By James J. Licari
This primary publication within the fabrics and strategies for Electronics functions sequence solutions questions important to the winning layout and production of digital elements, modules, and platforms corresponding to: - How can one guard digital assemblies from lengthy excessive humidity, excessive temperatures, salt spray or different terrestrial and house environments? - What coating forms 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 houses? - How can a layout engineer stay away from next power mess ups as a result of corrosion, steel migration, electric degradation, outgassing? - What are the easiest techniques that production can use to masks, fresh, organize the skin, dispense the coating, and treatment the coating? - What caliber insurance and in-process exams can be utilized to guarantee reliability? - What executive or necessities can be found? - How can natural coatings be chosen to satisfy OSHA, EPA, and different laws? along with a dialogue of the conventional roles of coatings for moisture and environmental safety of published circuit assemblies, this publication covers dielectric coatings that supply electric services comparable to the low-dielectric-constant dielectrics used to manufacture multilayer interconnect substrates and high-frequency, high-speed circuits. fabrics engineers and chemists will profit enormously from a bankruptcy at the chemistry and homes of the most different types of polymer coatings together with: Epoxies, Polyimides, Silicones, Polyurethanes, Parylene, Benzocyclobenzene and so forth. For production group of workers, there's a complete bankruptcy of over a dozen methods for protecting, cleansing, and floor training and a accomplished evaluate of over 20 approaches 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 process are given to assist the engineer in choosing the optimal process for his/her software. As an advantage, from his personal adventure, the writer discusses a few caveats that would support lessen expenses and steer clear of mess ups. ultimately, the writer discusses rules of OSHA, EPA, and different executive organisations that have led to formula adjustments to fulfill VOC and toxicity necessities. Tables of diverse army, advertisement, undefined, and NASA requisites are given to assist the engineer opt for the right kind callout.
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Extra resources for coating materials for electronic applications polymers processes reliability testing
However, the high reactivity of magnesium-lithium with moisture and carbon dioxide limits its use to hermetically-sealed enclosures containing dry inert gas. Even in an enclosed sealed box, an incompatible situation can arise when moisture evolves from plastic or from other components within the enclosure. Moisture reacts with the lithium portion of the alloy, forming hydrogen gas and lithium hydroxide. In the presence of carbon dioxide, white lithium carbonate powder forms on the surface of the alloy.
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.
Metal migration, especially silver migration, occurs between closely spaced conductor lines in the presence of moisture and an applied voltage. It results in reduction of insulation resistance, an increase in current leakage, and eventual catastrophic shorting. 5 on Reliability). A rapid test consists of applying a drop of water across closely spaced conductors with an applied bias of several volts. The absence or presence of metal migration can be determined visually. The same test can be used to assess the effectiveness of an overcoating to prevent or minimize metal migration.