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首页> 外文期刊>RSC Advances >Preparation of Ti, Ti/TiC or Ti/TiN based hollow fibres with extremely low electrical resistivity
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Preparation of Ti, Ti/TiC or Ti/TiN based hollow fibres with extremely low electrical resistivity

机译：具有极低电阻率的Ti，Ti / TiC或Ti / TiN的中空纤维的制备

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Porous Ti based hollow fibres with extremely low electrical resistivity (4.1–9.6 μΩ m), orders of magnitude smaller than reported for Ti-fibres in the literature, were produced by dry-wet spinning of a mixture of Ti-particles, polyethersulfone (PES), and N -methylpyrrolidone (NMP). Utilizing a two-step thermal decomposition of PES, consisting of treatment in air at 475 °C, followed by treatment in argon at 800 °C, hollow fibres of entirely metallic Ti are obtained, as confirmed by XRD, SEM-EDS, and TGA-MS analyses. Only a thin oxide layer is formed due to ambient surface oxidation, as identified by XPS analysis. Carbonization of the polymer under an inert atmosphere can be used to produce a Ti/TiC-composite. To obtain a Ti/TiN composite, the porous Ti-tubes can be treated in nitrogen atmosphere at 800 °C. The porosity, pore size distribution, and bending-strength of the fibres were determined for a low (800 °C) and high (1100 °C) degree of sintering, and it was found that these are largely independent of the chemical surface composition. The presence of TiC or TiN, likely in an outer, but crystalline shell (based on XRD and XPS data), results in lower resistivity than of the pure Ti fibres, which can be attributed to the insulating layer of TiC or TiN preventing capacitive effects at the Ti/air interface. The developed preparation methodology results in porous metallic and composite Ti based fibres, which are very suitable for electrochemical applications.
机译：基于多孔Ti的中空纤维，具有极低的电阻率（4.1-9.6μΩm），小于文献中的Ti-Fibers的报道的数量级，通过干湿纺丝，所述Ti颗粒的混合物，聚醚砜（PES ）和N-甲基吡咯烷酮（NMP）。利用PE的两步热分解，由475°C的空气中的处理组成，然后在800℃下处理氩气，得到完全金属Ti的中空纤维，如XRD，SEM EDS和TGA所证实 - 分析。由于XPS分析鉴定，仅由于环境表面氧化而形成薄氧化物层。惰性气氛下聚合物的碳化可用于生产Ti / TiC复合材料。为了获得Ti /锡复合材料，多孔Ti管可以在800℃下在氮气氛中处理。纤维的孔隙率，孔径分布和弯曲强度用于低（800℃）和高（1100℃）的烧结度，发现这些主要与化学表面组合物无关。在外部但结晶壳（基于XRD和XPS数据）的情况下，TiC或TiN的存在导致纯Ti纤维的电阻率较低，这可能归因于TiC或TiN的绝缘层，防止电容效应在Ti /空中接口。开发的制备方法导致多孔金属和复合Ti的纤维，非常适合电化学应用。

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