红柱石对莫来石-高硅氧玻璃材料性能的影响

Effect of andalusite on properties of mullite-silica-rich glass material

以莫来石M40（3～1 mm、≤1 mm和≤0.088 mm）和红柱石（1～0.5 mm、≤1 mm和≤0.074 mm）为原料,固定骨料和基质质量分数分别为70%和30%,调整红柱石的加入量（≤0.088 mm的加入量分别为0、5%、10%、15%、20%）和粒度（3种粒度分别添加10%）,外加5%的硅溶胶结合剂,经混合、成型和烘干后,于1 200～1 600℃的空气气氛中保温3 h煅烧,测定烧后试样的线变化率、显气孔率、体积密度、耐压强度、荷重软化温度和抗热震性,并用SEM观察热震前后试样的显微结构。结果表明：（1）在相同煅烧温度下,随红柱石粉（≤0.088 mm）含量的增加,试样的线收缩率减小,显气孔率增大,体积密度下降或基本保持不变,耐压强度总体上逐渐增大;（2）在红柱石粉添加量相同的情况下,随煅烧温度的提高,试样线收缩率增大,显气孔率下降,体积密度增大,耐压强度升高;（3）加入不同粒度的红柱石均有利于提高材料的荷重软化温度,且采用1～0.5 mm的红柱石和提高烧成温度更加有效;加入不同粒度红柱石的试样,抗热震性均不是很好,其中以加入≤1 mm红柱石的试样抗热震性最好,加入1～0.5 mm的次之,加入≤0.074 mm的最差。

The specimens were prepared using mullite M40（3～1 mm,≤1 mm and ≤0.088 mm） and andalusite（1～0.5 mm,≤1 mm and ≤0.074 mm） as starting materials with the addition of aggregate and matrix fixed at 70% and 30%.The addition（the content of andalusite ≤0.088 mm is 0,5%,10%,15% and 20%,respectively） and grain size（the content three andalusite powders are all 10%） of andalusite were adjusted and silica sol（5%） was added as binder.After mixing,shaping and drying,the specimens were fired at 1 200 ～ 1 600 ℃ for 3h in air.Permanent linear change,apparent porosity,bulk density,cold crushing strength,refractoriness under load and the thermal shock resistance of the specimens were determined and the microstructure before and after the thermal shock were analyzed by SEM.The results show that：（1）With the same fired temperature,as andalusite（≤0.088 mm） addition increased,the linear shrinkage ratio minished,the apparent porosity increased,the bulk density minished or leveled out,and the crushing strength increased gradually;（2）With the same fine andalusite addition,as firing temperature increased,the linear shrinkage ratio increased,the apparent porosity minished,the bulk density improved,and the crushing strength increased gradually;（3）Adding andalusite with different grain sizes enhanced the refractoriness under load of the material,adopting the 1～0.5 mm andalusite and increasing the firing temperature were more effective;the thermal shock resistance of specimens with different grain sizes of andalusite was not so good,in which,the specimen with andalusite 〈1 mm was the best,following the one with 1～0.5 mm andalusite,the one with ≤0.088 mm andalusite was the worst.