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C Composite by zone treatment on carbon fiber
Carbon Vol. 34, No. 5, Pp. 689691. 1996 Copyright Q 1996 Elsevier Science Ltd Printed in Great Britain. All rights reserved CKJOS-6223/96$15.00 + 0.00
TANS0
1995 (NO. 170) - ABSTRACTS
Note:- The Editor-in-Chief has been informed that the correct way to reference Tanso papers is as shown below, and not as done in previous issues this year. The year designates the volume number. In the near future our Japanese colleagues will distinguish between original papers, notes and reviews. At present no such distinction is made
Microstructural Change of Pitch Derived Carbon Matrix in C/C Composite by Zone Treatment on Carbon Fiber by Eiichi Yasuda*, Yoshio Suzuki, Yuuji Inoue, Jajime Izawa, Osamu Ebato, Shigeru Takano, Kenji Kihara, Akira Kondou, Masayuki Ookawa, Toshihura Hiraoka, Masakiyo Shimada, Masami Kume, Kusuo Niiya, Yasuhiro Aiba and Kazuo Takeuchi*
Formation of Carbide Layer on Carbon Materials by Silicon and Chromium Impregnation (Part 1: Effect of Impurity and Porosity on the Formation) by Osamu Yamamoto, Hiroko Hiura, Tadashi Sasmoto and Michio Inagaki*
Dlvlsion of Carbon Composites, New Carbon Forum, M&C 402, 2-3-13 Ogawacho, Kanda, Chiyoda-ku, Tokyo 101, Japan; *RLEM, Tokyo Institute of Technology; 4259 Nagatsuta, Midoriku, Yokohama 226, Japan.
The metal carbide layer on the surface of the carbon substrates was prepared by silicon and chromium The effect of the porosities and impregnation. 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 Cr&e phase. On the surface of the substrates with a porosity of lo%, the formation of a Cr7C3 phase was found. The thickness of the chromium carbide layer increased with an increase in reaction time. No effect of impurities on the formation and the thickness of chromium carbide layer was observed. (2) The formation rate of Sic on the substrates increased with increasing 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 0.3l.Omm. No influence of impurities contained in the substrates was found on the formation of Sic on and in the substrates. [Tanso 1995 (No. 170) 2591
The effects of ozone treatment of carbon fibers on their properties and on the microstructural change of a pitchdervied carbon matrix composite were investigated. Surface treatment of PAN-based and pitch-based carbon fibers were carried out using 4% ozone at 110°C for 8 hours. Surface oxidation proceeded continuously, and it was recognized that fine pits and functional groups were introduced on the fiber, however, there was no obvious degradation of tensile strength. Surface treatment increased the bonding strength between the fiber and the pitch-derived carbon matrix, and debonding or peeling-off was not observed. A high density &d a low content of closed pores were attain& Esneciallv. in case of Ditch derived carbon fiber it was difficult & distinguish’ the carbon fiber and the matrix carbon. [Tanso 1995 (No. 170) 2471
Synthesis of Fluorine-Graphite Intercalation Compounds in Anhydrous Liquid Hydrogen Fluoride Containing a Lewis Acid by Tsuyoshi Nakajima and Michiyuki Namba Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
Highly fluorinated graphite has been prepared in anhydrous liquid hydrogen fluoride containing a Lewis acid. The products were stage 1, C2.4F -C&F with u-axis lattice parameters, a,, = 0.2470 - 0.2473nm. It was found that MoF6 is more effective than SbFS as an oxidizer of graphite and the relatively low temperatures such as 8 to 18°C are preferable to yield the C,F samples with large a, values. The C,, and F1, binding energies of &F to C&F were higher than those of stage 1 + 2 C2.7F - CA.~F, and almost constant with a, values between 0.2470 and 0.2473nm. [Tanso 1995 (No. 170) 2551
Department of Chemical Technology, Kanagawa Institute of Technology, 1030 Shimo-ogino, Atsugi, 243-02 Japan *Faculty of Engineering, Hokkaido University, Kita-ku, Sapporo, 060 Japan
Preparation of Carbon Fiber/Ceramic Composites Using Aluminum Phosphate as a Matrix Precursor by Sugio Tani*, Akiyoshi Takeda*, Jyunsei Nagai*, Toshiyuki Hayashi*, Tomohiko Kaneko*, Shinsuke Hoshii**, and Akira Kojima** *School of High-Technology for Human Welfare, Tokai University, Numazu-shi 410-03, Japan; **Gunma College of Technology, Toriba-cho, Maebashi-shi 580, Japan Carbon prepared
fiber
reinforced
ceramics
(CFRCs)
were
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
TANS0
1995 (NO. 170) - ABSTRACTS
Note:- The Editor-in-Chief has been informed that the correct way to reference Tanso papers is as shown below, and not as done in previous issues this year. The year designates the volume number. In the near future our Japanese colleagues will distinguish between original papers, notes and reviews. At present no such distinction is made
Microstructural Change of Pitch Derived Carbon Matrix in C/C Composite by Zone Treatment on Carbon Fiber by Eiichi Yasuda*, Yoshio Suzuki, Yuuji Inoue, Jajime Izawa, Osamu Ebato, Shigeru Takano, Kenji Kihara, Akira Kondou, Masayuki Ookawa, Toshihura Hiraoka, Masakiyo Shimada, Masami Kume, Kusuo Niiya, Yasuhiro Aiba and Kazuo Takeuchi*
Formation of Carbide Layer on Carbon Materials by Silicon and Chromium Impregnation (Part 1: Effect of Impurity and Porosity on the Formation) by Osamu Yamamoto, Hiroko Hiura, Tadashi Sasmoto and Michio Inagaki*
Dlvlsion of Carbon Composites, New Carbon Forum, M&C 402, 2-3-13 Ogawacho, Kanda, Chiyoda-ku, Tokyo 101, Japan; *RLEM, Tokyo Institute of Technology; 4259 Nagatsuta, Midoriku, Yokohama 226, Japan.
The metal carbide layer on the surface of the carbon substrates was prepared by silicon and chromium The effect of the porosities and impregnation. 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 Cr&e phase. On the surface of the substrates with a porosity of lo%, the formation of a Cr7C3 phase was found. The thickness of the chromium carbide layer increased with an increase in reaction time. No effect of impurities on the formation and the thickness of chromium carbide layer was observed. (2) The formation rate of Sic on the substrates increased with increasing 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 0.3l.Omm. No influence of impurities contained in the substrates was found on the formation of Sic on and in the substrates. [Tanso 1995 (No. 170) 2591
The effects of ozone treatment of carbon fibers on their properties and on the microstructural change of a pitchdervied carbon matrix composite were investigated. Surface treatment of PAN-based and pitch-based carbon fibers were carried out using 4% ozone at 110°C for 8 hours. Surface oxidation proceeded continuously, and it was recognized that fine pits and functional groups were introduced on the fiber, however, there was no obvious degradation of tensile strength. Surface treatment increased the bonding strength between the fiber and the pitch-derived carbon matrix, and debonding or peeling-off was not observed. A high density &d a low content of closed pores were attain& Esneciallv. in case of Ditch derived carbon fiber it was difficult & distinguish’ the carbon fiber and the matrix carbon. [Tanso 1995 (No. 170) 2471
Synthesis of Fluorine-Graphite Intercalation Compounds in Anhydrous Liquid Hydrogen Fluoride Containing a Lewis Acid by Tsuyoshi Nakajima and Michiyuki Namba Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Sakyo-ku, Kyoto 606-01, Japan
Highly fluorinated graphite has been prepared in anhydrous liquid hydrogen fluoride containing a Lewis acid. The products were stage 1, C2.4F -C&F with u-axis lattice parameters, a,, = 0.2470 - 0.2473nm. It was found that MoF6 is more effective than SbFS as an oxidizer of graphite and the relatively low temperatures such as 8 to 18°C are preferable to yield the C,F samples with large a, values. The C,, and F1, binding energies of &F to C&F were higher than those of stage 1 + 2 C2.7F - CA.~F, and almost constant with a, values between 0.2470 and 0.2473nm. [Tanso 1995 (No. 170) 2551
Department of Chemical Technology, Kanagawa Institute of Technology, 1030 Shimo-ogino, Atsugi, 243-02 Japan *Faculty of Engineering, Hokkaido University, Kita-ku, Sapporo, 060 Japan
Preparation of Carbon Fiber/Ceramic Composites Using Aluminum Phosphate as a Matrix Precursor by Sugio Tani*, Akiyoshi Takeda*, Jyunsei Nagai*, Toshiyuki Hayashi*, Tomohiko Kaneko*, Shinsuke Hoshii**, and Akira Kojima** *School of High-Technology for Human Welfare, Tokai University, Numazu-shi 410-03, Japan; **Gunma College of Technology, Toriba-cho, Maebashi-shi 580, Japan Carbon prepared
fiber
reinforced
ceramics
(CFRCs)
were
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