Ceramics containing cordierite and mullite as their principal phases are promising for many applications, due to properties such as a low coefficient of thermal expansion, high durability, low dielectric constant, resistance to thermal shock, and refractoriness. The objective of this study was to produce ceramic composites suitable for use as refractory materials. The raw materials were subjected to chemical characterization and the formulations to physical, chemical, and mineralogical characterization. The specimens were formed by pressing, dried at 110°C, and sintered from 1150°C to 1300°C for 2 hours. The following properties were then determined: linear shrinkage, water absorption, apparent porosity, and flexural modulus of rupture. The phases formed, crystal morphology, and coefficient of thermal expansion were evaluated. The cordierite and mullite phases were observed in all formulations at 1250°C and 1300°C. The results obtained from the formulations with a higher content of fine kaolin residue suggest that these formulations have the potential to be used for the manufacture of refractory materials such as furnace rollers and supports.

中文翻译：

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利用工业废料开发堇青石/莫来石复合材料

由于具有诸如低热膨胀系数，高耐久性，低介电常数，抗热冲击性和耐火度的特性，以堇青石和莫来石为主要相的陶瓷有望在许多应用中得到应用。这项研究的目的是生产适合用作耐火材料的陶瓷复合材料。对原材料进行化学表征，并对制剂进行物理，化学和矿物学表征。通过压制形成样品，在110℃下干燥，并在1150℃至1300℃下烧结2小时。然后确定以下性质：线性收缩，吸水率，表观孔隙率和断裂挠曲模量。评价形成的相，晶体形态和热膨胀系数。在所有配方中于1250°C和1300°C观察到堇青石和莫来石相。从具有较高含量的精细高岭土残留物的配方中获得的结果表明，这些配方具有用于制造耐火材料（例如炉辊和支撑物）的潜力。