Abstract In order to improve the chemical leachability, the alumina-based ceramic core material with the silica fiber was injected and sintered at 1100 °C/4 h, 1200 °C/4 h, 1300 °C/4 h and 1400 °C/4 h, respectively. The micrographs of ceramic core materials at sintered and leached state were characterized by scanning electron microscopy (SEM). The phase composition of ceramic core material after sintering and the leaching product after leaching were detected by X-ray diffraction (XRD). The porosity, room temperature bend strength, creep property at elevated temperature and the leaching rate in aqueous caustic solution were studied. The experimental results show that the ceramic core material with silica fiber obtain a fair balance between mechanical and chemical properties at sintering of 1300 °C/4 h. Specifically, the leach rate of ceramic core material with silica fiber is increased apparently. High leaching surface and weak adhesive strength between agglomerated alumina particles are the reasons that responsible for the ceramic core material with silica fiber be leaching fast than that of the ceramic core material without fiber.

中文翻译：

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二氧化硅纤维对氧化铝基陶瓷芯材力学和化学行为的影响

摘要 为了提高化学浸出性，将含有二氧化硅纤维的氧化铝基陶瓷芯材分别在 1100 ℃/4 h、1200 ℃/4 h、1300 ℃/4 h 和 1400 ℃/分别为 4 小时。陶瓷芯材料在烧结和浸出状态的显微照片通过扫描电子显微镜 (SEM) 进行表征。通过X射线衍射(XRD)检测烧结后陶瓷芯材的相组成和浸出后的浸出产物。研究了孔隙率、室温弯曲强度、高温蠕变特性和在苛性碱水溶液中的浸出率。实验结果表明，具有二氧化硅纤维的陶瓷芯材在 1300 °C/4 h 的烧结温度下获得了机械和化学性能之间的公平平衡。具体来说，石英纤维陶瓷芯材的浸出率明显提高。团聚氧化铝颗粒之间的高浸出表面和弱粘合强度是导致含二氧化硅纤维的陶瓷芯材比不含纤维的陶瓷芯材浸出快的原因。