通过几何优化在 ZrB2 陶瓷的火花等离子烧结过程中获得更高温度的模拟方法

Milad Sakkaki, Mohsen Naderi, M. Vajdi, Farhad Sadegh Moghanlou, Ali Tarlani Beris
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引用次数: 0

摘要

本研究利用 COMSOL Multiphysics 中的有限元方法,对二硼化锆(ZrB2)陶瓷的火花等离子烧结(SPS)工艺进行了详细分析。重点是了解石墨模中 ZrB2 样品在 SPS 过程中的温度分布。利用热扩散方程,并考虑焦耳加热因素,模拟系统内温度随时间的变化。系统末端的临界边界条件被模拟为对流冷却。方差分析 (ANOVA) 表明,样品直径是影响 ZrB2 样品中心峰值温度的最重要因素。研究发现,样品直径的方差对温度的影响最大,明显高于模具外径和样品厚度等其他因素。值得注意的是,所有样品轴向温度的标准偏差均小于 4 °C,与烧结温度(约 2000 °C)相比,这一数值在统计学上微不足道。这些发现有助于深入了解 SPS 过程,这对优化 ZrB2 陶瓷的烧结参数至关重要。
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A simulative approach to obtain higher temperatures during spark plasma sintering of ZrB2 ceramics by geometry optimization
This study provides a detailed analysis of the Spark Plasma Sintering (SPS) process for Zirconium Diboride (ZrB2) ceramics, utilizing the finite element method in COMSOL Multiphysics. The focus is on understanding the temperature distribution during the SPS of a ZrB2 sample in a graphite die. Heat diffusion equations, augmented with Joule heating considerations, are utilized to simulate temperature variations within the system over time. Critical boundary conditions at the system's extremities are modeled as convection cooling. The Analysis of Variance (ANOVA) reveals that the diameter of the sample is the most significant factor influencing the peak temperature at the center of the ZrB2 sample. It is found that the sample diameter's variance accounts for a predominant impact on temperature, markedly more than other factors such as the die's outer diameter and sample thickness. Notably, the standard deviation of the temperature in the axial direction across all samples is less than 4 °C, a value that is statistically minor in comparison to the sintering temperatures, which are around 2000 °C. These findings are instrumental in providing an in-depth understanding of the SPS process, which is essential for the optimization of sintering parameters for ZrB2 ceramics.
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