 (1994)
- 165 号 p. 255-
- 164 号 p. 193-
- 163 号 p. 115-
- 162 号 p. 61-
- 161 号 p. 2-
1994 巻, 161 号
選択された号の論文の8件中1～8を表示しています
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丸山 勝久, 牧野 光男, 菊川 伸行, 白石 稔1994 年 1994 巻 161 号 p. 2-9
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーTwo kinds of diamond film were synthesized on Mo substrates using a plasma jet method, in which methane was injected as a reactant gas into the hydrogen plasma. One (type A) was cubic diamond film with clear habit planes, the other (type B) film with no habit plane. The latter was consisted mainly of a mixture of many kinds of higher hexagonal diamond polytypes, and deposited at a maximum growth rate of 250μm·h-1. These were determined through analyses of X-ray diffraction and selected-area electron diffraction patterns, and scanning electron microscopic observation.
In order to find growth conditions for hexagonal diamond polytypes, we also synthesized the diamond film at the different temperature gradients of boundary layer above Mo substrates using an arc plasma reactor. It became clear that the polytypes were synthesized when the temperature gradient was greater than the gradient at which cubic diamond was synthesized.
We also studied on the orientation of the hexagonal diamond polytypes deposited on the substrates, and suggested a growth model of the polytypes.抄録全体を表示PDF形式でダウンロード (1466K) -
堀田 紀好, 西堀 寧1994 年 1994 巻 161 号 p. 10-14
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーThe surface properties of acetylene black (AB) treated with elemental fluorine or nitric acid have been investigated. An interesting electrochemical behavior of the electrodes with the surface modified ABs has also been discussed from polarization and continuous discharge measurements of oxygen reduction in an alkaline aqueous solution. The results obtained are summarized as follows: By nitric acid treatment, AB surface changed from hydrophobic to hydrophilic and high ability for hydrogen peroxide decomposition because of the increase of surface funtional groups containing oxygen. It was found that the AB treated with fluorine had larger surface area and wettability than those of non-treated one. Oxygen electrodes using the surface-modified AB showed good polarization behavior, because of favorable wettability which was effective to hold stable three phase zone. The stability and the life of electrode were examined in a continuous discharge experiment. As a result, the electrode fabricated from AB treated with fluorine was the most stable and had a long life. That from AB treated nitric acid also exhibited good discharge performance though it was low in its mechanical strength.抄録全体を表示PDF形式でダウンロード (610K) -
小林 和夫, 舟橋 博幸, 佐野 秀明, 成 会明, 内山 休男1994 年 1994 巻 161 号 p. 15-22
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーInfluence of boron-doping through different methods was investigated on d-spacing and apparent crystallite size, and oxidation resistance of carbon fibers with different microstructure. With diffusion of boron into carbon fiber, d (002) spacing decreased and crystallite size, Lc (002) , increased. However, the change of the X-ray parameter was different among carbon fibers with different microstructre. Many small grains of precipitates were formed on fiber surface by reaction of carbon and boron in the cases of using B2O3 or B4C powder as boron-dopant. With formation of the precipitates, degradation in strength was observed and the degradation was considered to be due to formation of defects around the precipitates. In all cases, weight-loss curve with oxidation temperature shifted about 50-150°C to higher temperature side than those of non-doped fibers. However, formation of pits by oxidation was observed for the carbon fiber boron-doped by B2O3 and B4C powder method. However, formation of precipitates and defects were not so remarkable on the surface for the fibers boron-doped with vapor deposition method, and this suggested that homogeneous boron-doping is preferable to improve oxidaation resistance of carbon fiber.抄録全体を表示PDF形式でダウンロード (6225K) -
星井 進介, 小島 昭, 下田 光春, 大谷 杉郎, 佐藤 佐, 中井戸 靖明, 長谷川 良雄1994 年 1994 巻 161 号 p. 23-30
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーDiphenylborosiloxane (PBS), a kind of organometallic compound, is synthesized from diphenylsilanediol and boric acid. PBS with high boron content was prepared by setting their mole ratio at 1: 1 (Si/B=3/3).
With the PBS obtained, specific gravity, molecular weight, and infrared absorption spectrum were measured. For the ratio of Si/B=3/3, molecular weight was 453, and Si content was 7.2wt%. The infrared absorption spectrum showed a larger absorption by B-OH bond than in case of Si/B=3/1 or 3/2.
Using PBS, carbon fiber (CF) and SiC powder (40wt% in acetone solution), CF/ceramics composites were prepared. Their mechanical properties, oxidation resistance, and crystal structure were investigated. Composite prepared from PBS with the ratio of Si/B=3/3, showed a bulk density of 1.32g/cm3, a bending strength of 220MPa, and Young's modulus of 30GPa. Microscopic observation by SEM recognized the formation of vitreous oxidation-resistant protective covering, which improved the oxidation resistance of composites. X-ray diffractometry gave diffraction patterns for B2O3 as well as carbon and β-SiC, and a pattern for B4C turned up by heat treatment at a high temperature of 2000°C.抄録全体を表示PDF形式でダウンロード (4871K) -
遠藤 三郎, 吉川 高雄, 小島 昭, 大谷 杉郎1994 年 1994 巻 161 号 p. 31-34
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーThere is a method, named photo-oxygenation, of surface modification treatment, which utilizes a synergist effect of ultra-violet rays and ozone. A functional group involving oxygen is induced on surface of carbon fiber. Wettability to water, phenolic and epoxy resin of carbon fiber surfacemodified by photo-oxygenation can be improved. Mechanical properties of CFRP and CFRC made of surface-modified carbon fiber are remarkably better than those of them made of carbon fiber asreceived. Properties of CFRP made of epoxy resin change in color and dynamic visco-elastic property.
In this report, we study the influence of the functional group on curing behavior of epoxy resin and mechanical properties. The results are as follows.(1) Apparent activation energy of epoxy resin in curing is proportional to O/C value (the ratio of oxygen to carbon content).(2) Strength of CFRP is able to be changed by controlling O/C value.抄録全体を表示PDF形式でダウンロード (511K) -
塩山 洋1994 年 1994 巻 161 号 p. 35-37
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーThe intercalation of AlCl3 into graphite in the presence of a chlorinating agent is investigated. Instead of using chlorine, N-chlorosuccinimide was added in the conventional reactor, in which AlCl3 and graphite were heated. At elevated temperatures (115-200°C), N-chlorosuccinimide was pyrolyzed to evolve chlorine gas and hence AlCl3 became feasible to be intercalated into graphite. By use of this novel method, stage 1, 2 and 3 AlCl3-GICs can be prepared.抄録全体を表示PDF形式でダウンロード (286K) -
さらなる新しい技術への展開に向けて佐藤 公隆, 佐藤 文廣, 富岡 紀夫1994 年 1994 巻 161 号 p. 38-50
発行日: 1994/02/28
公開日: 2010/06/28
ジャーナル フリーIn the present review, technological history from the original development by Otani and Singer to now is put in order as each generation and the expected cource of its future development is discussed for the high performance pitch-based carbon fiber by changing the standpoint as shown in the previous paper (Part 1; TANSO 1993 [No.157] 107). Moreover, the scheme to further new and higher level technology is also proposed about the following three technological subjects; (1) characteristics of mesophase pitch and its behavior of fiber formation, (2) bahavior of spinning and stabilization in fiber formation and their microscopic crystal structure, and (3) bahavior of surface and interface in carbon fiber and its composite materials.抄録全体を表示PDF形式でダウンロード (5110K) -
1994 年 1994 巻 161 号 p. 50
発行日: 1994年
公開日: 2011/03/01
ジャーナル フリーPDF形式でダウンロード (111K)
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