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Specialized Processes: Copper Infiltration
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Copper infiltration is the process of filling the pores of a sintered or unsintered powder metal compact with a metal or alloy of lower melting point. Typically, an infiltrant-grade copper is conventionally compacted into a simple preform such as a disc, ring or bar. The preform is then put into contact with an iron compact and sintered together.
This process has been used for decades to enhance the mechanical properties of P/M parts and seal porosity. Always on the leading edge of process technology, GKN continually seeks even better copper infiltration techniques – such as the use of copper stampings to facilitate the infiltration process. This patent-pending technique has been shown to provide an improved distribution of the copper within the part, thereby improving dimensional stability as well as erosion, oxidation and residue issues. Click for more info: 
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