Abstract

High strength glass-ceramics were fabricated with coal gangue as main raw material. The effects of the utilization rate of the coal gangue, mineral additives, mineralization agents, forming process, and sintering process on the properties of the glass-ceramics were studied. The optimal utilization rate of coal gungue is 55 wt% when the utilization rate of another mineral material bauxite is 35 wt%. The glass-ceramics showed a main crystal phase of mullite. BaCO3 and MnCO3 codoping and cosubstitution as mineralization agents obviously enhanced the properties of the glass-ceramics. The strength of 148.36-156.12 MPa, water absorption of 0.17-0.02%, and density of 2.66-2.68g/cm3 were achieved for the glass-ceramics. By optimization experiments, reasonable and optimal processing parameters of forming and sintering were also determined.

Keywords: Coal cangue; Glass-Ceramics; Process optimization; Mechanics property