Densifying Ti3AlC2/Cu Composites Using a Cold-Extruding and Temper Means
A cold-extruding and temper means was developed in order to densify the Ti3AlC2 toughened Cu matrix composites with a lower content of Ti3AlC2 ceramic. The Ti3AlC2/Cu samples, with 10%, 15% and 20% of Ti3AlC2 in volume ratio, ware prepared by pressless sintering a mixture of copper and Ti3AlC2 powders, after which were formed by the cold isostatic compaction. The sintered samples ware extruded at room temperature, and then tempered at 950oC. Such treatment was performed twice for obtaining a more remarkable densifying effect. Changes in microstructures were observed by SEM after every extrusion and temper. The results show that particle size of Ti3AlC2 was reduced more than 50% after secondary extrusion and temper, and the particles distribution became more uniform in compared with the untreated samples. As a result of the microstructural change, the densities of the Ti3AlC2/Cu samples were increased about 5 %, and defects such as pores and microcracks were almost entirely slaked.
Wei Pan and Jianghong Gong
H. B. Zhang et al., "Densifying Ti3AlC2/Cu Composites Using a Cold-Extruding and Temper Means", Advanced Materials Research, Vols. 105-106, pp. 87-89, 2010