Hélène Aréna, Moustapha Coulibaly, Nicolas Pradeilles, Adel Mesbah, Alban Jonchère, Guilhem Arrachart, Marion Vandenhende, Alexandre Maître, Samuel Bernard, Xavier Deschanels
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引用次数: 0
摘要
这项研究旨在了解 TiC-SiC 纳米复合陶瓷材料的氧化机理。通过改变复合材料的相对密度、加热速率和停留时间，在空气中对样品进行了高达 1400°C 的热处理。通过热重分析和质谱分析跟踪重量变化。然后用扫描电子显微镜（SEM-EDX）观察氧化样品的横截面，并用透射电子显微镜（TEM-EDX）研究其微观结构和成分。此外，还通过原位高温 X 射线衍射和高温环境扫描电子显微镜跟踪了氧化过程。在 1000°C 之前，观察到多层蚀变鳞片的形成，其中有一层致密的二氧化硅保护层。超过 1200°C 时，该层出现裂纹，氧化程度加剧。根据研究结果，提出了 TiC 和 SiC 随温度变化向后续氧化物转化的三步机制。
This work aims at understanding the oxidation mechanism of a TiC–SiC nanocomposite ceramic material. Samples were subjected to heat treatments up to 1400°C under air, varying the relative density of the composite, the heating rate, and the dwell time. The weight variations were followed by thermogravimetric analyses coupled with mass spectrometry. The oxidized samples were then characterized by scanning electron microscopy on cross-sections (SEM-EDX) and their microstructure and composition were studied by transmission electron microscopy (TEM-EDX). The oxidation process was also followed by in situ high-temperature X-ray diffraction and high-temperature environmental scanning electron microscopy. Until 1000°C, the formation of a multilayer alteration scale was observed, with a dense and protective SiO2 layer. Above 1200°C, this layer showed cracks, and the oxidation was increased. Based on the results, a three-step mechanism was proposed for the temperature-dependent conversion of TiC and SiC to the subsequent oxides.
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The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials.
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