Open AccessFinite‐difference calculation on an uncertainty evaluation of the kinetic parameters from initial sintering of UO 2
Author(s) -
Matsuda Tetsushi
Publication year - 2019
Publication title -
international journal of ceramic engineering and science
Language(s) - English
Resource type - Journals
ISSN - 2578-3270
DOI - 10.1002/ces2.10023
Subject(s) - sintering , shrinkage , materials science , particle (ecology) , diffusion , kinetic energy , range (aeronautics) , grain boundary diffusion coefficient , particle size , composite material , mechanics , grain boundary , thermodynamics , chemistry , physics , classical mechanics , microstructure , geology , oceanography
Computational simulation based on the one‐dimensional finite‐difference method was performed in order to clarify the effect of particle size and the coexistence of particles with different diameters on sintering kinetics of UO 2 . Particle arrays with different diameters were arranged in parallel, and sintering behavior, such as shrinkage and neck growth, was calculated by the finite‐difference method. The shrinkage of the particle array and the stress on the grain boundary were calculated in the linked sintering. The results indicated that evaluation of the activation energies for sintering of compacts of UO 2 seems likely to be possible by selecting an appropriate shrinkage range. However, evaluation of the diffusion coefficients using compacts is questionable.