ABSTRACT Suitable sintering ability and excellent densification are important factors for forsterite (Mg2SiO4) ceramics and refractories when used in glass furnaces, continuous casting tundishes, non-ferrous metal smelters, etc. Here, a dense and fine-grained structure has been obtained in the forsterite ceramics prepared by two-step sintering process. Results show that combination of grinding and second step sintering can eliminate MgSiO3 secondary phase, reduce intergranular pores and increase sintering densification of forsterite. By substituting mechanical activation for grinding, grain refinement and microstructural uniformity can be further promoted, resulting in increased bulk density and enhanced cold crushing strength. This work suggests that combination of two-step sintering and mechanical activation is effective for the preparation of forsterite ceramics with excellent densification and microstructure used in the high temperature industrial field. GRAPHICAL ABSTRACT

中文翻译：

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镁橄榄石陶瓷显微组织和力学性能的合成及加工影响

摘要 镁橄榄石（Mg2SiO4）陶瓷和耐火材料用于玻璃窑炉、连铸中间包、有色金属冶炼厂等时，合适的烧结能力和优异的致密性是重要的因素。两步烧结法制备镁橄榄石陶瓷。结果表明，研磨和二次烧结相结合，可以消除MgSiO3次生相，减少晶间孔，增加镁橄榄石的烧结致密化。通过机械活化替代研磨，可以进一步促进晶粒细化和微观结构的均匀性，从而增加堆积密度和增强冷压强度。这项工作表明，两步烧结和机械活化相结合对于制备用于高温工业领域的具有优异致密化和微观结构的镁橄榄石陶瓷是有效的。图形概要