Coating delicate circuits

摘要

Protective and security coatings are applied to an integrated circuit by periodically passing the integrated circuit through a flame spray containing molten particles of the coating composition. The integrated circuit is attached to a fixture that is cooled with a coolant that is applied to the integrated circuit. The distance between the flame spray gun and the integrated circuit is controlled so that the particles are molten when they strike the circuit but the circuit heating is minimized. A flame resistant mask retains the integrated circuit on the fixture. The mask is constructed of a low thermally conductive material and the fixture is constructed of a high thermally conducive material.