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*'''Dimensions'''
Dimensions
Coating thickness: 10 nm - 15 μm
Coating thicknesses for contact applications: 0.1 - 10 μm
For the geometry of semi-finished products to be coated there are few
restrictions. Only the coating of the inside of machined holes and tubing has
limitations.
*'''Tolerances'''
Coating thickness +10 - 30 %, depending on the thickness
*'''Quality criteria'''
Depending on the application the following parameters are tested and recorded
(see also: Electroplating of parts):
*Coating thickness *Solderability
*Adhesion strength *Bonding property
*Porosity *Contact resistance
These quality tests are performed according to industry standards, internal
standards, and customer specifications resp.
===7.3 Comparison of Deposition Processes===
The individual deposition processes have in part different performance
characteristics. For each end application the optimal process has to be chosen
considering all technical and economical factors. The main selection criteria
should be based on the electrical and mechanical requirements for the contact
layer and on the design characteristics of the contact component. Table 7.7
gives some indications for a comparative evaluation of the different coating
processes.
The electroless metal coating is not covered here because of the low thickness
of deposits which makes them in most cases not suitable for contact
applications.