By James J. Licari
This primary booklet within the fabrics and strategies for Electronics functions sequence solutions questions important to the profitable layout and production of digital elements, modules, and platforms equivalent to: - How can one safeguard digital assemblies from lengthy excessive humidity, excessive temperatures, salt spray or different terrestrial and house environments? - What coating varieties can be utilized to guard microelectronics in army, house, car, or scientific environments? - How can the chemistry of polymers be correlated to fascinating actual and electric homes? - How can a layout engineer steer clear of next power disasters because of corrosion, steel migration, electric degradation, outgassing? - What are the simplest procedures that production can use to masks, fresh, arrange the skin, dispense the coating, and therapy the coating? - What caliber insurance and in-process checks can be utilized to guarantee reliability? - What govt or standards can be found? - How can natural coatings be chosen to satisfy OSHA, EPA, and different rules? along with a dialogue of the conventional roles of coatings for moisture and environmental security of revealed circuit assemblies, this e-book covers dielectric coatings that offer electric features akin to the low-dielectric-constant dielectrics used to manufacture multilayer interconnect substrates and high-frequency, high-speed circuits. fabrics engineers and chemists will profit drastically from a bankruptcy at the chemistry and homes of the most kinds of polymer coatings together with: Epoxies, Polyimides, Silicones, Polyurethanes, Parylene, Benzocyclobenzene and so forth. For production team of workers, there's a complete bankruptcy of over a dozen methods for protecting, cleansing, and floor coaching and a accomplished evaluate of over 20 methods for the appliance and curing of coatings together with contemporary extrusion, meniscus, and curtain coating equipment utilized in processing huge panels. the professionals and cons of every procedure are given to assist the engineer in picking out the optimal approach for his/her program. As an advantage, from his personal event, the writer discusses a few caveats that may support lessen bills and keep away from mess ups. ultimately, the writer discusses laws of OSHA, EPA, and different executive firms that have led to formula alterations to fulfill VOC and toxicity specifications. Tables of diverse army, advertisement, undefined, and NASA standards are given to aid the engineer pick out the correct callout.
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Extra resources for coating materials for electronic applications polymers processes reliability testing
5 Handling and Abrasion Resistance Coatings provide handling protection from both physical abuse and from ionic residues from fingerprints. Coatings will increase the ruggedness of solder joints, wire bonds, and fragile components. As an example, 1-mildiameter aluminum or gold wire bonds that inherently may have a pull strength of 7 to 10 grams, if overcoated with parylene, are strengthened and require 20–30 grams to pull them to destruction. Coatings can strengthen other marginal wire bonds. There are some situations, however, where a coating has been known to stress interconnections due to its thickness and high expansion coefficient.
Water-drop test for a silver-platinum, thick-film conductor (complete bridging after 25 min, 4 Vdc). 2. Metal migration. Water-drop test for thick-film gold conductor (no evidence of metal migration after 1 hr, 4 Vdc). 2 Corrosion Protection Coatings may be applied to metal surfaces or between surfaces of dissimilar metals to protect them from direct chemical corrosion or from galvanic corrosion.  Direct Chemical Corrosion. 4. As a rule, elevated temperatures accelerate the rates of corrosion.
10. These surface treatments are all acid types that either neutralize or acidify the normally alkaline magnesium surface. Neutralizing the inherent alkalinity of magnesium is essential to improving adhesion and durability of subsequently applied paints and coatings. To be effective, primers for magnesium should be based on alkali-resistant vehicles such as polyvinyl butyral (contained in wash primers), acrylic, polyurethane, vinyl epoxy, or baked phenolic.  Chapter 1 - Functions and Requirements 27 For severe or extensive exposure, as might be encountered in ground or marine equipment, a durable finish system may consist of a conversion coating, a primer, and an organic topcoat.
coating materials for electronic applications polymers processes reliability testing by James J. Licari