Electronic components have invisible leakage channels

The thermal expansion coefficients of metals and plastics are different, and they are in complex environments under conditions such as cold and hot cycles. When electronic components (such as transmission pressure sensors) are heated, these micropores and gaps form leakage channels, which can allow moisture and other corrosive substances to penetrate the substrate, causing short circuits, reducing the lifespan of electronic components, and leading to complete failure or poor connection of electronic components. It is necessary to seal automotive electronic components to prevent their failure.

"Silent" vacuum infiltration makes defects nowhere to escape

For the sealing problem of electronic components, automotive electronic component manufacturers can adopt different processes according to their own situation to achieve different sealing effects.

The most common methods are epoxy sealing and surface coating, which have the advantages of being fast and simple, but their disadvantages are

1. Only the surface parts of the sealed components can be sealed

By contrast, it increases the weight of components and changes the size of components

3. The sealant is completely exposed to the environment and is prone to degradation

4. The sealing path between metal and plastic is very short, resulting in low thermal stress

Epoxy sealing (left) and silicone sleeve (right)

Another method is the silicone fiberglass sleeve, but this method cannot avoid the difference in thermal expansion coefficient between the silicone and the metal wrapped around it.

Another method is to use gaskets or O-rings, which have the advantage of being easy to install and replace, but their disadvantage is

1. It can only seal the upper surface and is not suitable for use with lead frames and flat pins

2. Over time, the O-ring is prone to becoming dry and brittle

3. There are assembly costs and inventory costs

Han Gao Le Tai vacuum infiltration (fluorescent lines are resin sealed)

Since the 1960s, it has been successfully applied in the sealing of pores in castings and powder metallurgy parts through the application of Han Gao Le Tai vacuum infiltration. Since the 1990s, vacuum infiltration has been used for sealing electronic components, using pressure to silently immerse organic resin into the leakage channel of electronic components to achieve complete sealing. Therefore, it allows the use of electronic components that will be discarded due to porosity, and its advantages are

1. High degree of automation and good processing consistency (very important for the automotive industry)

2. No impact on appearance and size

3. Solvent resistant (engine oil, gasoline, brake oil, refrigerant, and organic solvents, etc.)

4. High temperature resistance (up to 177 ° C), durability, and the ability to maintain flexibility during high and low temperature cycles or impacts

5. No adverse effects on conductivity, high efficiency (1 processing unit can infiltrate 2500 wire harnesses per hour)