| 液相烧结过程中粉末粒径分布演化模拟研究 |
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| 引用本文： | 潘诗琰,代文杰,周子豪,蒋捷,霍天元,申小平,范沧.液相烧结过程中粉末粒径分布演化模拟研究[J].粉末冶金技术,2018,36(6):409. |
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| 作者姓名： | 潘诗琰 代文杰 周子豪 蒋捷 霍天元 申小平 范沧 |
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| 作者单位： | 1.南京理工大学材料科学与工程学院，南京 210094 |
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| 基金项目： | 国家自然科学基金资助项目51501091 |
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| 摘 要： | 液相烧结过程中, 粉末颗粒的熟化长大和聚并同时发生。利用群体平衡模型定量预测了相邻颗粒聚并效应作用下的粒径分布演化规律, 提出了一种基于欧式范数的方法以确定液相烧结过程是否达到稳态, 研究了从瞬态到稳态的转变过程中的粒径上限及其变化率, 发现颗粒瞬态粗化之后将得到稳态粒径分布。模型计算得到的粒径分布和实验数据之间吻合良好, 表明本数值模型具备定量预测能力。通过引入布朗粗化频率描述液相烧结过程中的聚并现象, 模拟结果表明颗粒的聚并行为显著延缓了瞬态向稳态的转变过程, 甚至可能导致最终得到非稳态粒径分布。
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| 关 键 词： | 液相烧结 群体平衡方程 粒径分布 聚并 |
| 收稿时间： | 2018-05-13 |
Simulation study on size distribution evolution of powder particles in liquid phase sintering |
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| Affiliation: | 1.School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China2.Engineering Training Center, Nanjing University of Science and Technology, Nanjing 210094, China |
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| Abstract: | The Ostwald ripening and aggregation of neighboring particles occur simultaneously during liquid phase sintering (LPS). A population balance equation was applied to predict the evolution of particle size distribution in aggregation effect during LPS process, a method based on the Euclidean norm was proposed to determine the steady state of particle size distribution in LPS, and the proposed model was applied to predict the upper limit and change rate of particle size during the transition from transient to steady-state. It is found that the particle size distribution reaches a steady-state after the transient coarsening. The modeling and the experimental data reported in literature show good agreement, demonstrating the reliable quantitative prediction by the present numerical model. The present model was adopted to study the particle aggregation by taking Brownian motion into account during LPS. It is also found that the aggregation obviously retards the transition from transient to steady-state, and may even lead to an unsteady-state particle size distribution. |
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