Pitch-based carbon foam and composites and uses thereof

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 35/52 (2006.01) B64C 1/40 (2006.01) B64G 1/58 (2006.01) C04B 38/00 (2006.01) C04B 40/00 (2006.01) F16L 59/00 (2006.01) F28D 15/04 (2006.01) F28D 20/02 (2006.01) F28F 21/02 (2006.01)

Patent

CA 2399719

A thermally conductive carbon foam is provided, normally having a thermal conductivity of at least 40 W/m.K. The carbon foam usually has a specific thermal conductivity, defined as the thermal conductivity divided by the density, of at least about 75 W.cm3/m.°K.gm. The foam also has a high specific surface area, typically at least about 6,000 m2/m3. The foam is characterized by an x-ray diffraction pattern having "doublet" 100 and 101 peaks characterized by a relative peak split factor no greater than about 0.470. The foam is graphitic and exhibits substantially isotropic thermal conductivity. The foam comprises substantially ellipsoidal pores and the mean pore diameter of such pores is preferably no greater than about 340 microns. Other materials, such as phase change materials, can be impregnated in the pores in order to impart beneficial thermal properties to the foam. Heat exchange devices and evaporatively cooled heat sinks utilizing the foams are also disclosed.

L'invention concerne une mousse de carbone thermiquement conductrice, dont la conductivité thermique est normalement d'au moins 40 W/m.K. La mousse de carbone présente d'ordinaire une conductivité thermique spécifique, définie comme étant la conductivité thermique divisée par la densité, d'au moins 75 W.cm<3>/m. DEG K.gm. La mousse présente également une grande superficie spécifique, généralement d'au moins 6 000 m<2>/m<3>. La mousse se caractérise par un motif de diffraction de rayons X ayant des crêtes de "doublet" de 100 et 101 se caractérisant par un facteur de division de crête relatif n'excédant pas 0,470. La mousse, graphiteuse, présente une conductivité thermique sensiblement isotrope. Elle comporte des pores sensiblement ellipsoïdaux dont le diamètre moyen ne dépasse pas, de préférence, 340 microns. D'autres matériaux, par exemple ceux à changement de phase, peuvent être imprégnés dans les pores afin de conférer à la mousse des propriétés thermiques intéressantes. L'invention traite également de dispositifs d'échange thermique et de disperseurs de chaleur refroidis par évaporation utilisant ces mousses.

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