Properties of CNTs/MoSi₂ composites prepared by spark plasma sintering

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• 作者：Yong Zhang 张勇 ; Hou-an Zhang 张厚安 ; He-jian Wu 吴和尖…
• 关键词：Key wordsCNTs/MoSi2 composite ; spark plasma sintering ; mechanical property ; microstructure ; strengthening and toughening mechanism
• 刊名：Journal of Central South University
• 出版年：2016
• 出版时间：December 2016
• 年：2016
• 卷：23
• 期：12
• 页码：3060-3064
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Engineering, general; Metallic Materials;
• 出版者：Central South University
• ISSN：2227-5223
• 卷排序：23

文摘

Molybdenum disilicide (MoSi₂) based composites with various contents of carbon nanotubes (CNTs) were fabricated by spark plasma sintering (SPS) in vacuum under a pressure of 25 MPa. The composites obtained under a sintering temperature of 1500 °C and time of 10 min exhibited optimum mechanical properties at room temperature in terms of fracture toughness and transverse rupture strength. MoSi₂ based composite with 6.0% CNTs (volume fraction) had the highest fracture toughness, transverse rupture strength and hardness, which were improved by about 25.7%, 51.5% and 24.4% respectively, as compared with pure MoSi₂. A Mo_4.8Si₃C_0.6 phase was detected in CNTs/MoSi₂ composites by both X-ray diffraction (XRD) method and microstructure analysis with scanning electron microscopy (SEM). It is believed that the fine grains and well dispersed small Mo_4.8Si₃C_0.6 particles had led to a higher hardness and strength of CNTs/MoSi₂ composites because of their particle pullout, crack deflection and micro-bridging effects.