Grain growth has a definitive impact on the quality of transparent sintered materials in areas such as ballistics, biomaterials, jewelry, etc. Controlling the sintering trajectory at the precise moment of final stage sintering is one of the main sintering challenges for obtaining high-performance, fully-dense nano-ceramics. However, the final stage of sintering involves a very complex coupling between the rate of porosity elimination/grain growth and transition mechanisms. This complexity makes predicting the sintering trajectory very difficult, and most transparent material production escapes this problem by using expensive high-pressure methods such as hot isostatic pressing (HIP). In the quest for a pressureless transparent material process, this paper addresses the challenge of predicting grain growth in the transition domain from the grain growth onset (in a high porosity region) to full density for MgAl₂O₄ spinel. We present a comprehensive modeling approach linking theoretical models such as Zhao & Harmer's and Olevsky's equations to accurately predict the complex grain growth transition region of final stage sintering. This modeling approach opens up the possibility for numerical exploration of microstructure development via underlying kinetics experimental identification.

晶粒长大对防弹，生物材料，珠宝等领域的透明烧结材料的质量有决定性的影响。在最终烧结的精确时刻控制烧结轨迹是获得高性能，全密实纳米陶瓷。但是，烧结的最后阶段涉及孔隙消除/晶粒长大的速率与过渡机制之间的非常复杂的耦合。这种复杂性使得预测烧结轨迹非常困难，并且大多数透明材料的生产都通过使用昂贵的高压方法（例如热等静压（HIP））避免了这个问题。为了寻求一种无压力的透明材料工艺，₂ O ₄尖晶石。我们提出了一种综合的建模方法，该方法将诸如Zhao＆Harmer's和Olevsky方程等理论模型联系起来，以准确地预测最终烧结阶段的复杂晶粒生长过渡区域。这种建模方法通过潜在的动力学实验识别为微结构发展的数值探索开辟了可能性。