Breviary Technical Ceramics


      Joining and Bonding Techniques




8.2.2 Potting with Plastic

The use of plastics is limited if

  • there is friction resulting in wear,
  • higher temperatures bring a deterioration in insulation capacity or
  • the mechanical strength falls with rising temperature.


Figure 202: Ceramic component potted in plastic

Armouring the area at risk with ceramic may be a solution in these cases. The ceramic insert is placed inside the injection mould, and is encased and fixed when the plastic is injected for the component. To achieve the necessary tolerances of 0.01 mm the insert must usually be hard machined so that the molten plastic cannot leak out at the injection stage. The insert will be more effectively anchored if there are openings in the material and if the insert has a shape that engages the plastic from behind.

This type of insertion creates a joint with relatively high mechanical strength, and avoids additional stresses on the other material. The materials combination of polyamide with ceramic has been particularly well tried in this context.

Figure 203: Traversing thread guides


Figure 204: Other ceramic components encased
by injection moulding



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