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AssigneeBrembo S.p.A.
InventorsFABIANO CARMINATI, SIMONE BIONDO, ALESSANDRO MANCINI, FEDERICO BERTASI
Estimating the term…
A method for making a brake disc may include the following steps: a) preparing a brake disc having a braking band provided with two opposite braking surfaces, (b) subjecting at least one of the braking surfaces to a working process adapted to increase the surface roughness thereof; c) nitrocarburizing the braking surface with increased surface roughness to obtain on the surface a nitrocarburized surface layer; (d) depositing on the nitrocarburized surface layer a material in particle form having: —Cr3C2 and NiCr, or —NiCr, Fe, Mo, Co, Mn and Al, which forms a base protective coating; and e) depositing on the base protective coating a material in particle form consisting of WC, Fe, Cr and Al, thus forming a surface protective coating of WC and Fe, Cr and Al.
1-22. (canceled)
A method for making a brake disc comprising the following operating steps:
A brake disc for a disc brake, comprising a braking band, provided with two opposite braking surfaces, each of which defines at least partially one of the two main faces of the disc, the braking band consisting of a base metal selected from grey cast iron or steel, wherein said brake disc is provided with:
The brake disc according to claim 14, wherein said rough profile is defined by a plurality of protuberances that extend orthogonally to said surface with a height between 30 and 200 μm and are spaced apart from each other—in a radial or circumferential direction with respect to the center of the braking band—with a pitch between 300 and 2000 μm, preferably said protuberances having an undercut angle with respect to the direction orthogonal to the surface from which they extend, preferably said undercut angle being between 2° and 15°.
The brake disc according to claim 14, wherein said nitrocarburized layer is obtained by a ferritic nitrocarburization treatment of the base metal.
The brake disc according to claim 14, wherein said nitrocarburized layer has a depth between 2 and 30 μm and hardness values higher than 300 HV in microhardness.
The brake disc according to claim 14, wherein said nitrocarburized layer comprises an oxidized top layer comprising magnetite (Fe3O4) acting as an interface with said base protective layer, preferably said oxidized top layer comprising magnetite (Fe3O4) having a thickness between 2 and 10 μm.
The brake disc according to claim 14, wherein the base protective coating consists of:
The brake disc according to claim 14, wherein the surface protective coating consists of 75% to 87% by weight of tungsten carbide (WC) and the remainder of iron (Fe), chromium (Cr) and aluminum (Al), and preferably of 85% by weight of tungsten carbide (WC) and of 15% by weight of iron (Fe), chromium (Cr) and aluminum (Al).
The brake disc according to claim 14, wherein the base protective coating has a thickness between 20 μm and 80 μm, and preferably 50 μm, said thickness referring to a coating portion above said rough profile.
The brake disc according to claim 14, wherein the surface protective coating has a thickness between 20 μm and 90 μm, and preferably equal to 60 μm, said thickness referring to a coating portion above said rough profile.
Dependencies are inferred from the claim text.