Abstract: In the inner portion of a spherical annular seal member (55) extending from a cylindrical inner surface (52) to an outer surface (53) formed in the shape of a partially convex spherical surface, a heat-resistant sheet member (3) having a heat-resistant coating (2) on overall surfaces of a heat-resistant sheet and a reinforcing member (9) constituted by a metal wire net (8) are compressed and intertwined with each other, and are thus arranged to be provided with structural integrality. The outer surface (53) formed in the shape of the partially convex spherical surface is constituted by an exposed surface of an outer surface layer (56) formed of the heat-resistant coating (2), and the reinforcing member (9) constituted by the metal wire net (8) formed integrally with the outer surface layer (56) is disposed in the outer surface layer (56).

Abstract: A spherical annular seal member which has a cylindrical inner surface defining a through hole in a central portion thereof, an outer surface formed in the shape of a partially convex spherical surface, and an annular end face on a large-diameter side of the outer surface, and which is used particularly in an exhaust pipe joint, comprises: a reinforcing member made from a compressed metal wire net; a heat-resistant material filling meshes of the metal wire net of the reinforcing member and compressed in such a manner as to be formed integrally with the reinforcing member in mixed form, the heat-resistant material and the reinforcing member being provided as principal components in an inner portion of the spherical annular seal member which extends from the cylindrical inner surface to the outer surface formed in the shape of the partially convex spherical surface, boron carbide, a metal boride, a metal fluoride, graphite, and aluminum phosphate being also formed integrally with the reinforcing member and the h

Abstract: A spherical annular seal member which has a cylindrical inner surface defining a through hole in a central portion thereof as well as an outer surface formed in the shape of a partially convex spherical surface, and which is used particularly in an exhaust pipe joint, includes: a reinforcing member made from a compressed metal wire net; a heat-resistant material filling meshes of the reinforcing member and compressed in such a manner as to be formed integrally with the reinforcing member in mixed form, the heat-resistant material and the reinforcing member being provided as principal components in an interior portion of the spherical annular seal member which extends from the cylindrical inner surface to a vicinity of the outer surface formed in the shape of the partially convex spherical surface, aluminum phosphate being also formed integrally with the reinforcing member and the heat-resistant material in mixed form; a sliding layer formed of a lubricating composition which is constituted of boron nitride an

Abstract: Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-metal borides showing a friction coefficient of 0.01 to 0.09 and a specific amount of abrasion of 1.0 to 4.0.times.10.sup.-8 mm.sup.2 /kg under the measuring conditions of a load of 20 kg/cm.sup.2 and a sliding velocity of 5 m/min at an atmosphere temperature of 300.degree. C., a bending strength of 230 to 900 kg.f/cm.sup.2 and a Shore hardness of 28 to 45, produced by sintering (a) 70 to 93% by weight of amorphous carbon powder, (b) 5 to 20% by weight of at least one boride of a metal of IVa group, Va group of VIa group of the periodic table and (c) 2 to 10% by weight of powdery natural graphite, powdery Kish graphite or a mixture thereof.

Abstract: Disclosed herein is a high temperature-resistant and abrasion-resistant sliding member of graphite-boron carbides showing the friction coefficient of 0.01 to 0.13 and the specific abrasion amount of 10.sup.-7 to 10.sup.-9 mm.sup.2 /kg under the measuring conditions of the load of 20 kg/cm.sup.2 and the sliding velocity of 5 m/min at a temperature of 300.degree. C., the bending strength of 300 to 1600 kg.f/cm.sup.2 and the Shore hardness of from 45 to 60, obtained by mixing and stirring from 65 to 95% by weight of powdery carbon of an average particle size of 10 to 150 .mu.m and from 5 to 35% by weight of powdery boron carbide of an average particle size of 0.5 to 2.5 .mu.m until the powdery boron carbide is uniformly dispersed in the powdery carbon, and sintering the thus formed mixture at a temperature of 2020.degree. C. or more and less than the transition point at which the structure of carbon and boron carbide in the thus formed mixture is remarkably changed, under a pressure of 100-250 kg/cm.sup.2.