Effect of Mg/Al Ratios on Hydration Mechanism of Tabular Alumina Carbon Composites Reinforced by Al4C3 in situ Reaction  

作　　者：杨依帆 JIANG Mingxue YANG Ding'ao YUAN Shouqian ZHAO Jizeng ZHAO Wei YANG Mengyao 

机构地区：[1]College of Materials and Mineral Resources,Xi'an University of Architecture and Technology,Xi'an 710055,China [2]Beijing Lier High-Temperature Materials Co.,Ltd,Beijing 102211,China [3]Fuzhou University Zhicheng College,Fuzhou 350002,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2017年第4期800-805,共6页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Torch Plan of China(No.2005EB031110);the Key Scientific and Technical Innovation Project of Xi’an University of Architecture and Technology(No.zx 0402)

摘　　要：Hydration mechanism of tabular alumina carbon composites reinforced by Al4C3 in situ reaction with Mg and Al was researched in water steam using super automatic thermostatic water bath from 25 ℃ to 85 ℃. It is shown that hydration mechanism of the composites is chemical reaction control at 44.3 ℃-84 ℃ in H2O（g）. The hydration was controlled by diffusion from 24.7 ℃ to 33 ℃. The ratio of added Mg/Al influences the HMOR of the composites.The mechanism of HMOR of the composites with different ratios of Mg/Al can be discovered by means of SEM analysis. The active Mg/Al powder and flake graphite inside give the composites outstanding hot strength resulting from the interlocking structure of Al4C3 crystals at high temperature. Besides, the matrix changes into the Al4C3 with high refractoriness. The method of preventing the hydration of tabular alumina carbon composites reinforced by Al4C3 in situ reaction was immersed in the wax at suitable temperature or storing them below 33 ℃ in a dry place or storing them with paraffin-coating.Hydration mechanism of tabular alumina carbon composites reinforced by Al4C3 in situ reaction with Mg and Al was researched in water steam using super automatic thermostatic water bath from 25 ℃ to 85 ℃. It is shown that hydration mechanism of the composites is chemical reaction control at 44.3 ℃-84 ℃ in H2O（g）. The hydration was controlled by diffusion from 24.7 ℃ to 33 ℃. The ratio of added Mg/Al influences the HMOR of the composites.The mechanism of HMOR of the composites with different ratios of Mg/Al can be discovered by means of SEM analysis. The active Mg/Al powder and flake graphite inside give the composites outstanding hot strength resulting from the interlocking structure of Al4C3 crystals at high temperature. Besides, the matrix changes into the Al4C3 with high refractoriness. The method of preventing the hydration of tabular alumina carbon composites reinforced by Al4C3 in situ reaction was immersed in the wax at suitable temperature or storing them below 33 ℃ in a dry place or storing them with paraffin-coating.

关 键 词：hydration mechanism tabular alumina carbon Al4C3 Mg/Al ratios 

分 类 号：TB332[一般工业技术—材料科学与工程]