Conduction principle of conductive adhesive
Time
2023-03-13 16:31
Source:
1. Contact between conductive particles
Form a conductive path, so that the conductive adhesive has electrical conductivity, the stable contact between the particles in the adhesive layer is caused by the conductive adhesive curing or drying. Conductive adhesive before curing or drying, conductive particles are separated in the adhesive, there is no continuous contact with each other, so in the state of insulation. Conductive adhesive curing or drying, due to solvent volatilization and adhesive curing caused by the shrinkage of the adhesive volume, the conductive particles between each other is stable continuous state, thus showing electrical conductivity.
2. Tunnel effect forms a certain current path between particles
When the directional motion of free electrons in conducting particles is impeded, this obstruction can be regarded as a barrier with a certain potential energy. According to the concept of quantum mechanics, for a microscopic particle, even if its energy is smaller than the energy of the barrier, it has the possibility of passing through the barrier in addition to being reflected. The phenomenon of microscopic particles passing through the barrier is called penetration effect, or tunnel effect. The electron is a kind of microscopic particle, so it has the possibility of passing through the barrier of separation layer between conducting particles. The probability of electron passing through the isolation layer is related to the thickness of the isolation layer and the difference between the energy of the barrier and the energy of the electron. The smaller the thickness and the difference, the greater the probability of electron passing through the isolation layer. When the thickness of the insulating layer is small enough, electrons can easily pass through the thin insulating layer, making the insulating layer between conducting particles become conductive. The conductive layer produced by the tunneling effect can be equivalent to a resistor and a capacitor.
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