感应线圈是中频感应电炉的重要部件，线圈的稳定性和可靠性是线圈设计制作及使用过程维护的重要任 务，以某中频感应电炉击穿线圈为研究对象，通过扫描电子显微镜(SEM)、能谱分析(EDS)、红外光谱及显微共聚焦拉曼 光谱等多尺度表征技术，系统分析了线圈表面附着物的理化特性。 结果表明，线圈击穿位置的黑色沉积物以游离碳为 主，拉曼光谱证实碳结构中存在少层石墨烯。熔炼过程中产生大量的CO气体外溢，烧结过程中水蒸气电解是造成一系 列反应发生的主要原因；CO氢还原反应和CO歧化反应是感应电炉运行过程中的主要积碳反应。 混合气体(CO、CO2、 H2、H2 O、O2 )携带游离碳向外扩散的过程中受到Isoplan绝缘板的阻碍，这是造成大量游离碳附着于线圈表面的原因。

 An induction coil is an important part of a medium-frequency induction furnace. The stability and reliability of the coil are important tasks for the design, manufacture and maintenance of the coil. Taking the medium-frequency induction furnace breakdown coil as the research object, the physical and chemical properties of the attachments on the coil surface are systematically analysed via multiscale characterization techniques such as scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), infrared spectroscopy and confocal Raman spectroscopy. The results show that the black attachment on the surface of the coil is mainly free carbon, and Raman spectroscopy confirms the presence of few layers of graphene in the carbon structure. A large amount of CO gas spillover during the smelting process and water vapour electrolysis are the main causes of a series of reactions. The CO hydrogen reduction reaction and CO disproportionation reaction are the main carbon deposition reactions that occur during the operation of an induction furnace. The mixed gas (CO, CO2 , H2 , H2 O, O2 ) is hindered by the Isoplan insulation plate during the outwards diffusion of free carbon, which is the reason why a large amount of free carbon is attached to the coil surface.