Braking band of a disk for disk brake

A method for producing a braking band, the method comprising:

• providing a braking band comprising at least one braking surface, the braking band being made with an annular band body made of one of gray cast iron, steel, aluminum or alloys thereof;
• subjecting at least one portion of said at least one braking surface to a processing for increasing surface roughness thereof by removing swart or by laser engraving or by plastic deformation, forming an activated band body portion;
• producing said activated band body portion on a surface of said annular band body, making a rough profile;
• making said rough profile with at least one channel delimited by at least one pair of projections;
• extending said at least one channel along a path, which at least partially surrounds a rotation axis (X-X);
• making said at least one channel so that a cross section thereof at a longitudinal extension thereof comprises a channel body and two opposite channel sides, namely a first channel side forming an acute angle with said channel bottom, that is an angle smaller than 90°;
• a second channel side forming an obtuse angle with said channel bottom, that is an angle larger than 90°;
• and
• depositing, on said activated band body portion, at least one protective coating comprising at least one material with elevated resistance to abrasion,
• further comprising:
• nitro carburizing said activated band body portion, obtaining a nitro carburized surface layer on the surface of said activated band body portion;
• depositing, on said nitro carburized surface layer, a material, in particle form, made up of:
• chromium carbide (Cr3C2) and Nickel-Chrome (NiCr),
• or
• Nickel-Chrome (NiCr), Iron (Fe), Molybdenum (Mo), Cobalt (Co), Manganese (Mn) and Aluminum (Al),
• using spraying deposition techniques, preferably HVOF (High Velocity Oxygen Fuel) technique, HVAF (High Velocity Air Fuel) technique or KM (Kinetic Metallization) technique, forming a protective base coating, which covers the surface of said activated band body portion with interposition of said nitro carburized surface layer;
• and
• depositing, on said protective base coating, a material, in particle form, made up of tungsten carbide (WC), iron (Fe), chrome (Cr) and aluminum (Al), using spraying deposition techniques, preferably HVOF (High Velocity Oxygen Fuel) technique, HVAF (High Velocity Air Fuel) technique or KM (Kinetic Metallization) technique, forming a protective surface coating made up of tungsten carbide (WC) and iron (Fe), chrome (Cr) and aluminum (Al) and covering the surface of said activated band body portion.

A braking band of a disk for a disk brake, said braking band comprising an annular band body arranged around a rotation axis (X-X), said annular band body being made of one of gray cast iron, steel, aluminum or alloys thereof,

• said braking band further comprising at least one braking surface,
• wherein, at least one portion of said at least one braking surface comprises an activated band body portion for increasing adhesive capacity of at least one protective surface coating placed on a surface of said activated band body portion,
• wherein said at least one protective surface coating comprises at least one material with elevated resistance to abrasion,
• wherein said activated band body portion is arranged on a surface of said annular band body to form an outermost layer of the braking band with said at least one protective surface coating,
• and wherein said activated band body portion comprises a rough profile,
• said rough profile comprising at least one channel delimited by at least one pair of projections,
• said at least one channel extending along a path that at least partially surrounds said rotation axis (X-X),
• and wherein said at least one channel has a channel bottom, and two opposite channel sides in cross section, at a longitudinal extension thereof, namely
• a first channel side forming an acute angle with said channel bottom, that is an angle smaller than 90°, and
• a second channel side forming an obtuse angle with said channel bottom, that is an angle larger than 90°, wherein
• at least one of said pairs of projections comprises a projection with two channel sides, both forming obtuse angles with respective channel bottoms.

A braking band of a disk for a disk brake, said braking band comprising an annular band body arranged around a rotation axis (X-X), said annular band body being made of one of gray cast iron, steel, aluminum or alloys thereof,

• said braking band further comprising at least one braking surface,
• wherein, at least one portion of said at least one braking surface comprises an activated band body portion for increasing adhesive capacity of at least one protective surface coating placed on a surface of said activated band body portion,
• wherein said at least one protective surface coating comprises at least one material with elevated resistance to abrasion,
• wherein said activated band body portion is arranged on a surface of said annular band body to form an outermost layer of the braking band with said at least one protective surface coating,
• and wherein said activated band body portion comprises a rough profile,
• said rough profile comprising a plurality of channels and a plurality of pairs of projections,
• wherein said plurality of channels comprise individual channels and said plurality of pairs of projections comprise of individual projections,
• wherein said individual channels are each separated by an individual projection,
• wherein said plurality of channels extends along a path that at least partially surrounds said rotation axis (X-X),
• and wherein all of said plurality of channels have a channel bottom, and two opposite channel sides in cross section, at a longitudinal extension thereof, namely
• a first channel side forming an acute angle with said channel bottom, that is an angle smaller than 90°, and
• a second channel side forming an obtuse angle with said channel bottom, that is an angle larger than 90°,
• wherein each individual projection comprises a projection ridge, one first channel side, and one second channel side,
• wherein all projection ridges are parallel to all channel bottoms,
• wherein all first channel sides are parallel to all other first channel sides,
• wherein all second channel sides are parallel to all other second channel sides, and
• wherein all first channel sides are parallel to all second channel sides.