Abstract Densification behaviors and phase evolution of Mg-doped sialon with different compositions were investigated. The densification generally proceeded in three major stages. The first two stages were associated with the formation of the two lowest ternary oxide eutectics and wetting and solution of α-Si3N4. The third stage involved dissolution/melting of Mg-containing AlN polytypoid and dissolution of α-Si3N4/β-sialon and precipitation of α-sialon. The amount of liquid formed at each stage appeared to be influenced by the initial oxide composition. The third shrinkage was not discernable if the liquid was too little. Particle rearrangement, affected by the amount of available liquid, is considered to be the dominant process at each stage. Mg-containing AlN polytypoid, starting to form at 1400 °C or below, plays a crucial role in determining shrinkage behavior and final densification. The composition, type and stability of these AlN polytypoids were associated with the initial oxide composition and starting overall composition.

中文翻译：

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Mg掺杂赛隆的致密化行为和相演变

摘要 研究了不同成分的掺镁赛隆的致密化行为和相演变。致密化通常分三个主要阶段进行。前两个阶段与两个最低的三元氧化物共晶的形成以及 α-Si3N4 的润湿和溶解有关。第三阶段涉及含镁AlN多型体的溶解/熔化和α-Si3N4/β-赛隆的溶解和α-赛隆的沉淀。在每个阶段形成的液体量似乎受初始氧化物组成的影响。如果液体太少，则第三次收缩无法辨别。受可用液体量影响的粒子重排被认为是每个阶段的主要过程。含镁的 AlN 多型体，在 1400 °C 或以下开始形成，在确定收缩行为和最终致密化方面起着至关重要的作用。这些 AlN 多型体的组成、类型和稳定性与初始氧化物组成和起始总组成有关。