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Title: Towards understanding particle rigid-body motion during solid-state sintering

Journal Article · · Journal of the European Ceramic Society

A quantitative understanding of particle rigid body (RB) motion that inherently accompanies grain boundary (GB) diffusion is highly desirable to understand and control the dynamic interplay between coarsening and densification during solid state sintering. In this work, by computer simulation using a multi-phase-field approach, we analyze systematically the roles played by each of these processes at different stages of the shrinkage of the internal pore in a three-particle green body as a function of particle size as well as thermodynamic and kinetic factors of interfaces. We demonstrate that particle RB translation promotes both neck growth, and pore rounding and shrinkage. Moreover, the forces acting at GBs and pulling neighboring particles towards one another dynamically evolve as particles fuse. In contrast, particle RB rotation has no contribution to pore shrinkage. The translational force acting on an individual particle varies with not only its size, but also the number and sizes of its neighboring particles.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Transportation Office. Vehicle Technologies Office
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1831396
Report Number(s):
LLNL-JRNL--820428; 1031977
Journal Information:
Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 16 Vol. 41; ISSN 0955-2219
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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