Diamond-like nanocomposite coatings possessing high dielectric strength

Insulator failure, due to flashover or dielectric breakdown, is the cause of decreased system reliability and component lifetime in many plasma and microwave devices. Radiation effects, including ultraviolet radiation and ion-bombardment often accelerate insulator deterioration. Replacement of plastic insulators with ceramic insulators is not practical in many cases. We have studied the feasibility of utilizing the novel diamond-like nanocomposite (DLN) thin films to protect plastic insulators and extend lifetime by enhancing dielectric properties and flashover resistance. Very high dielectric strength (10/sup 7/-10/sup 8/ V/cm), and high flashover resistance at various pressures have been measured. The mechanisms of breakdown are currently under investigation. Applications exist in diverse areas including power transmission, slip rings, ultracapacitors, plasma switch technology, nuclear simulators and X-ray sources (e.g., Z-pinch devices).