Abstract:
A curable liquid carbon precursor formulation for preparing a porous carbon composition including (a) at least one aromatic epoxy resin; (b)(i) at least one aromatic co-reactive curing agent, or (b)(ii) at least one catalytic curing agent, or (b)(iii) a mixture thereof; and (c) at least one porogen; wherein the liquid composition has a neat viscosity of less than 10,000 mPa-s, at 25 °C prior to adding porogen, prior to adding optional components, prior to curing, and prior to carbonizing; and wherein the liquid composition being cured has a carbon yield of at least 35 weight percent disregarding the weight of the porogen and any optional components present in the composition; a process for preparing the porous carbon composition from the above formulation including the steps of curing the formulation, and carbonizing the cured product resulting from curing the formulation such that a porous carbon composition is produced; and a porous carbon composition made by the above process.
Abstract:
A method for producing a porous carbon material and a porous carbon material produced thereafter are described. The method comprises the formation of an unsatured polymer having a porous structure by polymerization of at least on carbonaceous monomer in a monomer phase of a monomer-water emulsion, the transformation of the unsaturated polymer by chemical and/or physical treatment and the carbonization of the transformed polymer by thermal treatment.
Abstract:
A known method for producing a porous carbon product comprises producing a monolithic template from inorganic matrix material having pores connected to each other, infiltrating the pores of the template with carbon or a carbon precursor substance forming a green body framework containing carbon surrounded by matrix material and calcining the green body framework forming the porous carbon product. In order to provide a method proceeding herefrom which permits cost-effective production of a product from porous carbon, according to the invention the production of the template comprises a soot separation process in which a hydrolyzable or oxidable starting compound of the matrix material is supplied to a reaction zone, therein converted to matrix material particles by hydrolysis or pyrolysis, the matrix material particles are agglomerated or aggregated and formed to the template.
Abstract:
The subject invention discloses a method for the preparation of a dual structure cellular ceramic object where a dispersion of a ceramic precursor a chain-growth or step- growth polymer precursor and a solvent is heated to a first temperature at a first rate followed by heating to a second temperature at a second rate and holding the temperature to form a sintered dual structure cellular ceramic object which is then cooled at a third rate to room temperature. The dual structure cellular ceramic object has a dense surface layer over at least a portion of the object that abruptly yet smoothly and continuously transitioning into a porous ceramic.
Abstract:
Organic gels of resorcinol-formaldehyde type, carbon-based materials of adjusted porosity derived therefrom by pyrolysis. Such materials may be used, in particular, for the production of electrodes.
Abstract:
La presente invención se refiere a un procedimiento de fabricación de cerámicas porosas y materiales multifásicos avanzados a partir de precursores vegetales, concretamente a partir de la infiltración de aleaciones metálicas en preformas de carbón obtenidas por pirólisis de precursores celulósicos. La invención incluye también un procedimiento de unión de estos materiales. La invención es aplicable fundamentalmente al ámbito de la obtención de materias primas utilizable en un amplio espectro de la industria, para la obtención de componentes para aplicaciones que se basen en sus propiedades de dureza, resistencia a la fricción, conductividad térmica, conductividad eléctrica, resistencia mecánica, alta superficie específica, porosidad, resistencia a la corrosión, resistencia al choque térmico, y baja densidad.
Abstract:
An insulative cap (16) for an induction furnace comprising a carbon foam having a pore distribution such that at least about 90% of the pore volume of the pores have a diameter of between about 10 and about 150 microns and at least about 1% of the pores have a diameter of between about 0.8 and about 3.5 microns.
Abstract:
An activated carbon foam material with improved graphitizability is formed by including an oxidation promoting metal-containing additive into the carbon foam and subsequently heat treating the foam in a reactive atmosphere. The oxidation promoting metal-containing additive greatly improves the development of the carbon foam's ramified pore system resulting in a carbon foam with a much greater surface area. This inventive foam may be created by introducing the oxidation promoting metal by way of an oxidation catalyst during the polymerization of the phenolic resin or as a inorganic chemical activating agent to the formed phenolic resin. The foam is then heated in a reactive atmosphere to produce an activated foam with a surface area of from about 200 m2/g to about 3000 m2/g.
Abstract:
A glassy carbon coated carbon foam material is formed by coating carbon foam with a glassy carbon layer. Carbon foam may be produced by carbonizing a phenolic or polyurethane foam at high temperatures in an inert atmosphere. The carbon foam is then machined to a desired shape and treated with a fine carbon or graphite powder to the surface. Subsequently a resin is applied to the surface of the carbon foam, and the coated carbon foam block is fired to carbonize the resin coating into a glassy carbon coating. The firing and coating are repeated until the desired coating thickness and surface properties are achieved.