| 摘要 |
PROBLEM TO BE SOLVED: To obtain a composition exhibiting low friction and excellent resistance to abrasion and to creep under lubrication with an oil by mixing a polytetrafluoroethylene resin, a metallic powder having a specific particle size and a powder obtained by crushing a molded article made of a polytetrafluoroethylene resin composition each in a specific amount. SOLUTION: The titled resin composition comprises 25-90 pts.vol. of a polytetrafluoroethylene resin, 5-40 pts.vol. of metallic powder having an average particle size of 2-150μm and a Mohs' hardness of 3-4 such as powder of copper or a copper alloy, 5-35 pts.vol. of powder having a particle size of 250μm or less obtained by crushing a molded article made of a resin composition comprising a polytetrafluoroethylene resin only or a polytetrafluoroethylene resin containing a non-thermoplastic polyimide resin, and, if necessary, a pigment such as titanium oxide, iron oxide or the like. The powder of this composition is put into a specified metal mold and subjected to a pressure of 40-100 MPa to carry out preforming. And the compression molded body is taken out and burned at 360-380 deg.C to give a molded body. |
