巻号一覧
1997 巻 (1997)
- 180 号 p. 217-
- 179 号 p. 145-
- 178 号 p. 101-
- 177 号 p. 59-
- 176 号 p. 2-
1997 巻, 176 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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Ruoding Wang, Miki Yokota, Hideaki Sano, Yasuo Uchiyama, Kazou Kobayas ...1997 年 1997 巻 176 号 p. 2-7
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーOxidation behavior of LaB6-coated C/C composites heat-treated at 500°C and 2000°C was investigated. LaB6 began to oxidize at about 500°C and converted completely to the oxides at about 1300°C. In the flowing air, LaB6 converted to the stable oxides that were not catalytically active to the oxidation of the C/C composites. In case of soot treatment, LaB6 showed effective resistance against oxidation and this effect extended above 1000°C. In case of 2000°C treatment, the diffusion of lanthanum and boron on the surface of the C/C composite was detected by energy dispersion X-ray analysis. By X-ray quantitative analysis, it was suggested that the diffusion of lanthanum and boron enhanced the ordering of graphitic structure of carbon and lowered the active sites in the C/C composites. A particular effect of oxidation resistance was illustrated by oxidation kinetic analysis.抄録全体を表示PDF形式でダウンロード (4726K) -
芹澤 久, 佐東 信司, 綱川 英男, 香山 晃1997 年 1997 巻 176 号 p. 8-13
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーAs one of the most important basic mechanical properties of advanced C/C composites for high temperature structural applications, temperature dependence ofYoung's modulus was precisely studied from room temperature up to 1373K. Materials used were two kinds of unidirectional C/C composites, where the variables were microstructure of carbon fibers in C/C composites introduced by heat treatment prior to composite fabrication (denoted as prior heat treatment).Those composites were, then, heat treated between 1473K and 3073K (denoted as post heat treatment). Microstructural inspections were performed with X-ray diffraction analysis, TEM observation and Raman spectroscopy. The temperature dependence of Young's modulus showed positive and negative trends, i.e. two way temperature dependence, reflecting microstructure changes of carbon fibers by postheat treatments. For all the specimens, these temperature dependence could be written by a liner function of two typical specimens, in which the graphitization of carbon fiber were the lowest and the highest of all specimens. And the temperature dependence of Young's modulus was considered to be predictable from the results of Raman spectroscopy. Also the correlation between microstructure and Young's modulus was discussed together with the TEM results and thermal history during the fabrication of carbon fibers and C/C composites.抄録全体を表示PDF形式でダウンロード (996K) -
内山 休男, 荒木 伸二, 成 会明, 小林 和夫1997 年 1997 巻 176 号 p. 14-19
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーPetroleum coke with and without addition of 5 mass % LaB6 or MoSi2 was ground by alumina mortar for up to 100 h and then heat-treated at 1500 °C and 2500 °C for 1 h. The ground powders and the heat-treated powders were investigated by microscopy and X-ray analysis to clarify a change of morphology and structure of the powder. Electrical resistivity of sintered compact prepared from the ground powder was examined. Grinding treatment made the particle of the coke powder smaller and roundish up to 30 h independently of the additive. Dense sintered compacts were obtained from the ground powder, especially from the powder containing LaB6, at 2500 °C. The ground powder, whose structure was amorphous, had a tendency not to graphitize easily. By 1500 °C heat treatment, the additive had no effect on the structural change of the powder. On the other hand, addition of LaB6 caused an increase of interlayer spacing and a suppression of lowering in crystallite size by 2500 °C heat treatment. Addition of LaB6 or MoSi2 lowered electrical resistivity of the sintered compact obtained at 2500 °C.抄録全体を表示PDF形式でダウンロード (1339K) -
小田 廣和, 西本 敏幸, 木嶋 哲史1997 年 1997 巻 176 号 p. 20-25
発行日: 1997/02/28
公開日: 2011/07/05
ジャーナル フリーIn order to discuss the effect of surface acidity of activated carbons on its affinity coefficient for organic vapors, 7 kinds of carbons of different characters were used as adsorbent and adsorption isotherms were determined for 10 organic vapors and water. The results were obtained as follows. Analysing the isotherm for water adsorption with Dubinin-Serpinski equation revealed that acidic sites of activated carbon acted as the primary adsorption site for polar adsorbate. Affinity coefficient β was found to increase with the amount of acidity of activated carbon surface. β value could be estimated by molar volume of the adsorbents and the acidity with in a relative error of 6.2%. We showed that the adsorption capacitities of acitivated carbons for organic vapors could be evaluated by using Dubinin-Radushkevich equation with its characteristics parameter, β and k.抄録全体を表示PDF形式でダウンロード (873K) -
田邊 靖博, 佐々木 健一, 赤津 隆, 安田 榮一, 澤岡 昭1997 年 1997 巻 176 号 p. 26-28
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーAn electrode-grade polycrystalline graphite material, G151A, was used for impact test by a 4mm-diameter sphere made of Mn-Zn ferrite or steel. The impact velocity was 900m/s to 1700m/s. Influence of specimen thickness and projectile material on the initiated crater and spalling was investigated in this study. Material and thickness did not affect crater volume. However, crater area by Mn-Zn ferrite was larger than that by steel at the same kinetic energy. The spall area and the depth were almost constant in all the thicknesses when the material spalled.抄録全体を表示PDF形式でダウンロード (457K) -
鈴木 弘茂1997 年 1997 巻 176 号 p. 29
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1454K) -
土屋 広志1997 年 1997 巻 176 号 p. 31
発行日: 1997/02/28
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (205K)
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