Isotropic & Extruded Graphite

Graphite Dies, Molds & Crucibles For Casting Processes

PSS Technologies supplies isotropic and extruded graphite dies, molds and crucibles for a number of metallurgical applications, typically for melting and casting of non-ferrous metals such as gold, silver aluminium and brass. Graphite is perfectly suited to these processes due to it’s unique, inherent material characteristics; some of which are listed below.

  • High thermal conductivity
  • High temperature resistance (used up to 2760c in an inert atmosphere)
  • Very low thermal expansion coefficient (no distortion)
  • Corrosion resistant to acids and alkaline solutions
  • Excellent chemical stability (non reactive with non-ferrous alloys)

The high melting point of graphite, in combination with its low thermal expansion during heating allows for alloys to be cast in to complex shapes with extreme precision. The molds and crucibles used during casting must be able to withstand extremely high temperatures without distorting or cracking, and graphite provides the perfect material choice. Due to the excellent chemical stability of graphite at high temperatures, it is considered to be non-reactive when in contact with non-ferrous alloys, providing a clean and smooth surface finish for pouring and casting processes.

We can supply ‘make to print’ machined graphite components in small or large batch quantities, and can also offer our in-house design services to supply customised parts to compliment and improve your existing metallurgical processes.

Graphites for Electrical Discharge Machining (EDM)

Graphite is now the ‘go to’ electrode material used in EDM mold making with over 70% of customers now opting to use graphite instead of conventional copper as their preferred electrode material. This is because graphite offers the following key advantages over copper:

  • Reduced electrode machining times (this can offset graphite’s higher material cost)
  • Faster EDM times resulting in improved EDM machine throughput
  • A broader range of material characteristics (coarse and fine grain particle sizes)
  • Ability to handle high current densities allows for complex graphite electrode geometries
  • Lower electrode wear rates resulting in cost savings

A broad range of EDM graphites can be supplied with optimised material characteristics that are tailored to your application demands and key objectives. For example, larger grain graphites are best suited to roughing applications whilst fine grain graphites are chosen to produce the best surface finish. Differences in the grain size, flexural strength, density and hardness of graphite will influence the overall outcome and finish of the EDM process.

Please send through your EDM electrode requirements and our team of engineers will be able to select the best graphite electrode grade for your application.

Graphites for Vacuum Furnace Heat Treatment

For any enquiries related to graphite and graphite components, please contact sales@psstech.co.uk

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