Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Nanoceramic and Polytetrafluoroethylene Polymer Composites for Mechanical Seal Application at Low Temperature

  • Okhlopkova, A.A. (Department of Chemistry, North-Eastern Federal University) ;
  • Sleptsova, S.A. (Department of Chemistry, North-Eastern Federal University) ;
  • Alexandrov, G.N. (Department of Chemistry, North-Eastern Federal University) ;
  • Dedyukin, A.E. (Department of Chemistry, North-Eastern Federal University) ;
  • Shim, Ee Le (Department of Physics, Myongji University) ;
  • Jeong, Dae-Yong (School of Materials Engineering, Inha University) ;
  • Cho, Jin-Ho (Department of Chemistry, North-Eastern Federal University)
  • Received : 2012.09.28
  • Accepted : 2013.02.05
  • Published : 2013.05.20
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Abstract

We investigated the tribochemical and wear properties of Polytetrafluoroethylene (PTFE) based polymer matrix composites with nanoceramic (NC) ${\beta}$-sialon, and $Al_2O_3$ particles for the mechanical seal applications at low temperature. SEM showed that NC particles were homogeneously distributed in the polymer matrix and initiated the formation of the supramolecular spherulites around NC. From the temperature stimulated depolarization (TSD) current results, it was analyzed that the surface charge on nanoceramic affected the formation of the spherulites structure. 2 wt % $Al_2O_3$ NC did not degrade the mechanical properties of PTFE so that composites showed the similar values of tensile strength, elongation at the rupture and friction coefficient as those of neat PTFE. However, the composite with 2 wt % $Al_2O_3$ NC revealed the improved wear resistance, wear rate of 0.4-1.2 mg/h at room temperature and 0.28 mg/h at $-40^{\circ}C$, respectively, while the neat PTFE the 70-75 mg/h at room temperature and 70.3 mg/h at $-40^{\circ}C$.

Keywords

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