Spark plasma sintered silicon carbide ceramics with nanostructured ferritic alloy as sintering aid

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• 作者：Zhihao Hu ; Kaijie Ning ; Kathy Lu ; ^klu@vt.edu
• 关键词：Composites ; Sintering ; Fracture ; Microanalysis ; Mechanical characterization
• 刊名：Materials Science and Engineering: A
• 出版年：2017
• 出版时间：13 January 2017
• 年：2017
• 卷：682
• 期：Complete
• 页码：586-592
• 全文大小：1886 K
• 卷排序：682

文摘

Nanostructured ferritic alloy-silicon carbide composites (NFA-SiC) were sintered at 1950–2100 °C by spark plasma sintering (SPS). The influence of NFA addition on the sintered NFA-SiC composites has been investigated based on densification, phase, microstructure, and mechanical property. Addition of 2.5 vol% NFA can lead to full densification for the NFA-SiC composites even though it also introduces secondary carbon-rich and iron-rich phases. With the increase of the sintering temperature, the Vickers hardness for the pure SiC and NFA-SiC composite samples is enhanced. However, the NFA-SiC composites have lower hardness than the pure SiC samples. The flexural strength for the pure SiC is also higher than that of the NFA-SiC composites. Nanohardness results demonstrate that the reaction products between SiC and NFA lower the mechanical properties of the NFA-SiC samples.