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Created page with "Besides manufacturing contact materials from the solid phase, i.e. by melt or powder metallurgy, the production starting in the liquid or gaseous phase is generally preferred ..."
Besides manufacturing contact materials from the solid phase, i.e. by melt or
powder metallurgy, the production starting in the liquid or gaseous phase is
generally preferred when thin layers in the μm range are required which cannot
be obtained economically by conventional cladding methods. Such coatings
fulfill different requirements depending on their composition and thickness.
They can serve as corrosion or wear protection or can fulfill the need for thin
contact layers for certain technical applications. In addition they serve for
decorative purposes as a pleasing and wear resistant surface coating.
Table 7.1: Overview of Important Properties of Electroplated Coatings
and their Applications
To reduce the mechanical wear of thin surface layers on sliding and connector
contacts additional lubricants in liquid form are often used. On silver contacts
passivation coatings are applied as protection against silver sulfide formation.
===7.1 Coatings from the Liquid Phase===
For thin coatings starting from the liquid phase two processes are used
differentiated by the metallic deposition being performed either with or without
the use of an external electrical current source. The first one is electroplating
while the second one is a chemical deposition process.
===7.1.1 Electroplating (or Galvanic Deposition)===
powder metallurgy, the production starting in the liquid or gaseous phase is
generally preferred when thin layers in the μm range are required which cannot
be obtained economically by conventional cladding methods. Such coatings
fulfill different requirements depending on their composition and thickness.
They can serve as corrosion or wear protection or can fulfill the need for thin
contact layers for certain technical applications. In addition they serve for
decorative purposes as a pleasing and wear resistant surface coating.
Table 7.1: Overview of Important Properties of Electroplated Coatings
and their Applications
To reduce the mechanical wear of thin surface layers on sliding and connector
contacts additional lubricants in liquid form are often used. On silver contacts
passivation coatings are applied as protection against silver sulfide formation.
===7.1 Coatings from the Liquid Phase===
For thin coatings starting from the liquid phase two processes are used
differentiated by the metallic deposition being performed either with or without
the use of an external electrical current source. The first one is electroplating
while the second one is a chemical deposition process.
===7.1.1 Electroplating (or Galvanic Deposition)===
