ABSTRACT In this work, cristobalite seeds were doped in silica-based ceramic cores, and the effect of particle size on the properties of ceramic cores was investigated. With decreasing particle size of the cristobalite seeds, the content of crystallised cristobalite in the sintered ceramic cores increased gradually due to the elevated surface area; the linear shrinkage, bulk density and leachability exhibited drastic increase after gradual decrease, and the flexural strength displayed an opposite tendency. When the mean particle size of cristobalite seeds is 5 μm, the ceramic cores showed optimal comprehensive properties, including linear shrinkage of 0.35%, apparent porosity of 31.2%, leachability of 0.31 g min−1, creep deformation of 0.12 mm, and flexural strength of 23.5 MPa at home temperature and 26.0 MPa at 1550°C, which well meets the need of ceramic cores for hollow turbine blades. This work may provide new guidance for enhanced properties of silica-based ceramic cores.

中文翻译：

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通过控制方石英晶种的粒径提高二氧化硅基陶瓷核的性能

摘要 在这项工作中，方石英晶种掺杂在二氧化硅基陶瓷芯中，并研究了粒径对陶瓷芯性能的影响。随着方石英晶种粒径的减小，烧结陶瓷芯中结晶方石英的含量由于表面积的增加而逐渐增加；线收缩率、堆积密度和浸出性呈逐渐下降后急剧上升的趋势，而抗弯强度则呈相反趋势。当方石英晶种平均粒径为 5 μm 时，陶瓷核表现出最佳综合性能，包括线性收缩率为 0.35%，表观孔隙率为 31.2%，浸出率为 0.31 g min-1，蠕变变形为 0.12 mm，弯曲强度为23.5 MPa 在家庭温度和 26.0 MPa 在 1550°C，很好地满足了空心涡轮叶片陶瓷芯的需要。这项工作可能为提高二氧化硅基陶瓷芯的性能提供新的指导。