Submicron SiO₂ Powder: Characterization and Effects on Properties of Cement-Free Iron Ditch Castables

Figure 5

SEM images of samples with different submicron SiO₂ powder contents: (a) 3 wt%; (b) 5 wt%; (c) 7 wt%; (d) 9 wt%.

(a)

(b)

(c)

(d)