Light metal structure-function dual-gradient composite brake disc (brake drum)

A light metal composite material brake disc or brake drum, comprising:

• a composite friction layer, comprising a ceramic skeleton and a light metal that are bonded together, wherein the ceramic skeleton comprises a plurality of pores;
• and
• a light metal structural body integrally bonded with the composite friction layer and forming a mounting structure;
• wherein the ceramic skeleton has a bonding surface bonded to the light metal structural body, said bonding surface being substantially a slanted planar surface that is not parallel to a friction surface of the brake disc or drum, or a non-planar surface that is not parallel to the friction surface, the bonding surface exhibiting a gradient change along a radially outward direction of the light metal composite material brake disc or drum;
• wherein a pore diameter of each of the plurality of pores in the ceramic skeleton exhibits a gradient change along a direction from the friction surface toward the bonding surface of the ceramic skeleton;
• wherein the light metal infiltrates and substantially fills each of the plurality of pores within the ceramic skeleton thus forming a monolithic composite structure with the ceramic skeleton.