Friction materials containing spinel solid solution as friction modifier

Abstract From the Canadian patent

Friction material adapted for use for example, as a, brake lining is disclosed. The material is comprised of a rigid, thermosetting, heat-resistant organic resin rein-, forcing fibers if desired, and in particulate form a crystalline mineral friction modifier of an isomorphous substittutional solid solution consisting essentially of atoms of metals and oxygen arranged as a mixed crystal in a normal spinel crystal lattice structure. There are at least two different metal atoms present in the crystal lattice the, total number of metal atoms having a total valence charge sufficient to maintain electrical neutrality. The friction material may be conventionally supported as by a shoe or disc.