Электропроводный материал на основе порошковой меди с повышенными механическими свойствами

Abstract

The methods of pressing, rolling, and sintering in hydrogen at 800°C have been applied to production of powdered materials based on copper of the Cu–Fe–Al system. The influence of single components and their blends on compaction, structure, and main functional properties of composite materials—electrical conductivity, hardness, and strength (yield stress)—has been analyzed as a function of process variables: compacting pressure of 200–700 MPa, deformation by rolling of 40–85%, dispersity of iron powders having particle sizes <50 and 63–100 μm, contents of iron powder of 5–10 wt % and Fe2Al5 intermetallic powder of 2.5–5 wt %. The best combination of physicomechanical properties has been found for composite material with the composition (wt %) 92.5 Cu + 2.5 Fe2Al5 + 5 Fe, together with iron particle sizes of 63–100 μm. It has been demonstrated that dispersion strengthening of copper by Fe2Al5 particles and filling of its structure with iron fibers formed by rolling provides high relative density of 98–99% and subsequent strength properties of the composite material: hardness HB of 980 MPa, yield stress of 150 MPa at electrical conductivity of 71% of copper conductivity.