| Two novel metal-PTFE self-lubricating bearings such as GCr15-PTFE composite bearing and Al alloy-PTFE fabric bearing were developed. GCr15-PTFE bearing was expected to be effectively strengthened leading to long service life. Al alloy-PTFE bearing was expected to be high specific strength composite.First, the structures of GCr15-PTFE bearing were designed using the ANSYS finite element method. Second, The adhesive strength tests were conducted by GB7124-1986 to select the optimal bond. Third, the optimal PTFE composite was selected, according to the ANSYS finite element design and adhesive strength experiment, and GCr15-PTFE bearing was prepared. Finally, another GCr15-MoS2 bearing was selected as a comparative investigation. The tribological tests were performed in an oscillating tribo-tester. Experimental conditions were normal pressure from 8 to18KN, an oscillating frequentcy of 8 times perminute, oscillating angles of±30°and relative humidity of (70±5)%. It is confirmed that GCr15-PTFE bearing exhibited better wear resistance and the longer wear life.An Al alloy-PTFE bearing composed of PTFE babric as the matrix, and adhesive resin as the binder, cohered onto a high strength Al alloy support. Another bearing(DU) was selected as a comparative investigation. Friction and wear tests were carried out in an oscillating tribo-tester. Experimental conditions were normal pressure from 10 to 80 MPa, an oscillating frequentcy of 8 times perminute, oscillating angles of±30°and relative humidity of (70±5)%. Results show that the Al alloy-PTFE bearing exhibited a lower coefficient of friction and longer wear life of 25,000 times than DU. |
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