In this work, the expanded perlite (EP) was used as an additive in local Hang Dong (HDC) and San Kham Phang (SPC) clays from Chiang Mai province, Thailand, for wall tile manufacturing and its influence on various properties were investigated. All samples were fabricated by drying and sintering the mixtures at 1100 °C for 8 h. Fired bulk density, shrinkage, water absorption and modulus of rupture were measured. With increasing perlite content, the density showed a decreasing trend (2.16–1.62 g/cm3 for HDC clay and 2.13 to 1.37 g/cm3 for SPC clay) with the corresponding reduction in the modulus of rupture. Both types of clays showed higher water absorbability when more perlite was added, indicating the hygroscopic properties of porous perlite particles. Phase and chemical composition indicated the uniform distribution of pea-pod-like perlite structure in clay matrix with strong interfacial bonding due to chemical reaction between perlite additive and clay matrix. X-ray attenuation coefficient was found to decrease in correspondence with the decreasing trend in density values. The thermal conductivity of perlite-added Hang Dong clay exhibited at least 10 times reduction compared to pure clay, suggesting the excellent insulation behavior. The HDC with 100 and 200 cm3 perlite showed good performance in terms of rupture strength, water absorbability, X-ray attenuation with additional insulation properties. Based on this perlite-clay composite study, the sample could be further optimized for its X-ray shielding application by infiltration with elemental or alloy particles.

中文翻译：

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烧制粘土-珍珠岩复合材料的隔热和X射线衰减性能


在这项工作中，膨胀珍珠岩 (EP) 被用作泰国清迈省当地 Hang Dong (HDC) 和 San Kham Phang (SPC) 粘土的添加剂，用于墙砖制造，并研究了其对各种性能的影响。所有样品均通过将混合物在 1100°C 下干燥和烧结 8 小时制成。测量烧成的堆积密度、收缩率、吸水率和断裂模量。随着珍珠岩含量的增加，密度呈下降趋势（HDC 粘土为 2.16–1.62 g/cm3，SPC 粘土为 2.13 至 1.37 g/cm3），断裂模量相应降低。当添加更多珍珠岩时，两种类型的粘土都表现出更高的吸水性，表明多孔珍珠岩颗粒的吸湿性能。相和化学成分表明，由于珍珠岩添加剂和粘土基质之间的化学反应，豌豆荚状珍珠岩结构在粘土基质中均匀分布，具有很强的界面结合。发现X射线衰减系数随着密度值的下降趋势而下降。添加珍珠岩的杭东粘土的导热系数比纯粘土降低了至少 10 倍，表明其具有优异的隔热性能。含有 100 和 200 cm3 珍珠岩的 HDC 在断裂强度、吸水性、X 射线衰减以及额外的绝缘性能方面表现出良好的性能。基于这项珍珠岩-粘土复合材料研究，可以通过元素或合金颗粒渗透来进一步优化样品的 X 射线屏蔽应用。