Abstract:
Matériau multicouche à base de graphite expansé renforcé par un métal comprenant au moins une couche interne (10) en graphite expansé recomprimé et deux couches externes métalliques (20), le graphite expansé recomprimé ayant une densité supérieure à 1,6 g/cm 3 . Chaque couche externe métallique (20) a une épaisseur inférieure au dixième de l'épaisseur totale de la structure multicouche. Les couches externes métalliques (20) sont avantageusement munies de picots (21 ) régulièrement répartis et orientés vers la couche interne (10) en graphite expansé recomprimé, la densité desdits picots (21 ) étant supérieure à 25 par dm 2 et leur hauteur étant supérieure à 15% de l'épaisseur finale de la couche interne (10) en graphite expansé recomprimé. Lesdits picots peuvent résulter d'une perforation de la couche externe métallique (20), la paroi autour de l'orifice perforé étant déformée et présentant la forme d'une excroissance sensiblement axisymétrique.
Abstract:
The invention concerns a method for combined grinding of a homogeneous mixture of particles comprising a conductive core consisting of at least one graphite and continuously or discontinuously coated with at least a material other than the one constituting the core, the core particles being of greater size than those of the particles used for producing the coating of the cores by combined grinding. The resulting particulate mixtures exhibit electrochemical and mechanical properties making them suitable to be advantageously used in electrochemical batteries and in paints.
Abstract:
L'invention concerne un procédé de fabrication d'un objet composite comprenant au moins deux parties distinctes ayant des propriétés et/ou fonctions différentes, caractérisé en ce qu'on forme au moins une épaisseur (53) comprenant plus de 70 % en poids d'un matériau expansé choisi parmi les graphites expansés, on forme au moins une autre épaisseur (52) comprenant plus de 70 % en poids d'un autre matériau expansé choisi parmi les vermiculites expansées, puis on comprime ensemble les épaisseurs formées de façon à les consolider, chaque épaisseur consolidée correspondant à l'une des parties de l'objet. Le procédé permet notamment de réaliser des objets composites tels qu'une cellule électrochimique, un moule de fonderie ou encore un convertisseur héliothermique.
Abstract:
A shaped expanded graphite article of the present invention has, at least in its outer layer portion, an oxidation-resistant coating layer which contains a boron element and a phosphorus element. A content of the boron element in the oxidation-resistant coating layer is 1 mass % or more. A content of the phosphorus element in the oxidation-resistant coating layer is 0.1 mass % or more. The oxidation-resistant coating layer has a thickness of 0.5 µm or more.
Abstract:
Thermal insulation structure comprising at least one flexible layer based on compressed expanded graphite particles characterised in that the density of the said flexible layer is equal to at least 0.4 g/cm3 (400 kg/m 3 ) and in that the said thermal insulation structure also comprises another layer close to the said flexible layer based on compressed graphite particles with a lower density, typically less than 0.4 g/cm 3 (400 kg/m 3 ). Preferably, the dense compressed expanded graphite layer has a density of between 0.5 and 1.6 g/cm 3 (500 and 1600 kg/m 3 ) and the said sub-dense compressed expanded graphite layer has a density of between 0.05 and 0.3 g/cm 3 (50 and 300 kg/m 3 ). Thermal insulation elements are also described that are designed to be fitted on furnaces operating under non-oxidising atmosphere and at temperatures of more than 800°C.
Abstract:
Thermal insulation structure comprising at least one flexible layer based on compressed expanded graphite particles characterised in that the density of the said flexible layer is equal to at least 0.4 g/cm3 (400 kg/m ) and in that the said thermal insulation structure also comprises another layer close to the said flexible layer based on compressed graphite particles with a lower density, typically less than 0.4 g/cm (400 kg/m ). Preferably, the dense compressed expanded graphite layer has a density of between 0.5 and 1.6 g/cm (500 and 1600 kg/m ) and the said sub-dense compressed expanded graphite layer has a density of between 0.05 and 0.3 g/cm (50 and 300 kg/m ). Thermal insulation elements are also described that are designed to be fitted on furnaces operating under non-oxidising atmosphere and at temperatures of more than 800°C.
Abstract translation:隔热结构包括至少一个基于压缩膨胀石墨颗粒的柔性层,其特征在于所述柔性层的密度等于至少0.4g / cm 3(400kg / m 3),并且所述隔热层 基于压缩石墨颗粒,其密度通常小于0.4g / cm 3(400kg / m 3),结构还包括靠近所述柔性层的另一层。 优选地,致密压缩膨胀石墨层的密度为0.5-1.6g / cm 3(500和1600kg / m 3),所述亚致密压缩膨胀石墨层的密度为0.05至 0.3g / cm 3(50和300kg / m 3)。 还描述了隔热元件,其被设计成安装在在非氧化气氛下和在高于800℃的温度下操作的炉子上。
Abstract:
A process is presented for forming an anisotropic heat spreader or heat pipe, comprising forming a laminate comprising a plurality of flexible graphite sheets which comprise graphene layers; and directionally aligning the graphene layers of the laminate.
Abstract:
A release lined pressure sensitive adhesive flexible graphite sheet article is provided having low thermal resistance properties comparable to the flexible graphite material itself when compared to prior art PSA sheet products and wherein the release liner is easily removed with the sheet to be used without any significant delamination of the flexible graphite. The flexible graphite sheet comprises a flexible graphite substrate, an adhesive primer coating thereon, a pressure sensitive adhesive coating on the adhesive primer coating and a release liner applied to the pressure sensitive adhesive coating. Double sided pressure sensitive adhesive flexible graphite sheets can also be made using the method of the invention. It has been found that the use of an adhesive primer coating on the flexible graphite substrate applied from an emulsion as a coating and dried instead of the prior art adhesive containing polymer layer applied as a solid film, such as Mylar film, provide the above desired thermal resistance properties and also enable the use of less pressure sensitive adhesive on the sheet thereby maintaining the low thermal resistance properties of the flexible graphite.
Abstract:
Flexible graphite sheet is made by compressing a mixture of fine particle of intercalated, exfoliated, expanded natural graphite with fine particles of intercalated, unexpanded, expandable particles of natural graphite admixed with small amounts of a phosphorous bearing compound, the unexpanded particles being more finely sized than the expanded particles. The resulting sheet of flexible graphite exhibits improved fire retardant and sealability properties and additionally resistance to oxidation and corrosion.
Abstract:
Flexible graphite sheet is made by compressing a mixture of fine particle of intercalated, exfoliated, expanded natural graphite with fine particles of intercalated, unexpanded, expandable particles of natural graphite admixed with small amounts of a phosphorous bearing compound, the unexpanded particles being more finely sized than the expanded particles. The resulting sheet of flexible graphite exhibits improved fire retardant and sealability properties and additionally resistance to oxidation and corrosion.