摘要
以冶金硅渣为主要原料,采用水淬粉体直接烧结工艺,制备多孔微晶玻璃。利用XRD、DTA/TG、SEM以及图像分析等技术,研究烧结工艺对多孔微晶玻璃气孔孔径、表观密度、晶相组成以及抗压强度的影响。结果表明:多孔微晶玻璃的气孔孔径随烧结温度升高以及烧结时间延长而增大,随升温速率的增大先增大后减小;表观密度随烧结时间延长逐渐增大,随烧结温度升高和升温速率增大呈现出先减小后增大的趋势;抗压强度随烧结温度升高先缓慢增大后急剧降低。多孔微晶玻璃最佳烧结工艺是以30℃/min的升温速率加热到800℃烧结30 min,此时多孔微晶玻璃的平均孔径为1.2 mm,表观密度为0.81 g/cm~3,抗压强度为4.6 MPa。
Porous glass-ceramics were prepared by water quenching powder direct sintering process using metallurgical silicon slag as the main raw materials. The effects of sintering process on pore size,apparent density,crystal composition and compressive strength of the porous glass-ceramics were studied by means of XRD,DTA/TG,SEM and image analysis technique. The results show that the pore size of the porous glass-ceramics increases with the increasing of the sintering temperature and soaking time,and it increases first then decreases with the increasing of the heating rate. The apparent density of the porous glass-ceramics decreases first then increases with the increasing of the sintering temperature and heating rate,and it increases with the extension of the soaking time. The compressive strength of the porous glass-ceramics firstly increases slowly and then decreases rapidly with the increasing of the sintering temperature. The optimal sintering process of the porous glass-ceramics is sintering at 800 ℃ for 30 min with heating rate of 30 ℃/min,and the average pore size,apparent density and compressive strength of the porous glass-ceramics are 1. 2 mm,0. 81 g/cm~3 and 4. 6 MPa,respectively.
引文
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