Question

Why does circuit board hole copper break?

Answer 1

Analysis and solutions to the causes of copper breakage in PCB circuit board holes are as follows:

1. Poor copper sinking, residue in the hole, roughness of the hole wall, drill deviation, chipping, excessive nail head, etc.

The hole copper is rough due to the cracking of the glass fiber in the hole wall, which breaks after high temperature; the solution is to optimize the drilling parameters to ensure that the hole thickness is qualified.

2. The local copper thickness caused by bubbles or debris in the hole is not enough, and the copper in the hole breaks after high temperature; the solution is to keep the liquid in the hole unobstructed.

3. Microcracks caused by metal fatigue are 45° oblique microcracks, often appearing along the crystal lattice, and often cracking on the copper wall at the junction of glass fiber and resin.

The copper plating itself has insufficient bonding force, causing it to break when exposed to high temperatures; the solution is to keep the brightener within a controlled range during electroplating.

Answer 2

The analysis of the causes of copper breakage in circuit board holes is as follows:
1. The plate has insufficient heat resistance.
2. There is a problem in the copper electroplating process of the through hole, which causes abnormal copper grains, causing the tensile strength and elongation capacity of the hole copper to be seriously insufficient.