By James J. Licari
This primary booklet within the fabrics and techniques for Electronics purposes sequence solutions questions very important to the winning layout and production of digital parts, modules, and structures resembling: - How can one safeguard digital assemblies from lengthy excessive humidity, excessive temperatures, salt spray or different terrestrial and area environments? - What coating kinds can be utilized to guard microelectronics in army, house, car, or clinical environments? - How can the chemistry of polymers be correlated to fascinating actual and electric homes? - How can a layout engineer steer clear of next capability disasters as a result of corrosion, steel migration, electric degradation, outgassing? - What are the easiest tactics that production can use to masks, fresh, organize the outside, dispense the coating, and remedy the coating? - What caliber coverage and in-process assessments can be utilized to guarantee reliability? - What govt or requisites can be found? - How can natural coatings be chosen to satisfy OSHA, EPA, and different rules? in addition to a dialogue of the normal roles of coatings for moisture and environmental safety of published circuit assemblies, this publication covers dielectric coatings that offer electric capabilities resembling the low-dielectric-constant dielectrics used to manufacture multilayer interconnect substrates and high-frequency, high-speed circuits. fabrics engineers and chemists will gain significantly from a bankruptcy at the chemistry and homes of the most varieties of polymer coatings together with: Epoxies, Polyimides, Silicones, Polyurethanes, Parylene, Benzocyclobenzene etc. For production body of workers, there's a complete bankruptcy of over a dozen methods for overlaying, cleansing, and floor education and a accomplished assessment of over 20 techniques for the appliance and curing of coatings together with fresh extrusion, meniscus, and curtain coating equipment utilized in processing huge panels. the professionals and cons of every technique are given to help the engineer in picking the optimal technique for his/her program. As an advantage, from his personal event, the writer discusses a few caveats that may aid lessen expenditures and steer clear of disasters. ultimately, the writer discusses rules of OSHA, EPA, and different govt enterprises that have ended in formula adjustments to satisfy VOC and toxicity necessities. Tables of various army, advertisement, undefined, and NASA requirements are given to aid the engineer pick out the correct callout.
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Additional resources for Coating Materials for Electronic Applications: Polymers, Processing, Reliability, Testing
It has been observed that under suitable environmental conditions the enzymatic action of microorganisms converts the plasticizers in vinyl resins to watersoluble salts that can then be easily extracted. Stiffening, weight loss, and dimensional changes may follow. Air and water entering the tunnels left by extraction cause further erosion. This process continues until the tunnels penetrate the entire material and destroy its physical integrity. Further, the electrolytic solutions that may collect in the crevices and tunnels degrade the electrical insulation properties of the coating.
10. ) Name/Type Dow 19/Dilute chromic acid Dow 23/Stannate immersion MIL spec MIL-M3171 Type 6 - AMS spec 2475 - Appearance Uses Comments Brass to brown Touch up treatment; used as paint base when refinishing Less critical than Dow 1 by brushing, solution not harmful if trapped in joints Medium to dark gray Good paint base and protective finish; used with dissimilar metal inserts (except A1 or in assemblies) Must be neutralized if painted, retards galvanic corrosion 30 Coating Materials for Electronic Applications improve the adhesion of subsequently applied organic coatings (MIL-A8625).
This prevents particles that may detach later from affecting the circuit. Parylene and silicones have received the greatest attention as particle immobilizing coatings because of their high purity, lowtemperature processing, low outgassing, and compatibility with semiconductor devices. Both materials are used in high-reliability hybrid microcircuits and multichip modules (see also Ch. 4). Particle Getters. Plastic resins that cure to a tacky state may be used as alternates to coatings in immobilizing particles.