Abstract An understanding of the processing and microstructure of ceramic–carbon composites is critical to development of these composites for applications needing electrically conducting, thermal shock resistant ceramic materials. In the present study green compacts of carbon ceramic composites were prepared either by slurry processing or dry powder blending of one or more of the three — clay, glass, alumina and carbon black or graphite. The dried green compacts were sintered at 1400 °C in flowing argon. The ceramic carbon composites except the ones without clay addition showed formation of silica nanowires. The silica nanowire formation was observed in both samples prepared by slip casting and dry powder compaction containing either carbon black or graphite. TEM micrographs showed presence of carbon at the core of the silica nanowires indicating that carbon served the role of a catalyst. Selected area electron diffraction (SAED) suggested that the silica nanowires are amorphous. Prior studies have reported formation of silica nanowires from silicon, silica, silicon carbide but this is the first report ever on formation of silica nanowires from clay.

中文翻译：

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陶瓷碳复合材料中二氧化硅纳米线的原位生长

摘要 了解陶瓷-碳复合材料的加工和微观结构对于开发这些复合材料用于需要导电、抗热震陶瓷材料的应用至关重要。在本研究中，碳陶瓷复合材料的生坯是通过泥浆处理或干粉混合三种 - 粘土、玻璃、氧化铝和炭黑或石墨中的一种或多种来制备的。干燥的生坯在流动的氩气中在 1400 °C 下烧结。除未添加粘土的陶瓷碳复合材料外，均形成了二氧化硅纳米线。在通过含有炭黑或石墨的粉浆浇铸和干粉压制制备的两个样品中都观察到二氧化硅纳米线的形成。TEM 显微照片显示在二氧化硅纳米线的核心处存在碳，表明碳起到了催化剂的作用。选区电子衍射（SAED）表明二氧化硅纳米线是无定形的。先前的研究报告了从硅、二氧化硅、碳化硅形成二氧化硅纳米线，但这是有史以来第一个关于从粘土形成二氧化硅纳米线的报告。