Abstract The influence of the additive β-Si3N4 on the formation and oxidation of Si4Al2O2N6 during the sintering of Al, Si, and Al2O3 powders under flowing nitrogen atmosphere was examined. An increasing molar percentage of β-Si3N4 was shown to alter the morphology of Si4Al2O2N6 from a fiber-like to a rod-like structure and also shortened the time needed to form a dense, continuous oxide layer, which served as a barrier to the diffusion of O2. An optimal molar percentage of β-Si3N4 of 29.9 mol% was discovered, at which the grain growth was enhanced, and the surface area was, in turn, reduced, yielding superior resistance to oxidation. Our results provided a theoretical basis for the formation of β-SiAlON and demonstrated the potential of its use in high-temperature oxidizing environments.

中文翻译：

---

β-Si3N4对β-SiAlON形成和氧化的影响

摘要 研究了添加剂β-Si3N4 在流动氮气气氛下烧结Al、Si 和Al2O3 粉末过程中对Si4Al2O2N6 形成和氧化的影响。增加的 β-Si3N4 摩尔百分比显示出将 Si4Al2O2N6 的形态从纤维状结构改变为棒状结构，并且还缩短了形成致密、连续氧化物层所需的时间，作为扩散的屏障的 O2。发现了 29.9 mol% 的 β-Si3N4 的最佳摩尔百分比，在该百分比下，晶粒生长得到增强，表面积反过来减少，从而产生优异的抗氧化性。我们的研究结果为 β-SiAlON 的形成提供了理论基础，并证明了其在高温氧化环境中的应用潜力。