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首页> 外文期刊>Materials Science and Engineering >Carbon nanotube and in-situ titanium carbide reinforced titanium diboride matrix composites synthesized by reactive spark plasma sintering
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Carbon nanotube and in-situ titanium carbide reinforced titanium diboride matrix composites synthesized by reactive spark plasma sintering

机译：反应火花等离子体烧结合成碳纳米管和原位碳化钛增强二硼化钛基复合材料

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摘要

Mechanically milled powder mixtures of Titanium and Boron containing 1, 2,4 and 6 vol% multi-walled carbon nanotubes (CNT) were consolidated by reactive spark plasma sintering resulting in TiB_2-TiC-CNT hybrid composites. Addition of CNT was found to affect the reaction rate for TiB_2 formation which results in sudden volume shrinkage. Rod shaped TiC were formed due to reaction between Ti and CNT. TiB_2-TiC-CNT hybrid composites having more than 96% relative density with nanosized TiB_2 grains were obtained. XRD results revealed TiB_2 and TiC as major and minor phases respectively. Unreacted CNT were observed in SEM and TEM. TiB_2-TiC-CNT composites showed nanohardness of above 25 GPa and elastic modulus of 520 GPa. Indentation fracture toughness was improved by 55% (3.3 ± 0.1 to 5.11 ± 0.6) by the addition of 4 vol% of CNT. The effect of CNT addition on oxidation and co-efficient of thermal expansion is also presented.
机译：通过反应性火花等离子体烧结将含有1、2、4和6％（体积）的多壁碳纳米管（CNT）的机械研磨的钛和硼粉末混合物固结，得到TiB_2-TiC-CNT杂化复合材料。发现添加CNT会影响TiB_2形成的反应速率，从而导致体积突然收缩。由于Ti和CNT之间的反应，形成了棒状的TiC。获得了相对密度大于96％的纳米TiB_2晶粒的TiB_2-TiC-CNT杂化复合材料。 XRD结果表明TiB_2和TiC分别为主相和次相。在SEM和TEM中观察到未反应的CNT。 TiB_2-TiC-CNT复合材料的纳米硬度高于25 GPa，弹性模量为520 GPa。通过添加4％（体积）的CNT，压痕断裂韧性提高了55％（3.3±0.1至5.11±0.6）。还介绍了碳纳米管添加对氧化和热膨胀系数的影响。

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