Low-density microcellular carbon foams

A method has been developed to produce vitreous carbon foams having both low densities (0.03-0.10 g cm exp --3 ) and small cell sizes ( approx 20 mu m). This process involves the replication of a porous sacrificial substrate, i.e. sodium chloride. The salt is pressed initially into bars and sintered...

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Bibliographic Details
Published in:Journal of materials science 1987-05, Vol.22 (5), p.1840-1844
Main Authors: PEKALA, R. W, HOPPER, R. W
Format: Article
Language:English
Subjects:
Aerosols
Chemistry
Colloidal gels. Colloidal sols
Colloidal state and disperse state
Emulsions. Microemulsions. Foams
Exact sciences and technology
General and physical chemistry
Powders
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Summary:A method has been developed to produce vitreous carbon foams having both low densities (0.03-0.10 g cm exp --3 ) and small cell sizes ( approx 20 mu m). This process involves the replication of a porous sacrificial substrate, i.e. sodium chloride. The salt is pressed initially into bars and sintered to give a structure with continuous porosity. The pores are infused with a phenolic solution, the solvent is evaporated, and the resin is pyrolysed within the salt substrate. Extraction of the salt and freeze drying lead to the final carbon foam. The substrate serves two purposes in this process: (1) it prevents shrinkage of the foam during pyrolysis, and (2) it dictates the cell size of the foam. 7 ref.--AA
ISSN:0022-2461
1573-4803
DOI:10.1007/BF01132414