Abstract The effect of the pore size on the properties of insulating firebricks was studied when different grain sizes of the expanded polystyrene (EPS) were used as an organic pore-forming agent. In particular, porous firebricks were produced by extruding of EPS and other materials. Due to the different grain sizes of EPS, insulating firebricks with different pore sizes were obtained. The results showed that the bricks with a smaller pore size (EPS 1.4 samples) had higher cold crushing strength. It is due to the higher continuity of the solid phase between the pores of the EPS 1.4 samples regarding EPS 2.8 bricks. Although the percent of reheat change of both EPS 2.8 and EPS 1.4 samples were nearly equal up to 1000 °C, EPS 2.8 bricks shrank faster than EPS 1.4 firebricks above 1000 °C. The thermal conductivity of the EPS 2.8 samples was higher than EPS 1.4 bricks. It can be concluded that in equal volume fraction of voids, the greater the number of pores of smaller size, the lower the thermal conductivity.

中文翻译：

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发泡聚苯乙烯作为造孔剂的尺寸对隔热耐火砖性能的影响

摘要 以不同粒径的发泡聚苯乙烯（EPS）为有机成孔剂，研究了孔径对隔热耐火砖性能的影响。特别是多孔耐火砖是通过挤压EPS和其他材料生产的。由于EPS的粒度不同，得到了不同孔径的隔热耐火砖。结果表明，孔径较小的砖（EPS 1.4 样品）具有较高的冷压强度。这是由于 EPS 2.8 砖的 EPS 1.4 样品孔隙之间的固相具有更高的连续性。尽管 EPS 2.8 和 EPS 1.4 样品的再加热变化百分比在 1000 °C 时几乎相等，但在 1000 °C 以上时，EPS 2.8 砖比 EPS 1.4 耐火砖收缩得更快。EPS 2 的热导率。8 个样品高于 EPS 1.4 砖。可以得出结论，在相同体积分数的空隙中，较小尺寸的孔数量越多，导热系数越低。