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Parylene Applications - Magnets & Ferrite Cores
Ultra-thin Parylene conformal coatings provide magnet and ferrite core applications excellent dielectric properties. With a lower dielectric constant, lower dissipation factor and high dielectric strength compared to industry-standard coatings, Parylene coatings are uniquely suited for electrical insulation on miniature wire wound components. Parylene coatings also provide protection against abrasion damage that may occur during the winding process. Finally, Parylene's dry lubricity (low coefficient of friction) is also beneficial in the winding process.
Parylene Coating Benefits:
- The use of adhesive tape as insulation between winding and metal component is a well established process however as components get smaller, application of tape becomes difficult, in many instances resulting in less yield of acceptable parts. A coating of Parylene can virtually eliminate faulty components while improving electrical performance.
- Molded plastic NdFeB magnetic components are fragile and an additional advantage of a Parylene coating is increased strength. NdFeB material is also very susceptible to corrosion from atmospheric moisture. The extremely low water vapor transmission properties of Parylene provide excellent protection against corrosion.
- Parylene coatings often also offer a reduction in processing and labor costs since it is possible to coat many thousands of parts simultaneously using a tumble system during the vapor deposition process.
Liquid Coating
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Vacuum Deposition Parylene
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| Liquid Coatings do not provide even coverage across all surfaces of a coil form. Build-up of conventional coating material on a coil form can restrict windings capacity compared to an uncoated form or a form with a thin and uniform Parylene Coating. |
Thin and uniform Parylene coating has little effect on the shape and capacity of a coil form. |
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