... film to prevent sharp edges and corners.Bearing materials:1) metal materials, such as bearing alloy, bronze, aluminum alloys, ... powder material);3) non-metallic materials.Of which:Bearing alloys: white metal bearing alloy known, mainly tin, lead, antimony or other ... oil bearing, with self-lubricating properties. Toughness of porous metal materials is small, only suitable for stationary and non-impact ...