Study On High Strength And Electric Conductivity Copper Alloy Prepared By Nano-Carbon Fiber Composite And Rapidly Solidification Methods

In order to get high strength and high electric conductivity copper alloys, two preparing methods were studied in this paper: nano-carbon fiber reinforced copper composite and rapidly solidification Cu-Cr-RE alloys..C/Cu composite: A new method was proposed to prepare short nano-carbon fiber reinforced copper composites. The method was called as laminated direct press-casting. The effects of styie and shape of crucible, temporature and pressure on the C/Cu composites were investigated. The results showed that good samples could be got under suitable temperature and pressure, which were 1100C and 0.3×10⁵Pa. In those good samples almost all of carbon fibers were infiltrated into copper matrix with good adhesion. Their hardness was 30 % higher than those samples without carbon. And a new phenomenon that trace sulphur aggregated to form particles with good round-face was observed. The particles were made up of Cu₂S according to the results analyzed by X-ray Diffraction.Rapidly solidification Cu-Cr-RE alloy: the microstructure and hardness of Cu-Cr, Cu-Cr-RE and Cu-RK alloys in were studied. The results showed that the growth of partial columnar grain was suppressed and the hardness was elevated by rare earth elements (La-Ce) in rapidly quenched condition. Daring aging, precipitation the second Cr particles was suppressed, so the mechanics property of Cu-Cr alloy for elevated-temperature application is improved. And eutectic structure in Cu-Cr alloy is charged from Club-shaped, eutectic structure and Laminar eutectic structure to Reticulate eutecticstructure by rare eanh elements.