Abstract Expanded graphite with nano SiC and amorphous SiC x O y coating was successfully prepared through pyrolysing silane coupling agent (SCA), where the grafting of SCA dominated the final products. The results show that mainly amorphous SiC x O y coating covers expanded graphite at 1000 °C, regardless of the SCA concentration. In comparison, nano SiC coating can be synthesized at 1200 °C depending on the good dispersion of SCA (with a SCA concentration of 50 vol%). The formed SiC coating contributes to much higher peak oxidation temperature (812.1 °C) than 678.0 °C of the pure expanded graphite. Meanwhile, the oxidation activation energies of expanded graphite are remarkably improved from 149.15 kJ/mol to 176.16 kJ/mol (based on Kissinger method), attributing to the derived nano SiC and SiC x O y coating.

中文翻译：

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通过纳米 SiC 涂层提高膨胀石墨的抗氧化性

摘要 通过热解硅烷偶联剂(SCA) 成功制备了纳米SiC 和非晶SiC x O y 涂层的膨胀石墨，其中SCA 的接枝主导了最终产品。结果表明，无论 SCA 浓度如何，在 1000 °C 时，主要是无定形 SiC x O y 涂层覆盖膨胀石墨。相比之下，纳米 SiC 涂层可以在 1200 °C 下合成，这取决于 SCA 的良好分散性（SCA 浓度为 50 vol%）。与纯膨胀石墨的 678.0°C 相比，形成的 SiC 涂层有助于更高的峰值氧化温度 (812.1°C)。同时，膨胀石墨的氧化活化能从 149.15 kJ/mol 显着提高到 176.16 kJ/mol（基于 Kissinger 方法），这归因于衍生的纳米 SiC 和 SiC x O y 涂层。