Abstract In this work, cement-free alumina castables with different fiber additives were produced. The effect of commercial polypropylene fibers was compared to that of magnesium borate precursor fibers produced by electrospinning. The drying behavior of different batches was monitored by means of thermogravimetry. Elastic moduli were estimated in dried, sintered and thermally-shocked samples through the impulse excitation technique. The mechanical strength as cold modulus of rupture (CMOR) was measured by three-point bending tests. The open porosity and bulk density after sintering were assessed by water immersion. The thermal shock resistance was evaluated by heating the samples up to 950 ∘C and then quenching with compressed air. After 1 or 5 thermal shock cycles, the residual CMOR was determined. The microstructure of fracture surfaces was analyzed by scanning electron microscopy (SEM). The possible formation of new phases during thermal treatment was also assessed by means of XRD. Finally, the refractoriness under load was measured.

中文翻译：

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添加了通过静电纺丝生产的纤维的氧化铝浇注料

摘要 在这项工作中，生产了不同纤维添加剂的无水泥氧化铝浇注料。将商用聚丙烯纤维的效果与通过静电纺丝生产的硼酸镁前体纤维的效果进行比较。通过热重法监测不同批次的干燥行为。通过脉冲激发技术在干燥、烧结和热震样品中估计弹性模量。通过三点弯曲试验测量作为冷断裂模量 (CMOR) 的机械强度。烧结后的开孔率和堆积密度通过水浸来评估。通过将样品加热至 950 ∘ C，然后用压缩空气淬火来评估抗热震性。在 1 或 5 次热冲击循环后，确定残余 CMOR。通过扫描电子显微镜（SEM）分析断口的微观结构。还通过 XRD 评估了热处理过程中可能形成的新相。最后，测量负载下的耐火度。