基于分子动力学粉末涂层型电极箔烧结行为模拟  

Simulation of sintering behavior of electrode foil based on molecular dynamics powder coating

作　　者：孟庆玉 黄勇 董晓红 李豪人 MENG Qingyu;HUANG Yong;DONG Xiaohong;LI Haoren(College of Mechanical and Electrical Engineering,Xinjiang Agricultural University,Urumqi830052,China;College of Mechanical and Electrical Engineering,Xinjiang Institute of Engineering,Urumqi830023,China)

机构地区：[1]新疆农业大学机电工程学院,新疆乌鲁木齐830052 [2]新疆工程学院机电工程学院,新疆乌鲁木齐830023

出　　处：《电子元件与材料》2023年第8期955-960,共6页Electronic Components And Materials

基　　金：新疆维吾尔自治区自然科学基金资助项目(2022D01A50);新疆工程学院产教融合横向课题(2022xgyh22503);新疆维吾尔自治区科协青年人才托举工程项目(RCTJ46)。

摘　　要：粉末涂层型电极箔是通过在铝箔表面涂覆烧结铝粉颗粒,构造三维立体孔隙结构,以增加电极箔与电解液的有效接触面积,提高铝电解电容器电容量。为定量控制粉末涂层型电极箔有效表面积,精确提升铝电解电容器电容量,基于分子动力学计算模块对不同温度下的原子扩散进行了模拟,使之与传统烧结模型相结合,对烧结式阳极箔铝粉颗粒烧结颈的生长速率进行了预测,预测结果表明,500 K温度下3μm粒径铝粉在烧结初期第1 s烧结颈约长大0.17μm。同时将理论烧结与实际烧结状态进行对比,分析出现这种差异可能存在的原因,为后续烧结箔有效表面积的增加以及烧结状态的精确控制提供一种新思路。The powder-coated electrode foil is created by coating sintered aluminum powder particles on the surface of aluminum foil,constructing a three-dimensional porous structure to increase the effective contact area between the electrode and electrolyte,and increase the capacitance of the aluminum electrolytic capacitor.With the intention of quantitatively controlling the effective surface area of the powder-coated electrode foil and accurately improving the capacitance of the aluminum electrolytic capacitor,molecular dynamics simulations were employed to model atomic diffusion at different temperatures,combined with traditional sintering models to predict the growth rate of the sintered neck of the aluminum powder particles on the anode foil.The results show that at a temperature of 500 K and with a 3μm particle size,the sintered neck grows by approximately 0.17μm in the first second of sintering.Simultaneously,theoretical sintering was compared with actual sintering,and the possible reasons for the differences were analyzed,providing a new approach for increasing the effective surface area of the sintered foil and accurately controlling the sintering process.

关 键 词：电极箔 分子动力学 烧结模型 烧结颈 

分 类 号：TM53[电气工程—电器] TG292[金属学及工艺—铸造]