A method for manufacturing a ferrous rotational member including the steps of turning a first portion of the friction surface at a sufficient feed rate to provide a first deformed layer on the first portion of the friction surface; fine turning a second portion of the friction surface at a sufficient feed rate to provide a second deformed layer on the second portion of the friction surface; burnishing the first and second portions of the friction surface to achieve a predetermined roughness; and nitrocarburizing the rotational member at a time and temperature sufficient for the diffusion of nitrogen atoms and carbon atoms through the deformed layer to form hardened casings having variable thickness. The ferrous rotational member may be that of a brake rotor having a hub surface and a friction surface, where the hub surface and friction surface have a variable thickness hardened casing.

A bicycle disc brake rotor is provided with a base rotor plate and a surface region. The base rotor plate includes an outer portion that is formed of iron. The outer portion has first and second base surfaces facing in opposite axial directions. The surface region is formed by a diffusion process on the base rotor plate. The surface region has a corrosion resistant characteristic which is superior to the base rotor plate.

A bicycle disc brake rotor, having a rotational center axis, comprises an outer portion having plural layers including first and second braking surfaces in opposite axial directions. The plural layers include a first layer made of a copper or a copper alloy.

A brake drum having a composite structure includes a cylindrical body defining an inner friction surface and an outer surface. The cylindrical body includes a drum core comprising an AlSi alloy, the drum core including an inner surface, and an outer surface of the drum core defining the outer surface of cylindrical body. The cylindrical body includes a thermal barrier layer comprising a thermally insulating material on the inner surface of the drum core, and a wear-resistant layer comprising an FeAlSiZr alloy on the inner surface of the drum core over the thermal barrier layer, the wear-resistant layer defining the inner friction surface of the cylindrical body.

A number of variations may include a ferritically nitrocarburized vehicle component comprising a compound zone and a friction surface at an outer edge of the compound zone wherein the friction surface is configured for engagement with a corresponding friction material, and wherein the compound zone comprises a nitride layer comprising epsilion iron nitride, Fe.sub.3N and gamma prime iron nitride Fe.sub.4N.

A disc for a disc brake for automotive use comprises a hat provided with a plurality of hat seats, a braking band provided with a plurality of band seats, and a lug connection system.

A brake disk for a disk brake, which consists of a brake disk chamber and at least one friction ring connected to the brake disk chamber by rivets, wherein a jacket of the brake disk chamber is provided with sections having reduced wall thickness and/or through-holes, which are axially directed material cut-outs located on the outer periphery of the brake disk chamber jacket, which material cut-outs are used to at least partially place the axially directed rivets. The friction ring and the brake disk chamber are centered with respect to each other exclusively by the rivets. The friction ring has at least one fastening extension directed inward from the friction surface, to which fastening extension a collar of the brake disk chamber jacket is connected by the rivets in that the side of the friction ring directed toward the brake disk chamber has an axially directed depression for accommodating the collar of the brake disk chamber, which depression is designed in such a way that there is radial play between the brake disk chamber and the friction ring.

A brake disc for a disc brake includes a brake disc hub and at least one friction ring which is connected to the brake disc hub via rivets, a jacket of the brake disc hub being provided with sections with a reduced wall thickness and/or apertures which are axially directed material cut-outs situated on the outer circumference of the brake disc hub jacket and serve for at least partial positioning of the axially directed rivets. The friction ring and the brake disc hub are centered with respect to one another exclusively via the rivets, and each rivet, before the deformation thereof, is configured so as to taper conically at least over a part region of the rivet shank thereof in the region of the brake disc hub, starting from a swage head to a rivet closing head.

An internally ventilated brake disk for a disk brake, includes two friction disks, which are arranged adjacent to each other and which are connected to each other by radially extending, regularly arranged webs. The webs extend from an outer peripheral edge to an inner peripheral edge of the friction disks and the friction disks are connected by the webs in such a way that intermediate spaces thereof form cooling channels of equal size, through which cooling air can flow and which are divided by further, shorter webs in such a way that at least one shorter web is located centrally between the webs in a radial region closer to the inner peripheral edge of the friction disks. Outward from the shorter web in the radial direction, the cooling channels are divided into at least three flow channels in that, in each cooling channel, two first further shorter webs are arranged at an offset to each shorter web radially outwardly and in the peripheral direction. The friction disk directed toward a brake disk hub is extended radially inward from each of the shorter webs and is provided with a bore in the axial direction at the height of a collar of the brake disk hub, which bore is used to hold a rivet, which fastens the friction disk to the brake disk hub.

A method of manufacturing a corrosion- and wear-resistant component and a corrosion- and wear-resistant component. The method includes preparing a feedstock powder that includes a stainless steel powder and a ceramic powder, sintering the feedstock powder at a first temperature to form a low porosity free-standing wear body, and bonding the wear body to an aluminum or aluminum alloy substrate at a second temperature lower than the first temperature.