Designing of Laminated Structure of Antifriction Powder Composite

摘要

A new high-density copper-based powder antifriction composite with layered structure was developed and produced by rolling technique. Iron powder with intermetallic shell (Fe_2Al_5) is a reinforcing component of the antifriction composite. The reinforcing component was produced by thermal-vibrational treatment of iron and aluminium powders mixture in a cladding unit. Complex reinforcing of copper matrix occurs in the result of rolling, namely, iron core is deformed plastically and forms reinforcing fibers, but fragile intermetallic shells are crushed in to pieces with size of 1 μm or less. The fine particles are distributed in the copper matrix uniformly. Additives of plumbum powder as solid lubricant are stretched in thin plates. The hardness and friction moment of 80Cu-5Fe_2Al_5-5Fe-10 Pb (wt.%) antifriction composite were 980 MPa and 0.4, respectively. These values are in compliance with state of the art requirements for bearing shells used in automotive industry.