Atomistic investigation of pressure effects on sintering of bimetallic core-shell nanoparticles  

作　　者：Juheon Kim Hayoung Chung 

机构地区：[1]Department of Mechanical Engineering,Ulsan National Institute of Science and Technology,50 Unist-gil,Ulsan 44919,South Korea

出　　处：《Journal of Materials Science & Technology》2024年第17期64-74,共11页材料科学技术（英文版）

基　　金：supported by National R&D Program through the National Research Foundation of Korea(NRF)funded by Ministry of Science and ICT(Nos.NRF-2020R1C1C1005741,NRF-2021R1A4A1033224);the National Research Foundation of Korea(NRF)grant funded by the Korea government(MSIT)(No.RS-2023-00257666);the Human Resources Development of the Korea Insitute of Energy Technology Evaluation and Planning(KETEP)grant funded by the Korea government Ministry of Knowledge Economy(No.RS-2023-00240918);regional specialized industry development program funded by Ministry of SMEs and Startups(S3365135);supported by Samsung Electronics Co.,Ltd(No.IO221007-02753-01).

摘　　要：Pressure-assisted sintering(PAS)utilizing bimetallic core-shell nanoparticles(CS NPs)has garnered widespread attention for its ability to produce advanced components with excellent thermal and elec-trical conductivities,even at low temperatures.This study presents the first investigation into the PAS of bimetallic CS NPs,using Ag-coated Cu material as a representative system,through all-atom molecu-lar dynamics(MD)simulations.The study provides detailed insights into the atomic-scale processes and mechanisms that govern pressure-assisted sintering,elucidating the coalescence phenomena and reveal-ing the significant influence of external pressure.By comparing atomistic behaviors,such as diffusion,migration,and microstructure evolution,between PAS and thermal sintering,a deeper understanding of the underlying mechanisms is achieved.Furthermore,the results highlight the importance of considering microstructural characteristics in addition to void fraction assessment for accurately estimating mechani-cal properties.This study enhances our understanding of sintering methods and offers a new perspective on designing process conditions in the PAS process.

关 键 词：Core-shell nanoparticles Pressure-assisted sintering Molecular dynamics simulation Many-particle model Microstructure Mechanical properties 

分 类 号：TG146.21[一般工业技术—材料科学与工程]