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40 Inventive Principles
Porous Materials

a) Make an object porous or add porous elements: inserts, covers, etc.

b) If an object is already porous, fill the pores with a useful substance.
 
EXAMPLE:
  1. Using porous aluminium instead of the solid material brings a weight reduction of up to 10%, and gives it improved damping properties with a relatively high compression strength.
  2. Some parts of an electric machine are constructed using porous material (or covered with a porous material), which is soaked in a liquid coolant. Should the machine overheat, the stored coolant evaporates, cooling it down rapidly and evenly without the need for an external cooling system.
  3. A porous, heat resistant rod soaked with alloy additives, is used to add these substances to the casting.