氮化硼陶瓷坯体片状颗粒随机堆积的离散元模拟研究

doi:10.16552/j.cnki.issn1001-1625.2025.0040

硅酸盐通报 ›› 2025, Vol. 44 ›› Issue (8): 2965-2976.DOI: 10.16552/j.cnki.issn1001-1625.2025.0040

氮化硼陶瓷坯体片状颗粒随机堆积的离散元模拟研究

叶文康¹, 齐正², 叶艳丽¹, 何子君³, 梅书霞¹, 谢峻林⁴

1.武汉理工大学材料科学与工程学院,武汉 430070;
2.中国钢研科技集团有限公司,北京 100081;
3.钢铁研究总院有限公司功能材料研究院,北京 100081;
4.北京工业大学材料循环低碳再生全国重点实验室,北京 100124

收稿日期:2025-01-08 修订日期:2025-02-14 出版日期:2025-08-15 发布日期:2025-08-22
通信作者: 谢峻林,博士,教授。E-mail:xjl09532@bjut.edu.cn齐正,博士,高级工程师。E-mail:zheng_qi_cn@outlook.com
作者简介:叶文康(2000—),男,硕士研究生。主要从事氮化硼陶瓷方面的研究。E-mail:kangwenyewhut@163.com
基金资助:
钢研总院自主投入项目资助(24020620ZD);中国钢研科技集团青创基金资助(KNRCPY-JT00-23013)

Discrete Element Simulation of Random Packing of Flake Particles in Boron Nitride Ceramic Green Body

YE Wenkang¹, QI Zheng², YE Yanli¹, HE Zijun³, MEI Shuxia¹, XIE Junlin⁴

1. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China;
2. China Iron and Steel Research Institute Group, Beijing 100081, China;
3. Division of Functional Material, Central Iron & Steel Research Institute, Beijing 100081, China;
4. State Key Laboratory of Materials Low-Carbon Recycling, Beijing University of Technology, Beijing 100124, China

Received:2025-01-08 Revised:2025-02-14 Published:2025-08-15 Online:2025-08-22

摘要/Abstract

摘要： 六方氮化硼(h-BN)陶瓷因层状结构和优异的定向导热性能,在航空航天等领域具有重要应用价值。本研究通过离散元方法(DEM)分析了颗粒尺寸、径厚比和外加轴向压力对片状颗粒堆积结构的影响。结果表明,大尺寸颗粒、大径厚比和外加轴向压力均能促进颗粒有序排列,优化取向。外加轴向压力和大尺寸颗粒有助于颗粒间的接触,增加配位数,降低孔隙率,而增大径厚比则会使孔隙率上升。颗粒厚度从5 μm增加到20 μm,整体堆积孔隙率从0.65降至0.57,平均配位数从2.56升至4.43,平均取向角从45.30°降至10.70°。径厚比从20增至100时,孔隙率从0.65升至0.76,平均颗粒取向角从45.30°变为12.74°。当外加7 MPa轴向压力时,整体堆积孔隙率下降0.15～0.16,平均配位数增加1.57～2.40,平均颗粒取向角下降7.19°～12.03°。本研究为h-BN陶瓷热压烧结的堆积工艺优化提供了理论参考。

关键词: 片状颗粒, 颗粒随机堆积, 内聚力, 孔隙率, 颗粒取向

Abstract: Hexagonal boron nitride (h-BN) ceramics have important application value in aerospace and other fields due to their layered structure and excellent directional thermal conductivity. In this study, the effects of particle size, aspect ratio and external axial pressure on the packing structure of flake particles were analyzed by discrete element method (DEM). The results show that large size particles, large aspect ratio and external axial pressure can promote the orderly arrangement of particles and optimize the orientation. The external axial pressure and large particles contribute to the contact between particles, increase the coordination number and reduce the porosity, while increasing the aspect ratio will increase the porosity. The thickness of the particles increases from 5 μm to 20 μm, the overall packing porosity decreases from 0.65 to 0.57, the average coordination number increases from 2.56 to 4.43, and the average orientation angle decreases from 45.30° to 10.70°. When the aspect ratio increases from 20 to 100, the porosity increases from 0.65 to 0.76, and the average particle orientation angle changes from 45.30° to 12.74°. When the external axial pressure is 7 MPa, the overall packing porosity decreases by 0.15~0.16, the average coordination number increases by 1.57~2.40, and the average particle orientation angle decreases by 7.19°~12.03°. This study provides a theoretical reference for the optimization of the packing process of h-BN ceramic hot pressing sintering.

Key words: flake particle, particle random packing, cohesive force, porosity, particle orientation

中图分类号:

TQ110.2

叶文康, 齐正, 叶艳丽, 何子君, 梅书霞, 谢峻林. 氮化硼陶瓷坯体片状颗粒随机堆积的离散元模拟研究[J]. 硅酸盐通报, 2025, 44(8): 2965-2976.

YE Wenkang, QI Zheng, YE Yanli, HE Zijun, MEI Shuxia, XIE Junlin. Discrete Element Simulation of Random Packing of Flake Particles in Boron Nitride Ceramic Green Body[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(8): 2965-2976.

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氮化硼陶瓷坯体片状颗粒随机堆积的离散元模拟研究

Discrete Element Simulation of Random Packing of Flake Particles in Boron Nitride Ceramic Green Body

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