含石灰石的镁橄榄石质中间包涂料的性能研究  

Properties of limestone-containing forsterite-based coating for tundish

作　　者：窦刚[1] 李友胜[1] 李胜[1] 李楠[1] 

机构地区：[1]武汉科技大学耐火材料与高温陶瓷国家重点实验室培育基地,湖北武汉430081

出　　处：《耐火材料》2010年第2期108-110,共3页Refractories

摘　　要：研究了结合剂组成、石灰石加入量及粒度对镁橄榄石质中间包涂料经110℃24h、1100℃3h、1550℃3h热处理后的常温物理性能的影响,借助XRD分析了1550℃3h热处理后试样的物相组成,采用热力学软件FactSage5.0计算材料1550℃下的理论液相生成量。结果表明:(1)采用三聚磷酸钠和SiO2微粉复合结合剂有利于提高试样的常温物理性能。(2)随着石灰石质量分数从0增加到30%,试样在1550℃下的液相(钙镁橄榄石)生成量呈递增趋势,说明在镁橄榄石质材料中添加石灰石对其高温性能不利。(3)在石灰石加入量(w)为10%时,加入粒度≤1mm石灰石的试样,经1550℃3h热处理后,常温物理性能最优。Effects of binders,addition and granularity of limestone on physical properties of forsterite-based coating for tundish after heat treated at 110 ℃ for 24 h,1 100 ℃ for 3 h,and 1 550 ℃ for 3 h,respectively,were researched.Phase compositions of the specimens treated at 1 550 ℃ for 3 h were analyzed by XRD,and forming amount of theory liquid phase at 1 550 ℃ was calculated using thermodynamic software FactSage5.0.The results show that：（1）composite binder containing sodium tripolyphosphate and SiO2 powder is beneficial to improve the physical properties of specimens at ambient temperature;（2）with limestone addition（mass percent）increasing from 0 to 30%,forming amount of liquid phase of the specimens at 1 550 ℃ increases gradually,which means that limestone is adverse to the high temperature properties of forsterite-based materials;（3）specimens with 10% limestone（≤1 mm）treated at 1 550 ℃ for 3 h perform the best properties at ambient temperature.

关 键 词：中间包涂料 石灰石 镁橄榄石 结合剂 高温性能 

分 类 号：TQ175.713[化学工程—硅酸盐工业]