巻号一覧
1995 巻 (1995)
- 170 号 p. 247-
- 169 号 p. 201-
- 168 号 p. 149-
- 167 号 p. 89-
- 166 号 p. 2-
1995 巻, 170 号
選択された号の論文の15件中1～15を表示しています
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安田 榮一, 鈴木 義雄, 井上 裕嗣, 井沢 一, 江波戸 修, 高野 茂, 木原 健滋, 近藤 明, 大川 雅行, 平岡 利治, 嶋田 ...1995 年 1995 巻 170 号 p. 247-254
発行日: 1995/12/25
公開日: 2011/07/05
ジャーナル フリーThe effects of ozone treatment against carbon fiber on the properties of carbon fiber and on the microstructural change of pitch derived carbon matrix composite were investigated. Surface treatment of PAN based and pitch based carbon fibers were carried out by using 4% ozone at 110°C 8 hours. Surface oxidation was proceeded continuously, and it was recognized that fine ditches and functional groups were introduced on the fiber, however obvious degradation of tensile strength was not observed. Surface treatment increased the bonding strength between fiber and pitch derived carbon matrix, then debonding or pealing off was not observed. High density and low contents of closed pore were attained. Especially, in cas of pitch derived carbon fiber it was difficult to distinguish the carbon fiber and the matrix carbon.抄録全体を表示PDF形式でダウンロード (6591K) -
中島 剛, 南葉 道之1995 年 1995 巻 170 号 p. 255-258
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーHighly fluorinated graphite has been prepared in anhydrous liquid hydrogen fluoride con-taining a Lewis acid. The products were stage 1, C2.4F-C2.0F with α-axis lattice parameters, a0=0.2470-0.2473nm. It was found that MoF6 is more effective than SbF5 as an oxidizer of graphite and the relatively low temperatures such as 8 to 18°C are preferable to yield the CxF samples with large a0 values. The C15 and F1s binding energies of C2.4F to C2.0F were higher than those of stage 1+2, C2.7F-C4.4F, and almost constant with a0 values between 0.2470 and 0.2473nm.抄録全体を表示PDF形式でダウンロード (470K) -
第1報: 不純物濃度および気孔率の影響山本 修, 樋浦 寛子, 笹本 忠, 稲垣 道夫1995 年 1995 巻 170 号 p. 259-265
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーThe metal carbide layer on the surface of the carbon substrates was prepared by silicon and chromium impregnation. The effect of the porosities and impurities of the carbon substrates on the formation of the metal carbide layer was investigated.
(1) In the substrates reacted with Cr powder at 1450°C for 3h, the chromium carbide layer formed on the surface of the substrates with a porosity of 18 % was confirmed to be a Cr23C6 phase. On the surface of the substrates with a porosity of 10 %, the formation of a Cr7C3 phase was found. The thickness of the chromiumcarbide layer increased with an increase of the reaction time. No effect of the impurities on the formation and the thicknessof chromium carbide layer was observed.
(2) The formation rate of SiC on the substrates increased with increasing the reaction time. In the heattreatment in Si powder at 1450°C for 3h, the formation rate of SiC on the surface of the substrates with a porosity of 18 % was higher than that on the surface of the substrates with a porosity of 10 %. And also, the formation of SiC in the substrates was observed; the concentration of SiC along the thickness decreased rapidly up to 0.3mm and then gradually in a range 0.3-1.0mm. No influence of impurities containing in the substrates was found on the formation of SiC on and in the substrates.抄録全体を表示PDF形式でダウンロード (7028K) -
大谷 杉郎, 武田 章義, 長井 遵正, 林 利幸, 金子 友彦, 星井 進介, 小島 昭1995 年 1995 巻 170 号 p. 266-272
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーCarbon fiber reinforced ceramics (CFRCs) were prepared from PAN based carbon fiber (CF) and aluminum-phosphate solution (ACIDOPHOS 120M: ACP) as a matrix precursor.
ACP was easily impregnated for CF, because it was water soluble. Therefore, these CFRCs showed high-volume fiber contents. As a result, it gave higher mechanical properties of CFRCs.
The unidirectional sheets of high performance carbon fibers impregnated with ACP were dried at 80°C to make the prepreg sheets. These prepreg sheets then were laminated into CFRC plate by a hot-press molding (processing pressure>10MPa, maximum processing temperature from 200 to 280°C) and were subsequently heated in Argon up to 500°C.
Addition of small amounts of metal oxides, for example: Al2O3 (10 wt %) or MgO (2 wt %) or ZnO (4 wt %) into the ACP remarkably improved the operation efficiency.
The result of X-ray analyses indicate that the 500°C heat-treated matrices were mainly composed of aluminum phosphate (AlPO4) and certain amount of amorphous contents. But the amorphous contents was slightly observed in the matrix which was added with Al2O3.
The obtained CFRCs exhibited the following characters: fiber volume of 40-50 wt %, maximum bending strength of 553 MPa, and maximum bending modulus of 80 GPa.抄録全体を表示PDF形式でダウンロード (2149K) -
星井 進介, 小島 昭, 大谷 杉郎1995 年 1995 巻 170 号 p. 273-279
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーA composite material was prepared with carbon fiber (CF) and a matrix of phosphate (as named ACP) mainly consisting of aluminum phosphate. CF was used in the form of felt cloth. Prepreg was made with CF and ACP, which was laminated and formed under pressure in a hot press into a composite. The prepreg was pretreated by drying at 80°C to form a compact matrix and to increase the adhesion between laminated prepregs. At the hot press treatment thorough removal of water was tried by using absorbent sheet and release sheet to form a compact structure. Consequently, porosity of CF/ACP composite decreased, and its bulk density and bending strength increased. SEM observation showed the formation of vitreous and compact matrix. Besides, adhesion between prepregs and shear fracture resistance were improved.抄録全体を表示PDF形式でダウンロード (4731K) -
奥 達雄, 平岡 利治, 曾我部 敏明, 黒田 浩二1995 年 1995 巻 170 号 p. 280-285
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーPlasma facing materials for fusion devices are required to have the high thermal conductivity, high strength and high fracture toughness. Finegrained graphites and C/C composites were used as the base materials for applications to plasma facing components of fusion devices.The effects of high temperature heat treatment, pressurized graphitization and metal (copper or silver) impregnation on the thermal conductivity of these carbon materials have been investigated. As a result, the thermal conductivity of carbon materials increased due to high temperature heat treatment. Pressurized graphitization increased room temperature thermal conductivity. Copper or silver impregnation into the carbon materials seemed to have a tendency for increasing therml conductivity at different temperatures. However, there were some cases in which the thermal conductivity decreased due to metal impregnation at different temperatures. The reason for this was considered that carbon atoms did not adhesive with copper or silver, especially at room temperature.抄録全体を表示PDF形式でダウンロード (619K) -
Eiichi Yasuda, Hisashi Kajiura, Yasuhiro Tanabe1995 年 1995 巻 170 号 p. 286-289
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーThe effect of iodine treatment on carbonization of coal tar pitch was investigated. Coal tar pitch with softening point of 101°C was used as a starting material. The pitch specimen, molded into 6 mm in diameter and 20mm in length, and iodine powder of about twice of the specimen weight were put into a test tube. After sealing the tube, they were heated at 90°C for iodine treatment. The specimens were preoxidized at 170°C for 3 hours in air flow to stabilize the pitch. Then preoxidized specimens were heated for carbonization at a rate of 2.5°C/min up to 800°C in Ar flow. The duration at the highest temperature was 1 hour. From the result of solvent fractionation using benzene and pyridine, iodine treatment and preoxidation treatment was known to increase molecular weight of components in the pitch. Carbon yield of the specimen was increased from 56% to 76% by iodine treatment for 20 hours. Microstructure of the carbonized specimens changed from flow type texture to mosaic one with increasing period of the iodine treatment.抄録全体を表示PDF形式でダウンロード (2114K) -
山本 修, 笹本 忠, 稲垣 道夫1995 年 1995 巻 170 号 p. 290-294
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーBy the use of mesophase-pitch and PAN-based carbon fibers with different microstructures heat-treated at different temperatures, solid state reaction between carbon fibers and silicon or chromium metallic powder was examined by the heat-treatment at 1450°C for 3h. The formation of Cr7C3 by the reaction between carbon fibers and chromium metallic powder was found on the mesophasepitchbased fibers, but no reaction to PANbased fibers occurred. In the carbon fibers heat-treated in silicon metallic powder, no formation of SiC was found on the all of carbon fibers used in this study.抄録全体を表示PDF形式でダウンロード (7024K) -
ホスト炭素材料の熱処理温度の効果阿久 沢昇, 高橋 洋一1995 年 1995 巻 170 号 p. 295-297
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーEthylene-sorption isotherms of CsC24 prepared from carbon materials with different heattreatment temperatures (HTT) of 1000, 1500, 2000 and 2600°c were determined at 194K. It was found that the saturated amount of ethylene sorbed by CsC24 decreased with decreasing HTT of the starting material.
This behavior was discussed in connection with the degree of charge transfer between Cs and carbon layers. 13C-NMR of the CsC24 samples showed that the degree of charge transfer decreases when HTT of the starting material decreases. Since the size of cesium decreases with reducing the extent of ionization (rcs+=1.67Å, rcs0=2.67Å), it can be said that the free volume of the interlayer spaces decreases with decreasing HTT, so that the amount of sorbed ethylene decreases with decreasing HTT.抄録全体を表示PDF形式でダウンロード (284K) -
稲垣 道夫1995 年 1995 巻 170 号 p. 298-306
発行日: 1995/12/25
公開日: 2011/03/01
ジャーナル フリーRecent new development in graphite intercalation compounds (GICs) with alkali metals was reviewed. GICs with high alkali metal content were synthesized under high pressures, being exampled by LiC2 and KC4, and also in the presence of small amount of oxygen, exampled by KC3.7O0.07 and NaC6O0.5. Binary alkali metal-GICs were synthesized in 2-methyltetrahydrofuran (MeTHF) by spontaneous chemical reaction, even though ternary GICs, such as K-THF-GIC, were usually obtained in most organic solvents. Binary GICs were also obtained in propylenecarbonate (PC) by electrochemical reaction. These experimental results strongly suggest that the third component such as oxygen, MeTHF, etc. has certain effect on the intercalation reactions of alkali metals into graphite gallery. Possible mechanisms were discussed.抄録全体を表示PDF形式でダウンロード (1234K) -
その調製と利用大谷 朝男1995 年 1995 巻 170 号 p. 307-316
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーActivated carbon fiber (ACF) is used in new application fields as solvent recovery, water purification, capacitor etc. on the basis of its some unique properties which are different from those of the conventional granular or powder active carbon (AC). Further extension of application fields, the present author think, will be accomplished by supporting of an agent on ACF, because this is the most effective technique to create novel properties and functions. In this review, ACF was first characterized briefly by comparing with the conventional AC. Next mesopore formation techniques are explained because they must be a key to extend application fields of not only usual ACF but also agentsupported ACF. Some supporting techniques of an agent on ACF are discussed in regard to their advantages and disadvantages. Finally the practical application studies of agentsupported ACF in progress are introduced.抄録全体を表示PDF形式でダウンロード (1543K) -
安田 榮一1995 年 1995 巻 170 号 p. 317-320
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーIt is well known that the variety of carbon materials is mainly caused by the bond nature of carbon atoms ; i.e., sp, sp2 and sp3. Recently, many studies on carbon materials deal with phenomena between carbon atoms and the other ; e.g., surface modification of carbon fibers, carbon electrodes for lithium ion secondary battery, carbon molecular sieves, new metal carbides, carbon allotropes, etc. These studies are based on alloyed materials among carbon atoms with different bond nature and/or between carbon atoms and the others. To develop a new carbon field in the aspect of alloys, a research committee is established in 1992 in the Carbon Society of Japan. The committee has tentatively defined the term carbon alloys as follows; “carbon alloys are carbon materials mainly consisting of multicomponent carbon atom aggregates. In the materials chemical and/or physical interactions act between each structural unit. Here, carbons with different bond nature are denoted as different components.” In this year we discussed carbon alloys in a view point of the size and space to be controlled. Among the discussion it was cleared that carbon materials are generally one of the alloys with benzenoide and nonbenzenoiode components, even if bond nature of composed carbonatoms are sp2 only.抄録全体を表示PDF形式でダウンロード (597K) -
大谷 杉郎1995 年 1995 巻 170 号 p. 321
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (1377K) -
同じ族に属しながらシリコンはsp3共有結合がほとんどであるのに, 炭素sp, sp2, sp3という複数の混成軌道をとることができるのでしょうか?田中 一義1995 年 1995 巻 170 号 p. 324
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (155K) -
活性炭素繊維とは?どのようにして活性炭になるのでしょうか?また, 一般の活性炭とどこが違うのでしょうか?島崎 賢司1995 年 1995 巻 170 号 p. 325
発行日: 1995/12/25
公開日: 2010/06/28
ジャーナル フリーPDF形式でダウンロード (171K)
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