Abstract: Blast furnace slag and other auxiliary chemical reagent were used for basic glasses making.The CaO-MgO-Al2O3-SiO2(CMAS) glass-ceramics were prepared by one-step sintering method.Differential scanning thermal spectrum, X-ray diffraction spectrum and field emission scanning electron microscopy were used to investigate the effect of Heat treatment system on crystallization and properties of CMAS glass-ceramics.The results show that with the increase of heat treatment temperature, the main crystal phases of the glass-ceramics are pyroxene, and the secondary crystal phases are feldspar, the precipitation of crystal phase increases, and the bulk density and flexural strength increase first and then decrease.With the increase of heat treatment time, the bulk density and flexural strength showed a decreasing trend.When the heat treatment temperature is 1020 ℃ and the crystallization time is 30 min, the mechanical properties of the sample are the best, the bulk density is 2.690 g·cm-3 and the flexural strength is 67.00 MPa.

Key words: Blast furnace slag and other auxiliary chemical reagent were used for basic glasses making.The CaO-MgO-Al2O3-SiO2(CMAS) glass-ceramics were prepared by one-step sintering method.Differential scanning thermal spectrum, X-ray diffraction spectrum and field emission scanning electron microscopy were used to investigate the effect of Heat treatment system on crystallization and properties of CMAS glass-ceramics.The results show that with the increase of heat treatment temperature, the main crystal phases of the glass-ceramics are pyroxene, and the secondary crystal phases are feldspar, the precipitation of crystal phase increases, and the bulk density and flexural strength increase first and then decrease.With the increase of heat treatment time, the bulk density and flexural strength showed a decreasing trend.When the heat treatment temperature is 1020 ℃ and the crystallization time is 30 min, the mechanical properties of the sample are the best, the bulk density is 2.690 g·cm-3 and the flexural strength is 67.00 MPa.