Carbon foam derived from various precursors

Carbon foam derived from various precursors

A series of carbon foams was developed by using low-cost precursors, such as coal, coal tar pitch and petroleum pitch. The properties of the resultant carbon foams cover a wide range, e.g., bulk density, 0.32–0.67 g/cm 3, compressive strength, 2.5–18.7 MPa, isotropic and anisotropic microstructure,...

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Bibliographic Details
Published in:Carbon (New York) Vol. 44; no. 8; pp. 1535 - 1543
Main Authors: Chen, Chong, Kennel, Elliot B., Stiller, Alfred H., Stansberry, Peter G., Zondlo, John W.
Format: Journal Article
Language:English
Published: Oxford Elsevier Ltd 01-07-2006
Elsevier Science
Subjects:
Carbonization
coal, pitch
Cross-disciplinary physics: materials science; rheology
Exact sciences and technology
Fullerenes and related materials; diamonds, graphite
heat treatment
Materials science
Mechanical properties
Optical microscopy
Physics
porosity
Porous carbon
SEM
Specific materials
Carbonization
Mechanical properties
Optical microscopy
Porous carbon
Coal tar pitch
Petroleum pitch
Carbon
Precursor
Coal
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Summary:A series of carbon foams was developed by using low-cost precursors, such as coal, coal tar pitch and petroleum pitch. The properties of the resultant carbon foams cover a wide range, e.g., bulk density, 0.32–0.67 g/cm 3, compressive strength, 2.5–18.7 MPa, isotropic and anisotropic microstructure, etc. The investigation of foaming mechanism and the relationship between properties and structure indicate that the fluidity and dilatation of the foaming precursors significantly affect the foaming performance and foam structure. Raw coal samples were foamed directly without pretreatment in this work. However, for the pitch based foaming precursor, a thermal pretreatment is necessary to adjust its thermoplastic properties to meet the foaming requirement. The mechanical strength of carbon foam is found to be related to not only the foam cell structure, but also the fluidity and anisotropic domain size of the foaming precursors. In addition, the micro and mesopore structure in carbon foam matrix was investigated by gas adsorption and it was found that it also affects the strength of carbon foam and is related to the fluidity of foaming precursor.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2005.12.021