Buildup Formation Mechanism of Carbon Sleeve in Continuous Annealing Furnace for Silicon Steel

• Published in: Characterization of Minerals, Metals, and Materials 2018 pp. 375 - 385
• Main Authors: He, Mingsheng, Xie, Guohua, Gong, Xuecheng, Zhou, Wangzhi, Zhang, Jing, Xu, Jian
• Format: Book Chapter
• Language: English
• Published: Switzerland Springer International Publishing AG 2018; Springer International Publishing
• Series: The Minerals, Metals & Materials Series
• Subjects: Buildup; Carbon sleeve; Continuous annealing; Mechanism; Silicon steel
• ISBN: 3319724835; 9783319724836
• ISSN: 2367-1181; 2367-1696
• DOI: 10.1007/978-3-319-72484-3_40

Graphite, which has a unique stack structure that enables a small friction coefficient, is used as one kind of the best hearth rolls to support and convey silicon steelSilicon steel strip in continuous annealingContinuous annealing furnace. However, the buildupBuildup formation in/on the surface of carbon sleeveCarbon sleeve has always been a worldwide difficulty in the silicon steelSilicon steel industry. Based on the analysis of the microstructure, topography and composition of the buildupsBuildup, combined with simulation experiments, the mechanismMechanism of forming buildupsBuildup is discussed. The results show that buildupsBuildup experience the process from nucleating to growing-up, and buildupsBuildup are formed by nano liquid phase sintering (NLPS). Meanwhile, some countermeasures to reduce or prevent the formation of the buildupsBuildup are proposed.