Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 622, Issue -, Pages 458-462Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2014.10.066
Keywords
Spark plasma sintering (SPS); Al/SiCN composites; Hardness; Microstructure
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The powder mixtures of aluminum and silicon carbonitride (Al-SiCN) have been consolidated into bulk materials by spark plasma sintering. XRD patterns indicated the in-situ formation of SiC and AlN. The density of the SiCN-Al composite sintered by SPS at 500 degrees C is 2.65 g/cm(3) or higher in a weight range of SiCN powder particles up to 2.5%. The formation of new phases and the relatively absence of porosities in the matrix composites are attributed to the co-existence of solid-liquid state that leads to the effective densification of the mixed powders. The breakdown of SiCN network structure was considered to result from a reaction between partially aluminum melt and SiCN particles. An improvement in density and hardness is observed. (C) 2014 Elsevier B.V. All rights reserved.
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