C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/42 (2006.01) C08K 7/00 (2006.01) C08K 7/18 (2006.01) H01B 1/24 (2006.01) H01L 23/36 (2006.01)
Patent
CA 2204331
This invention is directed to a composite composition of particles of highly oriented graphite in the form of flakes having a hexagonal crystal orientation and an aspect ratio of at least 5 to 1 and a polymeric binder which when polymerized under compression forms a solid having a high thermal conductivity and low density and to a method of forming a machinable composite of high thermal conductivity comprising the steps of combining particles of highly oriented graphite flakes having an hexagonal crystal orientation and an aspect ratio of at least 5 to 1 with a polymeric binder to form a composition having at least a 40% graphite particle volume fraction, compressing the composition under a pressure sufficient to substantially align the particles parallel to one another and to the surface of the composition normal to the direction of the applied pressure until said binder polymerizes into a solid thereby forming an electrically conductive solid having a high thermal conductivity.
Cette invention se rapporte à une matière composite en particules de graphite hautement orienté, sous forme de flocons à structure cristalline hexagonale avec un rapport dimensionnel de 5 : 1 et un liant polymérique qui, lorsque polymérisé en compression, forme un solide à haute conductivité thermique et faible densité. Méthode pour former un composite usinable à haute conductivité thermique, comprenant les étapes suivantes : combinaison des particules de flocons de graphite hautement orienté à structure cristalline hexagonale avec un rapport dimensionnel de 5 : 1 avec un liant polymérique pour obtenir une composition comportant au moins 40 % de particules de graphite; compression de la composition à une pression suffisante pour provoquer l'alignement des particules parallèles les unes aux autres et avec la surface de la composition dans le sens de la pression exercée, jusqu'à ce que le liant en question se polymérise en solide, pour ainsi obtenir un solide conducteur d'électricité à haute conductivité thermique.
Mariner John Thomas
Sayir Haluk
Advanced Ceramics Corporation
Moffat & Co.
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