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Effect of Gravity on Titanium Carbide Foams by Self-propagation High-temperature Synthesis

Published online by Cambridge University Press:  31 January 2011

Yasuhiro Tanabe ,
Takashi Sakamoto ,
Nobuko Okada ,
Takashi Akatsu ,
Eiichi Yasuda ,
Seiichi Takasu  and
Takayuki Sabato
Yasuhiro Tanabe*
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 226–8503, Japan
Takashi Sakamoto
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 226–8503, Japan
Nobuko Okada
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 226–8503, Japan
Takashi Akatsu
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 226–8503, Japan
Eiichi Yasuda
Affiliation:
Center for Materials Design, Materials and Structures Laboratory, Tokyo Institute of Technology, 4259, Nagatsuta, Midori, Yokohama 226–8503, Japan
Seiichi Takasu
Affiliation:
Developing Section, Production Department, Nichiden Machinery, Ltd., 85, Minami Yamada-cho, Kusatsu, Shiga 525–8511, Japan
Takayuki Sabato
Affiliation:
Developing Section, Production Department, Nichiden Machinery, Ltd., 85, Minami Yamada-cho, Kusatsu, Shiga 525–8511, Japan
*
a)Address all correspondence to this author.
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Abstract

Titanium carbide foams are synthesized by a self-propagation high-temperature synthesis technique using carbon black, which generates gases during the synthesis. The synthesis is performed under terrestrial and microgravity conditions. The effects of gravity on the synthesis are evaluated in this study. The foaming is mainly caused by H2O and CO gases from the carbon black. The elongation of the products increases with decreasing environmental pressure and increasing amount of generated gases. Since the gas flows out along the direction of the combustion wave propagation, the products expand only along this direction. The propagation velocity of the combustion wave increases with increasing amount of generated gases and environmental pressure, which is due to the amount of molten Ti transporting into the reaction/preheat zone. Under higher environmental pressures, thermal convection of the environmental gases mainly affects the propagation velocity. However, at lower pressures, the behavior of the molten Ti has a great effect compared with the gases surrounding the specimens.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 4 , April 1999 , pp. 1516 - 1523
Copyright
Copyright © Materials Research Society 1999

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