The effect of mechanochemically activated MgO in Al₂O₃-MgO-C refractory. Part I: Formulation and properties

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• 作者：Abhinav Srivastava ; ^{srivasbhinav@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Nayan Kr. Debnath ; Vijay Kumar ; P. Hemanth Kumar ; Vinay Kumar Singh
• 关键词：A. Milling ; B. X-ray methods ; C. Thermal expansion ; D. Spinels ; E. Refractories
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：10116-10121
• 全文大小：3137 K

文摘

Steel-making processes associate with highly corrosive slag and aggressive reactions giving rise to erosive conditions. In-situ spinel (MgAl₂O₄) shows good slag resistance in Al₂O₃–MgO–C (AMC) secondary refining ladles because spinel has an excellent cation absorption capacity from the slag due to the void spaces in its crystal structure. The aim of our research work was the optimization of in-situ spinel formation in AMC refractory and to minimise the crack and rupture through residual expansion. Mechanically activated reactive magnesia was added up to 10 wt% in different proportions into the starting raw material batches, which comprised of graded fused alumina and flake graphite. A resol type resin was used as a thermosetting binder, and a combination of Al-B₄C fine powder was used as an antioxidant. Prepared briquettes by the cold pressing of these batches were first cured in an oven at resin transition temperature for its polymerization. The samples were then coked at 1400 °C. The quantitative crystallinity was studied using X-ray diffraction patterns. The coefficient of thermal expansion was determined by dilatometric analysis and evaluation of microstructural cracks was examined by SEM.