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Graphite blocks with high thermal conductivity derived from natural graphite flake

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Abstract.
In this work, natural graphite flake (NG) and mesophase pitchwere used as precursor carbons
to prepare the graphite blocks, which were dopedwith Si and Ti powders. After hot-pressed at
2700 C,weinvestigated the effect of mean size ofNGon properties and microstructure of the
graphite blocks. Results showed that both thermal conductivity and flexural strength of the
graphite blocks were improved as mean size of NG in raw material increased from 50 to
246 lm. However, a decrease of thermal conductivity was observed when mean size of NG
was higher than 246 lm. The density and open porosity were respectively 2.26 g/cm3 and
5.82% when mean size of NG in raw material was 246 lm. The thermal conductivity was
enhanced, however, the flexural strength was reduced as hot-pressing temperature
increased from 2300 to 3000 oC. The thermal conductivity and flexural strength of the graphite
block were respectively 704 W/m K and 21.1 MPa when hot-pressing temperature was
3000 oC. Phase analysis demonstrated there were diffraction peaks of graphite, TiC and a-
SiC crystals in the graphite block as the hot-pressing temperature was less than 2500 oC.
No SiC crystals were evident when the hot-pressing temperature was 2700 oC or above.

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Ketersediaan

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Informasi Detail

Judul Seri

CA R B O N

No. Panggil

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Penerbit

London : Elsevier Ltd.., 2008

Deskripsi Fisik

CA R B O N 4 6 ( 2 0 0 8 ) 4 1 4 –4 2 1

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

Versi lain/terkait

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