不同结合体系刚玉基浇注料的脱水行为  

Investigation on dehydration behavior of Al_2O_3-based castables with different binding system

作　　者：刘敏 周宁生[2] 张三华[1] 

机构地区：[1]中钢集团洛阳耐火材料研究院,洛阳471039 [2]河南科技大学高温材料研究院

出　　处：《耐火材料》2005年第3期176-178,共3页Refractories

摘　　要：分别将水合结合、水合+凝聚结合、凝聚+水合结合和凝聚结合的刚玉基浇注料成型和室温下养护后称量,再依次称量110℃干燥后以及从200℃开始每间隔100℃至1000℃热处理后的质量,以质量损失和变化快慢来反映浇注料在养护和加热过程中的脱水行为。借助XRD、TG和DTA对各浇注料基质浆体的脱水行为和相组成进行分析。浇注料的脱水可分为剧烈、平缓和完成3个阶段。水合结合主导的水泥结合的浇注料和低水泥浇注料的脱水相似,3个脱水阶段分别为室温～300℃、300～600℃和600℃以上。以凝聚结合主导的二氧化硅微粉和水合氧化铝结合的浇注料、MgO-SiO2-H2O结合的浇注料及超低水泥浇注料的脱水行为相似,3个脱水阶段分别为室温～110℃烘干、110～400℃和400℃以上。In this work, dehydration behavior of 5 alumina based castables in correlation with their binding system, i.e. hydraulic, hydraulic+coagulating, coagulating+hydraulic and coagulating bindings respectively, has been investigated by monitoring the mass change during curing at RT, drying at 110°C and heating between 200°C and 1000°C at an interval of 100°C. Dehydration and phase evolution of the dried matrix paste of the castables during heating has also been investigated by means of TG, DTA and XRD. The dehydration of the castables can be divided into acute, mild and finishing stages. The cement bonded and low cement castables, governed by hydraulic binding, have similar dehydration behavior, with their acute, mild and finishing stages being of RT-300°C, 300-600°C and above 600°C respectively; while the ultra-low cement, microsilica plus hydratable alumina bonded and MgO-SiO2-H2O bonded castables, governed by coagulating binding, behave similarly in the dehydration, with the three stages being of RT-110°C, 110-400°C and above 400°C respectively.

关 键 词：脱水行为 刚玉基 结合体 超低水泥浇注料 二氧化硅微粉 水合氧化铝 加热过程 质量损失 600 聚结 室温 热处理 XRD 相组成 DTA 称量 养护 相似 成型 TG 

分 类 号：TQ333.99[化学工程—橡胶工业] TE39[石油与天然气工程—油气田开发工程]