Is copper paste useful for pc boards (is copper paste useful for pc boards toxic)

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• 1、Which is more suitable for use on PCB boards, conductive copper paste or conductive silver paste?

Which is more suitable for use on PCB boards, conductive copper paste or conductive silver paste?

Conductive silver paste is more suitable for use on PCB boards. Here are the specific reasonsIs it useful to use copper paste for pc boards: Conductivity: Conductive silver pasteIs it useful to use copper paste for pc boardsCompared with the same type of conductive copper paste, the electrical conductivity is much superior. Especially the resistance after curingIs it useful to use copper paste for pc boardsThe resistance of silver paste is tens or even hundreds of times lower than that of copper paste, which means that using silver paste on PCB boards can provide better current conduction. Thermal conductivity: Conductive silver paste also has excellent thermal conductivity, which is very important for PCBs that need heat dissipation.

Copper-nickel composite slurry: Adding nickel powder to improve oxidation resistance while maintaining high conductivity, suitable for outdoor industrial control inductors. Nickel, a nickel-based alternative material, has strong chemical stability, but its conductivity is only 1/5 of that of silver. It is mostly used in low-frequency inductor nickel powder conductive pastes with low conductivity requirements: it is mainly used for terminal electrodes of chip inductors, and the cost is only 1/15 of silver paste, but it needs to be matched with conductive glue to improve overall conductivity.

Comparative analysis of alternative materials ① Copper paste: The conductivity is close to silver and the cost is more than 40% lower. However, due to its easy oxidation, it needs to be matched with an anti-oxidation process. It is suitable for low-temperature baked flexible circuits, photovoltaic back-field electrodes and other scenarios.② Silver-coated copper paste: Taking into account the conductivity of silver and the economy of copper, the silver layer wraps copper particles to delay oxidation and gradually replace pure silver paste in LED chip bonding and thin film switching.

Silver glue filling, also known as silver oil plugging, is aimed at PCB high aspect ratio boards. For example, holes with a thickness of more than 180MIL are required to be plugged if holes are less than 0.3MM. Its advantages are: ensuring the conductivity of the through holes and the high aspect ratio board nickel cylinders have poor deep plating capabilities and cannot effectively resist etching. After plugging silver oil, it can ensure that the copper layer in the holes will not be etched away. The other is to increase the hardness of the PAD test point. Of course, some PCB boards are relatively thin and need to be filled with silver oil, which is based on customer needs.

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