PROCESS FOR THE PREPARATION OF METALLIC WOOLS WITH A CONTROLLED DEGREE OF SURFACE OXIDATION AND FIBRES DERIVING FROM THEM: PRODUCTS OBTAINED, AND THEIR USE AS SUPPORTS TO OBTAIN METALLIC CORE COMPOSITE MATERIALS FOR A VARIETY OF APPLICATIONS

摘要

Disclosed is a process for the production of surface-oxidised metallic wools or fibres which involves dry scraping, with a set of grooved knives or equivalent tools, of a taut metallic wire which is made to slide between two rollers, characterised in that said process includes regulation of the wire­scraping temperature or subsequent heat treatment of the wire after cutting, to obtain controlled surface oxidation of the wool. The products obtained are useful as basic materials to prepare supports for catalysts and materials for various applications, such as sensors, catalysts or friction materials. Examples of coating of metallic wools and fibres with oxides, in particular ceramic oxides, for the creation of catalytic composite materials with a metallic core, are disclosed for this type of use.