Sinterability,crystal phase composition and properties of high strength glazed glass-ceramics prepared by stepwise sintering using granite powder
High strength glazed glass-ceramics were prepared using a stepwise sintering method consisting of dense sintering and instantaneous glaze firing at high-temperatures,using only granite sludge as raw material.The effects of ball milling and magnetic separation on the characteristics of the granite powders were analyzed using X-ray diffraction,X-ray fluorescence spectroscopy,laser particle size analysis and powder whiteness testing.The effects of stepwise sintering process on the powder sintering behavior and the crystal phase composition,bending strength and surface glossiness of sintered glass-ceramics were studied.The results show that the ball milling and magnetic separation refine the powder particles,improve the whiteness and sintering activity of the powder,and improve the mechanical properties and aesthetics of the glass-ceramics.After dense sintering at 1100 ℃,high-temperature instantaneous glaze firing accelerates the dissolution of anorthite and quartz in the glass phase,forming a surface glaze layer,and the surface glossiness increases with the increase of glaze firing temperature.After the acid-leached powder is densely sintered,it is quickly heated to 1300 ℃ for instantaneous glaze firing,the pinholes on the glaze surface are completely eliminated,and the comprehensive performance of the glass-ceramics is the best,with flexural strength and surface glossiness reaching 112.5 MPa and 54.7 GU,respectively.
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