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AssigneeNippon Pillar Packing Co., Ltd.
InventorsTakahisa Ueda, Daisaburo Horii, Katsunori Sugita
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The present invention relates to a sealing material made of expanded graphite and to a method of producing it. In the sealing material made of expanded graphite of the present invention, a surface layer portion of an expanded graphite base material in which expanded graphite particles are pressurized is subjected to a blast process or the like, whereby the weight of the expanded graphite base material 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 is in a range of 26.52.degree. to 26.48.degree.. In such a sealing material made of expanded graphite, the elongation rate and the tensile strength are improved, and also flexibility is remarkably improved. As a result, the product application range is extended and product productivity are improved. 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.
A sealing material of expanded graphite, wherein the expanded graphite includes an expanded graphite base material in which expanded graphite particles are pressurized to be integrated with each other, said expanded graphite base material being subjected to a material removal process wherein a surface layer has been removed such that the weight of said expanded graphite base material is reduced within a range of 0.5% to 3%.
A sealing material of expanded graphite, wherein the expanded graphite includes an expanded graphite base material having a surface layer portion in which expanded graphite particles are pressurized to be integrated with each other, said expanded graphite base material being subjected to a removal process wherein a surface layer has been removed such that a diffraction peak of an X-ray diffraction of an exposed surface of said expanded graphite base material is in a range of 26.52.degree. to 26.48.degree..
A sealing material of expanded graphite, wherein the expanded graphite includes an expanded graphite base material having a surface layer portion in which expanded graphite particles are pressurized to be integrated with each other, said expanded graphite base material being subjected to a removal process wherein a surface layer has been removed such that a diffraction peak of an X-ray diffraction of an exposed surface of said expanded graphite base material is in the range of 26.53.degree. to 26.45.degree..
A method of producing a sealing material from expanded graphite, comprising the steps of:
A method of producing a sealing material from expanded graphite, comprising the steps of:
Dependencies are inferred from the claim text.