Influence of CeO_2 addition on the preparation of foamed glass-ceramics from high-titanium blast furnace slag

摘要

Foamed glass-ceramics doped with cerium oxide(CeO_2)were successfully prepared from high-titanium blast furnace slag by one-step sintering.The influence of CeO_2 addition(1.5wt%–3.5wt%)on the crystalline phases,microstructure,and properties of foamed glass-ceramics was studied.Results show that CeO_2 improves the stability of the glass phase and changes the two-dimensional crystallization mechanism into three-dimensional one.XRD analysis indicates the presence of Ca(Mg,Fe)Si_2O_6 and Ca(Ti,Mg,Al)(Si,Al)_2O_(6 )in all sintered samples.Added with CeO_2,Ti CeO_4 precipitates,and crystallinity increases,leading to increased thickness of pore walls and uniform pores.The comprehensive properties of foamed glass-ceramics are better than that of samples without CeO_2.In particular,the sample added with a suitable amount of CeO_2(2.5wt%)exhibits bulk density that is similar to and compressive strength(14.9 MPa)that is more than twice of foamed glass-ceramics without CeO_2.