C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
277/71
C04B 35/536 (2006.01) C09K 3/10 (2006.01) F16C 33/16 (2006.01)
Patent
CA 2230182
-32- The invention relates to a sealing material made of expanded graphite and a method of producing it. In the sealing material made of expanded graphite of the invention, a surface layer portion of an expanded graphite base material 11 in which expanded graphite particles 1 are pressurized is subjected to a blast process or the like, whereby the weight of the expanded graphite base material 11 is reduced by a range of 0.5 to 3%, so that the diffraction peak of an X-ray diffraction of the exposed surface layer portion of the expanded graphite base material 11 is in a range of 26.52 to 26.48. In such an sealing material made of expanded graphite, the elongation rate and the tensile strength are improved, and also the flexibility is remarkably improved. Therefore, also extension of the application range of a product and improvement of the productivity of a product can be attained. The sealing material may be preferably used in various kinds of sealing members for high-temperature use such as a packing, a gasket, a V-shaped ring, and a valve seat, and a sliding material such as a bearing, or a heat insulating, material for a high temperature vacuum furnace.
L'invention concerne une pâte obturatrice à base de graphite expansé, ainsi que le procédé permettant de fabriquer ladite pâte obturatrice. Celle-ci est structurée de façon que la couche superficielle d'un matériau de base en graphite (11), formé par la mise sous pression des grains de graphite expansés (1), est soufflée. Ce procédé diminue le poids du matériau de base en graphite (11) de 0,5 à 3 % et donne un pic de diffraction de la couche superficielle exposée du matériau en graphite (11), par diffraction des rayons X, compris entre 26,52 et 26,48. Ce type de pâte de graphite a un coefficient d'allongement, une résistance à la traction et une flexibilité améliorés. Il peut donc élargir la gamme d'applications des produits traités et améliorer la productivité de leur fabrication, et il peut être utilisé favorablement pour fabriquer un matériau obturateur à haute température tel que des emballages, des joints d'étanchéité, des joints type-V, en graphite plaques pour soupapes, du matériel coulissant tel que des paliers, du matériau isolant pour les fours à vide à haute température, etc.
Horii Daisaburo
Sugita Katsunori
Ueda Takahisa
Fetherstonhaugh & Co.
Nippon Pillar Packing Co. Ltd.
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