Effects of SPS Pulse Current on Interface of Al_(90)Mn_9Ce_1/ZrO_2 Micro-cellular Structure Composites

摘要

Metal/ceramic composite materials with micro-cellular structure which is Al_(90)Mn_9Ce_1 micron powders coated by 10 wt% ZrO_2 nano-sized powder is prepared by spark plasma sintering. Effects of the SPS pulse current on the sintering behavior and the composite interface structure is investigated via SEM, XRD, TEM and EDS. The experimental results show that the pulse current is the key factor to the formation of micro-cellular structure. When the Al_(90)Mn_9Ce_1/ZrO_2 composites are sintered by a large pulse current, the hot focus on ZrO_2 nano-powder among Al_(90)Mn_9Ce_1 alloy particles as well as Al_(90)Mn_9Ce_1 alloy particle surface, because of the effect of spark plasma and the concentration of the skin effect in short-term. Dividing temperature field on the interface of micro-cellular structure is benefit for the local high-temperature sintering of the ceramic cell walls layer, and also for the diffusion and interfacial bonding between Al_(90)Mn_9Ce_1 alloy cell body and the ZrO_2 nano-sintered cell wall, so as to achieve good sintering.