SiCp/Cu composites prepared by the dual-directional extrusion process of floating die
SiCp/Cu composites were fabricated by the dual-directional extrusion process of the floating die. The microstructure, wear behavior and conductivity of SiCp/Cu composites were studied by optical microscope, abrasion test and current conductivity instrument. The results show that the SiCp/Cu composites with SiC particle distributed uniformly can be obtained, and the conductivity of composites decreased with the increasing of concentration of SiC particles, the wear resistance behavior of SiCp/Cu composites is evidently better than Cu with the increasing of concentration of SiC particles, the wearing mechanism of composites is a synthetically combined function of micro-cutting wearing and surface peeling off and grain wearing.
Tribological behaviour of SiC particle-reinforced copper matrix composites
Abstract Pure copper and its composites reinforced with SiC particles were prepared by hot isostatic pressing (HIP) process. The tribological behaviour of copper and composites was studied on a pin-on-disc tester. The pins were slid against a hardened steel disc under dry ambient conditions. In two-body abrasive wear measurements, the disc surface was bonded with a SiC abrasive paper of 240 grit size. The abrasive wear measurements showed that soft copper exhibits an extremely high wear loss. However, additions of SiC particles up to 20 vol.% appeared to improve the abrasive wear resistance of copper significantly under the applied loads of 15–55 N. Dry sliding wear tests also indicated that the composite with 20 vol.% SiC exhibits a lower wear loss compared to pure copper. This was due to the reinforcing SiC particles being effective to reduce the extent of wear deformation in the subsurface region during sliding.
P/M in Taiwan R.O.C.
In this status report on powder metallurgy (P/M) in Taiwan, we focus on structural parts. Since 1978 the P/M industry in Taiwan has grown at an annual rate in excess of 15%. Due to the strong demand for P/M structural parts by the transpartation, industrial machinery, electrical machinery, and related industries. Warm compaction is now used in the production of high strength P/M parts for electric power tools, and metal injection molding is a high value-added production process. Both processes will assume important roles in the P/M industry in Taiwan in the future. Since its establishment in 1981, the Powder Metallurgy Association of the Republic of China (PMA/R.O.C.) has grown rapidly. Government and industry promote R & D programs which result in new P/M technology and business.