Patent ID: 7413195
Filing Date: 2008-08-19
Classification: C09K,F01N,F16J,F16L

Abstract:
1. A spherical annular seal member, comprising: a spherical annular base member defined by a cylindrical inner surface, a partially convex spherical surface, and large- and small-diameter-side annular end faces of said partially convex spherical surface; and an outer layer formed integrally with said partially convex spherical surface of said spherical annular base member, said spherical annular base member including a reinforcing member made from a compressed metal wire net and a heat-resistant material filling meshes of said metal wire net of said reinforcing member, compressed in such a manner as to be formed integrally with said reinforcing member in mixed form, and containing expanded graphite and an organic phosphorus compound, said outer layer including a heat-resistant material containing expanded graphite and an organic phosphorus compound, and the reinforcing member constituted by the metal wire net integrated with said heat-resistant material in mixed form, an outer surface of said partially convex spherical surface exposed to an outside in said outer layer being formed into a smooth surface in which said heat-resistant material and said reinforcing member are integrated in mixed form, wherein said heat-resistant material contains 0.1 to 10.0 wt. % of said organic phosphorus compound and 90.0 to 99.9 wt. % of said expanded graphite, and said organic phosphorus compound is selected from the group consisting of an organic phosphinic acid, an organic phosphinic ester, a phosphorous ester and a hypophosphorous ester, the organic phosphinic acid or the organic phosphinic ester being represented by the following general formula (2): wherein R