Effects of SPS Pulse Current on Interface of Al₉₀Mn₉Ce₁/ZrO₂ Micro-Cellular Structure Composites

Abstract:

Metal/ceramic composite materials with micro-cellular structure which is Al₉₀Mn₉Ce₁ micron powders coated by 10 wt% ZrO₂ nanosized 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 Al₉₀Mn₉Ce₁/ZrO₂ composites are sintered by a large pulse current, the hot focus on ZrO₂ nanopowder among Al₉₀Mn₉Ce₁ alloy particles as well as Al₉₀Mn₉Ce₁ 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 Al₉₀Mn₉Ce₁ alloy cell body and the ZrO₂ nanosintered cell wall, so as to achieve good sintering.

• Periodical: Materials Science Forum (Volume 749)
• Pages: 61-66
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.749.61
• Online since: March 2013
• Authors: Zhao Zan, Ming Gang Wang, Zhan Kui Zhao
• Keywords: Al₉₀Mn₉Ce₁/ZrO₂, Diffusion, Interface, Pulse Current, Sintering Mechanism, Spark Plasma Sintering (SPS)

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