Abstract The densification and phase formation of 6 wt% Y 2 O 3 containing SiC compacts infiltrated by aluminium vapour were investigated. The densification occurred through infiltration of aluminium vapour that formed through a reaction between alumina and carbon powders at 2000 °C. Infiltrated specimens were evaluated concerning the density, phase, microstructure and mechanical properties including hardness and fracture toughness. X-ray diffraction studies showed the presence of yttrium aluminium garnet (YAG) and Al 2 O 3 as the secondary phases along with other minor phases. Sectioning of the infiltrated specimen showed two regions: a dense layer starting from the surface of about 1 mm thickness followed by a relatively porous structure at the core. The effect of infiltration depth on densification and evolution of microstructure are studied. Also, the changes in Vickers’ hardness and fracture toughness with the increase in specimen depth are discussed.

中文翻译：

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铝蒸气渗透致密化碳化硅陶瓷的微观结构演变和机械性能研究

摘要 研究了含 6 wt% Y 2 O 3 的 SiC 压块被铝蒸汽渗透的致密化和相形成。通过氧化铝和碳粉在 2000 °C 下反应形成的铝蒸气的渗透，发生致密化。对渗透试样的密度、相、微观结构和机械性能（包括硬度和断裂韧性）进行评估。X 射线衍射研究表明存在钇铝石榴石 (YAG) 和 Al 2 O 3 作为第二相以及其他次要相。渗透样品的切片显示出两个区域：从表面开始的约 1 毫米厚的致密层，然后是核心处的相对多孔结构。研究了入渗深度对微结构致密化和演化的影响。