烧结时间对高钛高炉渣-粉煤灰微晶泡沫玻璃的影响

Effect of Sintering Time on High Titanium Blast Furnace Slag-Fly Ash Foam Glass-Ceramics

以高钛高炉渣、粉煤灰和废玻璃粉为主要原料,硼砂为助熔剂,碳酸钙为发泡剂,十二水磷酸钠为稳泡剂,通过烧结法制备了微晶泡沫玻璃。研究了烧结时间对微晶泡沫玻璃析出相、微观形貌、体积密度、抗压强度、吸水率及热导率的影响。结果表明,在900℃下,烧结时间变化对析出相影响不显著,主要为透辉石Ca(Mg,Al)(Si,Al)2O6,富铝普通辉石Ca(Mg,Fe,Al)(Si,Al)2O6以及普通辉石Ca(Mg,Fe)Si2O6。随烧结时间从0 min延长至30 min,材料孔径大小变得越来越均匀,抗压强度、体积密度、热导率先升高后降低,吸水率逐渐降低;烧结时间在30~60 min时材料孔径大小不均匀,抗压强度下降,体积密度、热导率逐渐升高,吸水率先升高后降低。综合而言,当烧结时间为30 min时,微晶泡沫玻璃具备最优综合性能。

Foam glass-ceramics were prepared by sintering method,using high titanium blast furnace slag(HTBFS),fly ash and waste glass powder as the main materials,with adding borax as fluxing agents,calcium carbonate as foaming agents,and trisodium phosphate as foam stabilizers.The effects of sintering time on precipitated phase,micromorphology,bulk density,compressive strength,water absorption and thermal conductivity of foam glass-ceramics were investigated.The results show that the change of sintering time has no significant effect on the precipitated phase type of the sample at 900℃.The precipitated crystals are mainly diopside Ca(Mg,Al)(Si,Al)2O6,aluminum-rich ordinary pyroxene Ca(Mg,Fe,Al)(Si,Al)2O6 and ordinary pyroxene Ca(Mg,Fe)Si2O6.With the sintering time extending from 0 min to 30 min,the pore size of the material becomes more and more uniform,the compressive strength,bulk density,and thermal conductivity first increase and then decrease,and the water absorption rate gradually decreases.The pore size of the material is uneven,the compressive strength decreases,the bulk density and thermal conductivity gradually increase,and the water absorption first increases and then decreases at the sintering time from 30 min to 60 min.In summary,when the sintering time is 30 min,the foam glass-ceramics have the best overall performance.