By James J. Licari
This primary e-book within the fabrics and procedures for Electronics purposes sequence solutions questions very important to the winning layout and production of digital parts, modules, and structures reminiscent of: - How can one shield digital assemblies from lengthy excessive humidity, excessive temperatures, salt spray or different terrestrial and house environments? - What coating kinds can be utilized to guard microelectronics in army, house, automobile, or scientific environments? - How can the chemistry of polymers be correlated to fascinating actual and electric houses? - How can a layout engineer keep away from next strength disasters as a result of corrosion, steel migration, electric degradation, outgassing? - What are the simplest approaches that production can use to masks, fresh, arrange the outside, dispense the coating, and therapy the coating? - What caliber insurance and in-process checks can be utilized to guarantee reliability? - What govt or necessities can be found? - How can natural coatings be chosen to fulfill OSHA, EPA, and different laws? along with a dialogue of the conventional roles of coatings for moisture and environmental defense of published circuit assemblies, this e-book covers dielectric coatings that offer electric features reminiscent of the low-dielectric-constant dielectrics used to manufacture multilayer interconnect substrates and high-frequency, high-speed circuits. fabrics engineers and chemists will profit tremendously from a bankruptcy at the chemistry and houses of the most varieties of polymer coatings together with: Epoxies, Polyimides, Silicones, Polyurethanes, Parylene, Benzocyclobenzene etc. For production team of workers, there's a whole bankruptcy of over a dozen methods for protecting, cleansing, and floor training and a finished assessment of over 20 procedures for the applying and curing of coatings together with fresh extrusion, meniscus, and curtain coating tools utilized in processing huge panels. the professionals and cons of every procedure are given to assist the engineer in picking the optimal approach for his/her program. As an advantage, from his personal event, the writer discusses a few caveats that might aid lessen charges and stay away from disasters. eventually, the writer discusses laws of OSHA, EPA, and different govt corporations that have led to formula adjustments to satisfy VOC and toxicity necessities. Tables of various army, advertisement, undefined, and NASA standards are given to assist the engineer pick out the right kind callout.
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Additional resources for coating materials for electronic applications polymers processes reliability testing
Volume resistivities of some familiar materials are compared in Fig. 5. Note the large difference (up to 24 orders of magnitude) between the most conductive materials such as copper and silver and the least conductive such as polytetrafluoroethylene and polystyrene. Insulation resistance should not be considered the equivalent of dielectric breakdown voltage. Although clean dry coatings may have very high insulation resistances, they may have poor dielectric breakdown voltages because of voids, pinholes, or other coating imperfections.
CoF is a measure of the ease with which two surfaces Chapter 1 - Functions and Requirements 17 slide against each other or, conversely, the resistance to sliding. Plastics and polymer coatings are generally tested against polished steel according to equipment and methods defined in ASTM D3702 or ASTM D1894. Among the best low-CoF materials are the fluorocarbons, notably Teflon, and the polyamides such as nylon. Because Teflon is inherently mechanically weak, it is used as a filler in the more abrasion resistant, harder coatings such as epoxies or polyurethanes.
This is the point at which no further increase in weight occurs. Precise gravimetric measurements may be made using a microbalance or electrobalance. Suppliers generally report water absorption data based on ASTM D570-98 where a weighed sample is exposed for 24 hours in water at room temperature or at an elevated temperature and then reweighed. This is a convenient and rapid method to compare coatings, but may not represent the full saturation amount, which may take weeks to develop. 1 gives some water absorption values for various polymer types.
coating materials for electronic applications polymers processes reliability testing by James J. Licari