烧结温度对粉煤灰-高钛高炉渣微晶泡沫玻璃孔结构与性能的影响

以粉煤灰、高钛高炉渣和废玻璃为主要原料,CaCO3为发泡剂,Na2B4O7·5H2O为助熔剂,Na3PO4·12H2O为稳泡剂,通过“一步法”粉末烧结制备了微晶泡沫玻璃。借助DSC、XRD和SEM等分析测试手段研究了烧结温度对微晶泡沫玻璃物相组成、气孔结构、体积密度、孔隙率、吸水率及抗压强度的影响。结果表明:烧结温度变化对样品的物相种类影响不显著,析出的晶体主要为透辉石Ca(Mg,Al)(Si,Al)2O6,普通辉石Ca(Mg,Fe)Si2O6以及富铝普通辉石Ca(Mg,Fe,Al)(Si,Al)2O6,同时还含有少量的硅灰石Ca3Si3O9。随着烧结温度的升高,微晶泡沫玻璃的气孔结构变得越来越均匀。然而,940℃时由于小气孔的合并产生了孔径达到2~4 mm的大孔,导致样品的力学性能很低。综合而言,当烧结温度为900℃时,样品孔径大小合适且均匀性好,所制得的泡沫微晶玻璃具备最优综合性能。

Effect of Sintering Temperature on Structure and Properties of Fly Ash-High Titanium Blast Furnace Slag Foam Glass-ceramics

Foam glass-ceramics were prepared by ‘one-step’ process, using fly ash, high titanium blast furnace slag and waste glass as the main materials with adding calcium carbonate as foaming agents, borax as flux agent and trisodium phosphate anhydrous as foam stabilizer. The effects of sintering temperature on phase composition, pore structure, bulk density, porosity, water absorption and compressive strength of foam glass-ceramics were investigated by means of DSC, XRD and SEM. The results showed that the change of sintering temperature has no significant effect on the phase type of the sample. The precipitated crystals are mainly diopside Ca(Mg, Al)(Si, Al)2O6, ordinary pyroxene Ca(Mg, Fe) Si2O6 and aluminum-rich ordinary pyroxene Ca(Mg, Fe, Al)(Si, Al)2O6, while also containing a small amount of wollastonite Ca3Si3O9. As the sintering temperature increases, the pore structure of the foam glass-ceramics becomes more and more uniform. However, large pores with a pore diameter of 2-4mm were produced due to the combination of small pores, resulting in low mechanical properties of the sample at 940℃. In summary, the suitable and uniform pore size of the sample was achieved at 900℃,with the optimum combination property of foam glass-ceramics.