花岗岩粉体分步烧结高强度釉面微晶玻璃的烧结行为、晶相组成及性能

Sinterability,crystal phase composition and properties of high strength glazed glass-ceramics prepared by stepwise sintering using granite powder

仅以花岗岩泥渣为原料,采用致密烧结-高温瞬时釉烧的两步烧结法制备了高强度釉面微晶玻璃。利用X射线衍射、X射线荧光光谱分析、激光粒度分析和粉体白度测试等分析了球磨和磁选对花岗岩粉体特性的影响,研究分步烧结工艺对粉体烧结行为及微晶玻璃的晶相组成、抗弯强度和表面光泽度的影响。结果表明:球磨和磁选使粉体颗粒细化,提高粉体白度和烧结活性,改善微晶玻璃力学性能及美观性。1100℃致密烧结后,高温瞬时釉烧加速钙长石和石英溶于玻璃相,形成表面釉层,表面光泽度随釉烧温度升高而增大。酸洗粉体致密烧结后,快速升温至1300℃进行瞬时釉烧,釉面针孔完全消除,微晶玻璃的综合性能最佳,抗弯强度和表面光泽度分别达到112.5 MPa和54.7 GU。

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 glassceramics is the best,with flexural strength and surface glossiness reaching 112.5 MPa and 54.7 GU,respectively.