Patent ID: 9091381
Filing Date: 2015-07-28
Classification: F01N,F16J,F16L

Abstract:
1. A spherical annular seal member for use in an exhaust pipe joint 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 on said partially convex spherical surface of said spherical annular base member, wherein said spherical annular base member includes a reinforcing member made from a metal wire net and a heat-resistant material containing expanded graphite at a ratio of 88.0 to 99.5% by mass and at least a phosphate at a ratio of 0.5 to 12% by mass and compressed in such a manner as to fill meshes of the metal wire net of said reinforcing member and to be integrated with said reinforcing member in mixed form, and said outer layer includes a heat-resistant material containing expanded graphite at a ratio of 88.0 to 99.5% by mass and at least a phosphate at a ratio of 0.5 to 12% by mass and a reinforcing member made from a metal wire net integrated with said heat-resistant material in mixed form, the expanded graphite in said heat-resistant material having an ash content of not more than 0.1% by mass and a graphite content of not less than 99.8% mass.