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Spheres

Spheres
For decades Heraeus has been manufacturing spheres made from precious metals, precious metal alloys, as well as refractory metals, for various applications which call for absolute roundness and close tolerances in diameter. From the very outset, high quality and precision have been the main priorities behind design and installation of the corresponding production equipment.
Thanks to the precision spheres developed by the business unit Special Metals Technology new applications in the field of soldering and medical technology have been opened up.
Spheres made from precious metals respectively from precious metal alloys are increasingly replacing the usual contact rivet used in conventional construction. These spheres are bonded to the substrate by soldering or press-in operation.
Contact spheres are offered supplementary to the soldered contact parts which involve the use of sections of precious metal wires or bimetal profiles.

Advantages:
  • They can be transported relatively easily to the soldering station of the production equipment, since they no do have to be positioned in strict alignment to the insulator.
  • They form an excellent metallic contact bridge to the substrate and guarantee a favourable contact resistance behaviour.
  • The soldered joint offers great mechanical strength and low transition resistance.
  • The spheres have high thermal conductivity, thus reducing the electrical wear and tear to a minimum.
  • The spheres can be formed by coining after the soldering process.

Sizes and tolerances:
Heraeus precision contact spheres are normally produced in sizes ranging between 0.2 and 3.5 mm. The tolerances of diameter are between 0.01 and 0.05 mm.
In special cases closer tolerances can be agreed upon.

Materials:
  • Copper
  • Platinum Nickel
  • Silver
  • Silver with alloys of Nickel, Palladium, Copper
  • Tantalum

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