| abstract |
A monolithic block of friction material comprises two adjacent layers formed from metallic powders and the matrices of the two layers comprise the same metal of a wear-resistant nature, for example iron or steel, the layer forming the friction lining including (i) less of this metal than the other layer forming the backing medium and (ii) a frictional and/or lubricating additive for example coke or graphite. The monolithic block is formed from the two layers of metallic powder by pressing at elevated pressure and sintering the resulting consolidated powder block. |