Sintering analysis of sub-micron-sized nickel powders: Kinetic Monte Carlo simulation verified by FIB-SEM reconstruction

JOURNAL OF POWER SOURCES

卷:276

Article

Hara, Shotaro^1,2  Ohi, Akihiro¹  Shikazono, Naoki^1,2 

[1] Univ Tokyo, Inst Ind Sci, Meguro Ku, Tokyo 1538505, Japan

[2] JST CREST, Chiyoda Ku, Tokyo 1020076, Japan

关键词: Solid oxide fuel cell;    Sintering;    Microstructure;    Nickel;    Monte Carlo simulation;    FIB-SEM;   

DOI  :  10.1016/j.jpowsour.2014.11.110

来源: Elsevier

【 摘 要 】

Since sintering of sub-micron-sized particles is a critical phenomenon affecting the electrochemical performance and reliability of solid oxide fuel cell systems, a better understanding of this microstructure-related process is of great importance. In this study, we show that kinetic Potts Monte Carlo modeling is capable of quantitatively predicting the three-dimensional (3D) microstructure evolution over an entire stage of nickel sintering at the sub-micron scale. This is achieved through direct comparison of simulation results and 3D microstructural analysis using focused ion beam scanning electron microscopy. We show that grain boundary diffusion is the dominant mechanism on densification, while surface diffusion has an impact on the coarsening during sub-micron scale sintering, only acting as one of the multiple mechanisms of sintering. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free