Electret - comprising metal alloy coating for increased potential and

摘要

Electret consisting of a material having electretic properties (polymers, waxes, higher alcohols and esters, rock-crystal, Rochelle salt, ceramics, and ferrites), is provided, at least on one side, with a coating consisting of an alloy contg. at least one element of Fe, Co and Ni, and at least two elements of Fe, Co, Ni, Mn, si, Cu, S, V, Mo, C, Al and Zn. The assembly is polarised as a whole. The electretic potential is increased by 20-500%, and the service life is extended.