硅溶胶结合碳化硅质浇注料的研制及其热修应用

Preparation and Application of Sol Combined Carborundum

以98碳化硅（粒径为3～5mm、1～3mm及0～1mm）为骨料，以98碳化硅粉（≤0．043mm），活性α-Al2O3微粉为细粉；研制了采用硅溶胶作结合剂的碳化硅质浇注料。该浇注料具有较高的中温和高温强度，实验测得经800℃×3h和1400℃×3h处理后的其试样抗折强度和耐压强度都分别达到了15．0MPa和80．0MPa以上；试样具有良好的抗渣侵蚀性、热震稳定性（采用1100℃≠水冷抗热震循环实验〉100次），和较好的导热性能，实验测得110℃导热系数为26．81W／m·K，200℃导热系数为23．42W／m·K，500℃导热系数为21．75w／m·K，1000℃导热系数为18．91W／m·K；同时该浇注料还具有较好的高温施工性能和可快速烘烤性，有效的简化了干燥和烘烤工艺，缩短了高炉的休整时间，提高了高炉生产效率。

The composition of the samples were used carborundum with the grain size of 3-5 mm, 1-3 mm and ≤ 1 mm as the aggregates, the carborundum powder（grain size 40. 043 ram） and the active α-Al2O3 micro powder are served as the fine powder to develop and prepare the silica-sol to cement carborundum castable. This castable is provided with higher medium-temperature and high-temperature strength, and the rupture strength and compression strength for this casting after being treated under 810℃ × 3 h and 1400 ℃ × 3 h reach over 15.0 MPa and 80.0 MPa respectively, with favorable slag-erosion resistance and thermal-shock resistance stability （with adoption of 1100 ~C →←-water-cooling thermal-shock resistance circulation experiment 〉 100 times） ; Excellent thermal conductivity： the measured thermal conductivity coefficient is of 26.81 W/m · K via experiment at 110 22, with 23.42 W/m · K for thermal conductivity coefficient at 200℃and 21.75 W/m ·K for thermal conductivity coefficient at 500 22 as wall as 18.91 W/m - K for thermal conductivity coefficient at 1000 22. Meanwhile, this castable is also provided with better high-temperature construction performance and rapid baking property to effectively simplify the drying and baking technology, shorten the time of damping down for blast furnace and improve the productivity of blast durance.