Synthesis and Characterization of TiC Nanofibers Obtained via a Modified Carbothermal Process

IF 1.5 4区 材料科学 Q3 CRYSTALLOGRAPHY Crystal Research and Technology Pub Date : 2021-06-07 DOI:10.1002/crat.202000231
Chung‐Ying Tsai, K. Mondal
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Abstract

A simple method for synthesis of titanium carbide (TiC) nanofibers by a modified carbothermal reduction of electrospun titanium‐based fibers is reported. The effect of synthesis steps on the final product is discussed. Continuous TiC fibers synthesized have a smooth surface morphology, with average diameter of 148 nm and length in the centimeter range. X‐ray diffraction and high‐resolution transmission electron microscopy analysis results indicate that the fibers consist of TiC of high purity. Impact of heat treatment on the morphology and chemical and crystalline composition of the product is also investigated. Based on the experimental evidence, it is hypothesized that the carbothermal reduction of calcined electrospun fibers with precoated carbon proceeds through diffusion‐limited shrinking core pathway while that of the as‐spun fibers follows the reaction‐limited solution precipitation mechanism. The TiC nanofibers also show superior sintering properties by increasing theoretical density of hot pressed TiB2 from 94.5% of theoretical density to 97.9% of theoretical density. When sintered with ceria, it improves the conductivity of the ceria by 18.29 times as compared to 2.94 times by TiC nanoparticles at 800 °C. The TiC nanofibers show metallic behavior as well as potential for application as electrochemical double layer capacitor supercapacitors.
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改性碳热法制备TiC纳米纤维的合成与表征
报道了一种以电纺钛基纤维为原料,经碳热还原改性合成碳化钛纳米纤维的简单方法。讨论了合成步骤对最终产物的影响。合成的连续TiC纤维表面形貌光滑,平均直径为148 nm,长度在厘米范围内。X射线衍射和高分辨率透射电镜分析结果表明,纤维中含有高纯度的TiC。研究了热处理对产品形貌、化学成分和结晶组成的影响。基于实验证据,假设预包覆碳电纺纤维的碳热还原是通过扩散-限制缩芯途径进行的,而预包覆碳电纺纤维的碳热还原是通过反应-限制溶液沉淀机制进行的。热压TiB2的理论密度从理论密度的94.5%提高到理论密度的97.9%,TiC纳米纤维表现出优异的烧结性能。在800℃烧结时,与TiC纳米颗粒相比,其电导率提高了2.94倍,而与二氧化铈烧结时,其电导率提高了18.29倍。TiC纳米纤维具有良好的金属性能,具有作为电化学双层电容超级电容器的应用潜力。
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来源期刊
自引率
6.70%
发文量
121
审稿时长
1.9 months
期刊介绍: The journal Crystal Research and Technology is a pure online Journal (since 2012). Crystal Research and Technology is an international journal examining all aspects of research within experimental, industrial, and theoretical crystallography. The journal covers the relevant aspects of -crystal growth techniques and phenomena (including bulk growth, thin films) -modern crystalline materials (e.g. smart materials, nanocrystals, quasicrystals, liquid crystals) -industrial crystallisation -application of crystals in materials science, electronics, data storage, and optics -experimental, simulation and theoretical studies of the structural properties of crystals -crystallographic computing
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