莫来石轻质球形料结构与性能

Structure and Properties of Lightweight Spherical Mullite

对以铝矾土为主要原料制备获得的莫来石轻质球形料进行了系统的结构与性能研究,研究结果表明:轻质莫来石球形料的主要化学成分为Al_2O_3和SiO_2,物相为莫来石相,球形颗粒表面莫来石柱状结晶交织排布,内部含有大量气孔,堆积密度为1.60 g/cm^3,颗粒体积密度为1.75 g/cm^3,显气孔率为38%,耐火度大于1790℃,800℃下导热系数为0.245 W/(m·K),热震5次后球形保持率大于95%。

The structure and performance of lightweight spherical mullite, whose main constituent is bauxite, have been investigated for its chemical and physical phase compositions, macro and microstructures, and high temperature performance. The results show that Si02 and A1203 are the main chemical components and mullite is the predominant mineral phase. Pillars of the spherical particles present on the surfaces of the mullite crystals are observed in an interweaved configuration. The material is porous, with a packing density of 1. 60 g ？ cm-3, bulk density 1. 75 g · cm-3, and porosity 38% .The material become refractory at temperatures greater than 1790 Tl and exhibit a thermal conductivity of 0.245 W m _1 K _1 at 800 XI. the Residual rare of spherical of 95% by 5 repeated thermal shocks （water-quench experiments） for Mullite light spherical material.