Effect of Crystallization Temperature on Properties of Silicon Fume Glass-Ceramics
In order to respond to the national call for recycling of solid waste resources and adhere to the concept of green development,high-silicon waste silica fume was used as the main raw material,and CaO-Al2O3-SiO2 series glass-ceramics were prepared by the overall crystallization method.The crystal phase type and micromorphology of glass-ceramics were characterized by TG-DSC,XRD,SEM,and the physical and chemical properties of glass-ceramics were tested.The studies show that after 2 h nucleation at 900 ℃ and the crystallization temperature is 1 150 ℃ for 2 h,glass-ceramics with anorthite as the main crystal phase can be prepared.When the crystallization temperature continues to rise to 1 200℃,a small amount of bubbles appear in glass-ceramics,and internal defects appear,which results in the decline of crystallization effect and physical and chemical properties.The glass-ceramics prepared by this method have excellent mechanical properties,the flexural strength is 93.58 MPa,the Vickers hardness is 845.62 HV0 5,the bulk density is 2.88 g/cm3.
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