- Jan 10, 2018 -
How to identify the material of PCB board
The PCB board material identification can be carried out from the following four aspects:
Besides paying attention to the XY axis (fiber direction and transverse direction) and Z axis (thickness direction of plate), it is easy to cause the rupture of silver gel conductor due to the factors of thermal expansion, cold shrinkage and heating decrement.
2.Electrical and water absorption
Many insulators reduce their insulation under the condition of moisture absorption, so that they provide the phenomenon of metal moving under the potential difference momentum. The FR-4 has dimensional safety. Electrical properties and water absorption are better than FR-1 and XPC, so in the production of silver perforated printed circuit boards, we should choose special FR-1 and XPC paper substrates.
Copper plating through hole is a kind of continuous crystal, it has very good ductility, it will not be like silver, carbon ink glue in hot expansion and cold shrinkage, easy to occur interface separation and reduce the conductivity.
Silver, copper are metal materials, easy to oxidize, reduce the effect of rust and migration, due to the difference in potential. Silver migration is easy to occur in silver ratio copper under potential difference driving force. The names of the circuit board are: PCB board, aluminum substrate, high frequency board, thick copper plate, impedance board PCB, ultra-thin circuit board, ultra-thin circuit board. Printed circuit board (copper etching technology), etc. The circuit board makes the circuit miniaturized and visualized, which plays an important role in the mass production of fixed circuit and the optimization of electrical appliance layout.