Patent ID: 8440295

Claim:
A mechanical seal device comprising: a rotating ring and a stationary ring, the rotating ring and the stationary ring being pressed against each other through sliding surfaces of the rotating ring and the stationary ring, the sliding surfaces of the rotating ring and the stationary ring forming seal surfaces, wherein the sliding surfaces of the rotating ring and the stationary ring are formed on their surfaces with resin layers having a plurality of porous parts containing fluorinated oil, the resin layers of the rotating ring and the stationary ring each are formed on respective substrates and comprise, in the same way, a first resin and a second resin having a melting point that is higher than a melting point of the first resin; the plurality of porous parts of the resin layer of the sliding surface for each of the rotating ring and the stationary ring are exposed to and open to an outside on the surface of the resin layer; the plurality of porous parts of both sliding surfaces of the rotating ring and the stationary ring are formed by heating the resin layers at a temperature of at least a melting point of the first resin and less than a melting point of the second resin to form the plurality of porous parts mainly inside of the resin layers; grinding the surfaces of the resin layers after heating to exposed the plurality of porous parts to the surfaces of the resin layers; said first resin is a polytetrafluoroethylene resin and/or its modified product; said second resin is a polyamide-imide resin and/or polyimide resin; a content of said first resin with respect to 100 wt % of said resin layer as a whole is 5 to 55 wt %; and the ratio of presence of the porous parts with respect to 100% of the surface of said resin layer as a whole is, in ratio of area, 1 to 10%.