Braking band composite structure of a brake disc

A method for making a composite structure or a portion of a composite structure of a braking band of a brake disc comprising the following steps:

• making a composite ceramic structure, comprising silicon, silicon carbides and carbon not bonded to silicon, obtaining a body of a braking band comprising at least one braking surface, said carbon not bonded to silicon being present substantially in the form of carbon fibre filaments;
• processing said braking surface removing a surface layer so as to have said carbon not bonded with silicon on the surface;
• removing from the surface at least partly and mainly selectively the carbon not bonded with silicon, leaving the silicon and the silicon carbides, thus obtaining at said braking surfaces a surface layer, consisting of silicon and silicon carbide, which exhibits micro-cavities due to the removal of the carbon not bonded with silicon;
• depositing an anchoring substrate of metal material directly on said braking surface from which at least partly and mainly selectively the carbon not bonded with silicon has been removed, said anchoring layer only partly filling said micro-cavities and strictly following the profile of said micro-cavities;
• and
• depositing a protective coating made with oxides on said anchoring substrate.