Preparation and properties of glass-ceramics derived from blast-furnace slag by a ceramic-sintering process

摘要

Glass-ceramics were synthesized using ground blast-furnace slag and potash feldspar additives by a conventional ceramic-sintering route. The results show 5 wt percent potash feldspar can enhance the sintering properties of blast-furnace slag glass and the results glass-ceramics have desirable mechanical properties. The main crystalline phase of the obtained glass-ceramic is gehlenite (2CaO-Al_2O_3-SiO_2). A high microhardness of 5.2 GPa and a bending strength higher than 85 MPa as well as a water absorption lower than 0.14 percent were obtained.