A method of making a wet friction material includes coating a first outer surface of a cellulose layer with a friction coating; placing a matrix of fibers and filler particles on a second outer surface of the cellulose layer; and saturating the matrix of fibers and filler particles with a binder and curing the binder to join the matrix of fibers and filler particles together to form a wet friction material base layer and to join wet friction material base layer to the second outer surface of the cellulose layer.

Expanded graphite and/or vermiculite are introduced into the friction lining mixture to eliminate or substantially reduce the amount of binder present therein. The friction lining at most contains from 2.5% by weight of binder. By omitting/reducing binder, the production is very stable and the friction linings can be easily reproduced. The process steps of hardening (including the hardening furnace) and scorching (including the necessary equipment) can be omitted when making such friction linings.

A braking band having an annular band body arranged around a rotation axis and made of one of gray cast iron, steel, aluminum or alloys thereof, has at least one braking surface having an activated band body portion for increasing adhesive capacity of at least one protective surface coating placed on the surface of the activated band body portion and having at least one material with elevated resistance to abrasion. The activated band body portion is arranged on the surface of the annular band body to form an outermost layer of the braking band with the at least one protective surface coating and has a rough profile having at least one channel delimited by at least one pair of projections, extending along a path at least partially surrounding the rotation axis and having a channel bottom and a first channel side forming an acute angle with the channel bottom and an opposite second channel side forming an obtuse angle with the channel bottom.

A brake friction member includes a friction base material and a transfer film material. The friction base material is stacked on a back plate. The transfer film material is stacked on the friction base material and faces an opposing member. The transfer film material is made of a composition obtained by mixing an organic filler in an ultralow melting point resin component.

A dual-layered graphene-based friction material is a paper matrix that is used as a high friction engagement lining in applications such as clutch plate or wet brake plate linings. The material uses a porous yet elastic fibrous base layer and a top layer containing thermally conductive graphene nanoplatelets mixed with a thermosetting resin. The top layer increases the overall thermal capacity while maintaining sufficient material porosity that allows satisfactory cooling oil flow through the material.

A method of making a wet friction material layer includes saturating a base layer with a binder. The base layer includes fibers and filler particles and includes a coating layer on an outer surface of the base layer. The coating layer plugs first pores of a first subset of the filler particles and prevents the binder from entering the first pores. The method also includes melting the coating layer to unplug the first pores.

A brake disc includes at least one friction surface consisting of a base body. The base body can be made from gray cast iron. At least one coating is applied on at least parts of the friction surface. The coating contains at least tungsten chromium carbide 2C and nickel-chromium NiCr. The coating may further contain tungsten carbide WC. The production of the brake disc according to the disclosure is also described herein. The coating has excellent oxidation resistance and good wear resistance even at high temperatures of up to 800 C.

A method for forming an oxidation protection system on a carbon-carbon composite structure can comprise applying a boron slurry to the carbon-carbon composite structure, wherein the boron slurry comprises a boron compound, a first glass mixture, a first glass former, a first glass modifier, and a first carrier fluid, the first glass mixture including a first glass compound and a second glass compound, the first glass compound having a first viscosity-temperature profile that is at least one order of magnitude below a second viscosity-temperature profile of the second glass compound; applying a silicon slurry to the carbon-carbon composite structure, wherein the silicon slurry comprises a silicon compound, a third glass compound, a second glass former, a second glass modifier, and a second carrier fluid; and heating the carbon-carbon composite structure.