| 摘要 |
According to one embodiment of the disclosure, an environmental protection coating comprises a circuit assembly (10;40;140) having a first protective dielectric layer (22;50;150) and a second dielectric layer (24;56;156). The circuit assembly has an outer surface (14;44) on which a plurality of discrete electrical components (16;46;216) are attached. The first protective dielectric layer (22;50;150) overlays the circuit assembly (10;40;140). The second dielectric layer (24;56;156) overlays the first protective dielectric layer and is made of a dielectric material having modulus of elasticity less than 3.5 Giga-Pascal (GPa), dielectric constant less than 2.7, dielectric loss less than 0.008, breakdown voltage strength in excess of 2 million volts/centimeter (MV/cm), temperature stability to 300° Celsius, defect densities less than 0.5/centimeter, pinhole free in films greater than 50 Angstroms, capable of being deposited conformally over and under 3D structures with thickness uniformity less than or equal to 10%. |
