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首页> 外文期刊>RSC Advances >Synthesis and characterization of low specific resistance alumina-clay–carbon composites by colloidal processing using sucrose as a soluble carbon source for electrical applications
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Synthesis and characterization of low specific resistance alumina-clay–carbon composites by colloidal processing using sucrose as a soluble carbon source for electrical applications

机译：用蔗糖作为电气应用的可溶性碳源的胶体加工对低特异性耐氧化铝 - 粘土 - 碳复合材料的合成与表征

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摘要

Switching resistors in high voltage circuit breakers require the use of materials with low specific resistance which can sustain high temperatures for short durations, have high thermal conductivity and thermal shock resistance. Materials that satisfy these requirements can be produced by dispersing a conducting phase such as carbon black, graphite, CNT, graphene in ceramic matrix. Dispersion of these ultrafine forms of carbon to obtain contiguity at lower volume fractions is a challenge. In this work, alumina-clay–carbon composites were fabricated by using alumina-clay slurries with addition of sucrose as a soluble carbon source. Sucrose is converted into conducting carbon with heat treatment at high temperatures. Alumina-clay–carbon composites made using a soluble source (sucrose) sintered at 1400 °C showed resistor behaviour even at carbon contents less than 1 wt% produced by graphitization of sucrose at high temperature. Raman spectroscopic scans over a wide area of the samples confirmed uniform distribution of carbon within the ceramic matrix. Resistivity of the alumina-clay–carbon composites varied between 30 ohm cm to 2 ohm cm for sucrose additions (equivalent to carbon content) of 2–9 wt%. The resistivity of the composite samples produced with the use of sucrose was significantly lower than that of samples produced by dispersing carbon black as the conducting phase.
机译：高压断路器中的开关电阻需要使用具有低特异性电阻的材料，该材料可以维持短持续时间的高温，具有高导热性和热抗震性。满足这些要求的材料可以通过分散陶瓷基质中的导电相，如炭黑，石墨，CNT，石墨烯，石墨烯。这些超细形式的碳的分散在较低体积分数下获得邻接是挑战。在这项工作中，通过使用氧化铝 - 粘土浆料加入蔗糖作为可溶性碳源来制造氧化铝 - 粘土 - 碳复合材料。在高温下将蔗糖转化成导电碳，热处理。使用在1400℃下烧结的可溶性源（蔗糖）制备的氧化铝 - 粘土 - 碳复合材料表明，即使在高温下的蔗糖石墨化产生的碳含量小于1wt％的碳含量，也显示出电阻器行为。拉曼光谱扫描在样品的宽面积上证实了陶瓷基质内碳的均匀分布。氧化铝 - 碳复合材料的电阻率在30℃至2欧姆厘米之间变化，蔗糖添加（相当于碳含量）为2-9wt％。使用蔗糖产生的复合样品的电阻率显着低于通过将炭黑作为导电相分散的样品的电阻率。

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