Comformal Coating三*漆 Applications

            GLOBOND三*漆 Precision *og circuitry may suffer degraded accuracy if insulating surfaces become contaminated with ionic substances such as fingerprint residues, which can become weakly conductive in the presence of moisture. (The cl*ic symptom of micro-contamination on an *og circuit board is sudden changes in performance at high humidity, for example when a technician breathes on it). Furthermore, a suitably chosen material coating has proved to actually reduce the effects of mechanical stress and vibrations on the circuit and its ability to cope in extreme temperatures.

(Globond三*漆)For example, in a chip-on-board *embly process, a silicon die is mounted on the board with an adhesive or a soldering process, then electrically connected by wire bonding, t*ically with .001-inch-diameter gold or aluminum wire. The chip and the wire are very delicate, so they're encapsulated in a version of conformal coating called "glob *." This prevents accidental contact from damaging the wires or the chip. Another use of conformal coating is to increase the voltage rating of a dense circuit *embly; an insulating coating can withstand a much stronger electric field than air, particularly at high altitude.

(Globond三*漆)With the exception of parylene, most organic coatings are readily penetrated by water molecules. A coating preserves the performance of precision electronics primarily by preventing ionizable contaminants such as salts from reaching circuit nodes, and combining there with water to form a microscopically thin electrolyte film. For this reason, coating is far more effective if all surface contamination is removed first, using a highly repeatable industrial process such as vapor degreasing or semi-aqueous washing in a special machine. Extreme cleanliness also greatly improves adhesion. Pinholes would defeat the purpose of the coating, because a continuous contaminant film would be able to make contact with the circuit nodes and form undesired conductive paths between them.

三*漆,*三*漆,*三*漆,东莞宝涵

Link: The present article repinted from DONG GUAN BAOHAN INDUSTRIAL TECH*LOGY CO.,LTD.
           https://www.baohan-technology.com
           https://www.globond.us