Preparation And Characterization Of Powder Sintering Fe-Cu Multicomponent Alloys

Iron alloy has excellent mechanical properties, but poor electrical conductivity. Compared with iron alloy, copper alloy has good electrical conductivity, but has poor mechanical properties. Fe-Cu multi alloy is both good mechanical and electrical properties.In this paper, Fe-Cu alloy was prepared by powder metallurgy sintering technique. Gd2O3 particle reinforced Cu matrix composite powders were prepared by the internal oxidation process. Then the mass fraction of 30% Cu based composite powders and mass fractions of 70% were tailored for the pre alloyed iron powder mixed evenly. After mixed, the mixed powder is reduced to the tube type reducing furnace, and the reduced powder was filled into the graphite mold. Sintering tests carried out in the vacuum sintering furnace. After sintered the sintered samples were quenched and tempered to obtain an Fe-Cu alloy with excellent comprehensive properties and high electrical conductivity. Study of high-speed carrier friction and wear properties of Fe-Cu multicomponent alloys.The optimized sintering process was: Sintering temperature 1070 oC, holding time 30 min, sintering pressure 30 MPa. Optimization of the quenching and tempering process was 880 oC quenching, heat 30 min, 620 oC tempering, heat 1h.The results show that the microstructure of the tempered bainite was obtained after quenching and tempering treatment. Dispersed uniformly distributed Cr7C3, MoC, Fe3 C particles equiaxed ferrite matrix, played a good role in strengthening. Gd2O3 internal oxidation generated fine particles, size between 50~100nm, distributed evenly dispersed in the copper matrix. In good interfacial bonding between Cu-Gd2O3. Fe-Cu alloy prepared by this process, the plastic toughness was well matched. Its tensile strength reached 840 MPa, the elongation reached 9.2%. Good conductive properties, conductivity rate reached 15% IACS. It exhibited good overall performance.In the process of friction and wear, the sliding velocity increases from 60m/s to 140m/s. With the increase of sliding speed, the friction coefficient decrease and the wear rate increase. After loading the 20 A current, compared with no load current, the arc erosion affected, friction coefficient, wear rate increased. With the increase of sliding speed, the wear mechanism of the wear mechanism tranformed from abrasive wear to adhesive wear. After loading 20 A current, the wear mechanism was more complex, abrasive wear, adhesive interaction more wear mechanisms of wear and arc ablation.