Verwendung von Komposit-Materialien, die Metallpartikel in einer isolierenden Oxidmatrix enthalten, als Dielektrika

Composite materials are used as dielectrica in electrical apparatus and components. Said composite materials are obtained a) by subjecting to the conditions of a complex forming reaction and hydrolytic polycondensation according to the sol-gel process one or more metal compounds in a liquid reaction medium (1) and (2) one or more bifunctional compounds, which have at least one group capable of complexing the metal and at least one group forming an anorganic network during polycondensation, and possibly (3) one or more networks capable of stringing during polycondensation, the compounds (1), (2) and (3) being soluble in the reaction medium, and b) by oxidizing the obtained polycondensate to form a composite material which contains small metallic and/or metal oxide particles having a very dense particle size distribution in an oxide matrix, and possibly c) by reducing the existing metal oxide particles to a metal. If necessary, a tempering or sintering treatment can be additionally perfo rmed in order to adjust the metal particles to a speciic size.