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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Densification of in situ prepared mesocarbon microbead/carbon nanotube composites by hot-press sintering
WU Bin(吴 彬)1, 2, GONG Qian-ming(巩前明)1, 2, WU Jian-jun(吴建军)1, 2,
SONG Huai-he(宋怀河)3, LIANG Ji(梁 吉) 1, 2

1. Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China;
2. Key Laboratory for Advanced Materials Processing Technology of Ministry of Education,
Tsinghua University, Beijing 100084, China;
3. State Key Laboratory of Chemical Resource Engineering,
Beijing University of Chemical Technology, Beijing 100029, China

Abstract:In situ prepared mesocarbon microbead/carbon nanotube(MCMB/CNT) composites are potential precursors of high density carbon materials for various applications. Integrated MCMB/CNT composites were successfully fabricated by hot-press sintering at 550 ℃ under 30 MPa. After further calcination at 900 ℃, the hot-press sintering fabricated MCMB block has an apparent density of 1.77 g/cm3 and the open porosity 5.1%. With the addition of 5%(mass fraction) CNTs, the density of the composite block is elevated to 1.84 g/cm3, and its open porosity is reduced to 3.5%. The flexural strength of composite block with 5% CNTs is elevated to 116 MPa. Through the hot-press sintering, pores of 10−50 nm in the calcinated bulks are remarkably eliminated. The interstice between microbeads in the composite blocks is filled up by CNTs together with β-resin and quinoline-insoluble spheres, which can further contribute to the densification.

 

Key words: carbon nanotube; mesocarbon microbead; carbonaceous mesophase; flexural strength; density; open porosity

ISSN 1672-7029
CN 43-1423/U

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