ABSTRACT The mechanisms of densification during spark plasma sintering (SPS) of spherical copper particles are investigated both experimentally and analytically. Experimentally measured densification rates are compared to expected contributions to densification coming from Coble creep, Nabarro-Herring creep, power-law creep, and pressure-assisted sintering described by the two-particle model. The results indicate densification by Coble creep or a low-temperature version of power-law creep in the investigated range of temperature and pressure at a relative density of 70%. The findings are supported by (i) activation energies obtained for various conditions using the Dorn-method as well as (ii) the pressure dependence of the densification rate.

中文翻译：

---

金属放电等离子烧结的基本原理：第三部分——塑性和蠕变致密化

摘要 通过实验和分析研究了球形铜颗粒放电等离子体烧结 (SPS) 过程中的致密化机制。实验测量的致密化率与 Coble 蠕变、Nabarro-Herring 蠕变、幂律蠕变和双粒子模型描述的压力辅助烧结对致密化的预期贡献进行了比较。结果表明，在所研究的温度和压力范围内，在 70% 的相对密度下，通过 Coble 蠕变或幂律蠕变的低温版本致密化。这些发现得到了 (i) 使用 Dorn 方法在各种条件下获得的活化能以及 (ii) 致密化速率的压力依赖性的支持。