Abstract:

A new cement free iron trough castable was prepared with dense corundum and silicon carbide as the main raw materials and submicron SiO₂ powder (d₅₀=0.242 μm,99.9 mass% SiO₂) as the binder.The effect of the submicron SiO₂ powder addition (3%,4%,5%,6%,7%,8%,and 9%,by mass,respectively) on the properties of the prepared castables was studied.The working mechanism of submicron SiO₂ powder was analyzed from the perspectives of the particle size distribution and infrared absorption spectrum.The results show that:(1)cement free iron trough castables can be prepared using submicron SiO₂ powder alone as the binder;(2)compared with traditional castables,the cement free castables have made a breakthrough in the water addition and the hot modulus of rupture.The optimal submicron SiO₂ powder addition is 4%-6%.

Key words: iron trough castable, cement free, submicron SiO₂ powder, microstructure

摘要：

以致密刚玉、碳化硅等为主要原料,以w(SiO₂)=99.9%的亚微米SiO₂粉体(d₅₀=0.242 μm)为结合剂,制备了一种新型无水泥铁沟浇注料。研究了亚微米SiO₂粉体加入量(质量分数分别为3%、4%、5%、6%、7%、8%、9%)对其性能的影响,并从亚微米SiO₂粉体的粒度分布、红外光谱等角度,分析探讨了亚微米SiO₂粉体的作用机制。结果表明:1)亚微米SiO₂粉体可以单独作为铁沟浇注料的结合剂制备出无水泥铁沟浇注料;2)相比传统铁沟浇注料,无水泥铁沟浇注料在加水量、高温抗折强度等方面取得突破性进展,亚微米SiO₂粉体的最佳加入量为4%~6%(w)。

关键词: 铁沟浇注料, 无水泥, 亚微米SiO₂粉体, 显微结构