Antimony-Impregnated Carbon Graphite

Carbon/Graphite and Graphite Materials are inherently porous after the material processing.  It is common to impregnate these materials with a Resin or Metal to:

  • Increase the Strength,
  • Increase the Thermal Conductivity,
  • Reduce the Resistivity,
  • Reduce the Porosity, and/or
  • Impart Impermeability.

These benefits can lead to secondary benefits such as the impregnation with Antimony reducing the Porosity leading to a reduction in Blister formation particularly in light Hydrocarbon and hot Oil applications.

Some end-users experience that certain impregnants such as Babbitt (particularly Leaded Babbitt), Silver, and Antimony improve the friction and wear characteristics of the Carbon/Graphite or Graphite Component.  While this beneficiation may be actual, we have not seen this effect in laboratory testing.

Antimony is uniquely efficient at reducing porosity in Carbon/Graphite and Graphite materials.  This is due in part to the low Surface Temperature of the molten metal.

Metal Surface Tension1
Antimony (Sb) 367
Copper (Cu) 1290
Silver (Ag) 951
Tin (Sn) 570

1 at impregnation Temperature

Antimony melts at 1,167 °F (630.63 °C) which does constrain its application temperature limits.

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