Antifriction powder bronzes with mechanically alloyed copper-based granules

Abstract

New antifriction composite materials of matrix-filled type based on tin bronze powder for heavily loaded elements of friction units are presented. As their load-bearing structural component heat - and wear-resistant fillers in the form of copper-based granules with the initial composition Cu-5% Al-2% C-2% MoS2 are used, obtained in the course of the reactionary mechanical alloying of copper powder in the air of attritor by aluminum and lubricating additives in the form of graphite and molybdenum disulfide. Dynamically thermostable particles in the form of γ-Al2O3 oxides of nanodispersed level, mechanochemically synthesized in the attritor, are evenly distributed in copper-based cold-hardened granules and provide them with a high temperature of softening - up to 08...0.9 of the melting temperature of copper. The addition of such granules to powder bronze with 5 wt% tin allowed to obtain antifriction composite materials, which in terms of mechanical and tribotechnical properties significantly exceed the standard antifriction tin and aluminum bronzes and, in particular, bronze EN CuSn8 and EN CuAl10Ni5Fe4.