本文旨在进行SPS过程中粉末颗粒内部温度场的模拟及颈部演变的研究。建立了用于模拟导电材料在SPS过程中粉末颗粒的热传导行为的计算模型。以球形铜粉为研究对象，对颗粒内部温度分布和颈部尺寸变化进行了模拟计算和分析，模拟结果表明SPS过程中颗粒内部的温度分布极不均匀，颈部尺寸的长大速度在烧结过程中并不一致。不同烧结阶段颈部尺寸变化的模拟结果和实验测定结果基本吻合，证明了本文模型的合理性。本文研究结果揭示了SPS过程中烧结颈部形成和长大的本质机制。
In the paper, temperature distribution in the powder particles during SPS was simulated and the process of neck evolution was studied. A model has been developed to simulate the heat transfer behavior during SPS process. By using the pure spherical copper particles as an example, the temperature distribution and the neck size evolution of the powder particles have been studied. There is a greatly inhomogeneous distribution of the temperature in the particle, and the growth rates of the necks are different. The obtained simulation results show a good agreement with the experimental measurements, which confirmed the reasonability of the model developed in the present work. By the modeling and experimental studies, the intrinsic mechanisms of neck formation and neck growth are well explained.
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