Effects of processing conditions on microstructure, electrical conductivity and mechanical properties of MWCNT/alumina composites prepared by flocculation
Effects of processing conditions on microstructure, electrical conductivity and mechanical properties of MWCNT/alumina composites prepared by flocculation
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DOI：
10.1016/j.jeurceramsoc.2015.06.027
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发表时间：
2015-11
影响因子：
5.7
通讯作者：
Weili Wang;G. Yamamoto;K. Shirasu;Y. Nozaka;T. Hashida
中科院分区：
文献类型：
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作者：
Weili Wang;G. Yamamoto;K. Shirasu;Y. Nozaka;T. Hashida
采用絮凝法结合酸处理和放电等离子烧结制备了MWCNT/Al 2 O3复合材料。改变加工条件，即酸处理温度（50-80 °C）、MWCNT含量（0-10体积%）和烧结温度（1200-1600 °C）对复合材料的显微结构、导电性和力学性能的影响。结果表明，絮凝处理对MWCNTs有很好的分散作用，特别是在较高的酸处理温度下，增强了MWCNTs的增强和晶粒细化效果。因此，使用1200 °C的烧结温度和80 °C的酸处理温度制备的复合材料表现出比单块氧化铝更大的断裂韧性，即使MWCNT含量高达10体积%。
MWCNT/alumina composites were prepared by a flocculation method combined with acid treatment of the MWCNTs and spark plasma sintering. The effects of varying the processing conditions, namely the acid treatment temperature (50–80 °C), MWCNT content (0–10 vol.%) and sintering temperature (1200–1600 °C) on the composites’ microstructure, electrical conductivity and mechanical properties were investigated. This found that flocculation processing brings about a good dispersibility of the MWCNTs, especially with higher acid treatment temperature, which enhances their reinforcing and grain refining effect. When combined with a low sintering temperature, this significantly improves the mechanical properties of the composites.As a result, a composite prepared using a sintering temperature of 1200 °C and an acid treatment temperature of 80 °C exhibited a fracture toughness greater than that of a monolithic alumina, even with a MWCNT content as high as 10 vol.%.