Simulation of densification behavior of nano-powder in final sintering stage: Effect of pore-size distribution

Byung Nam Kim, Koji Morita, Tohru S. Suzuki, Ji Guang Li, Hideaki Matsubara

Research output: Contribution to journalArticle

Abstract

In the final sintering stage, nano-sized powder frequently forms a pore structure where most pores are surrounded by more than 5 grains. The pore structure is different from that of coarse powder. In this study, the densification behavior of nano-sized powder is modelled and simulated in the final sintering stage. The porous body has the initial size distribution of pores, represented as a Weibull function. The mechanical interaction between pores is analyzed to simulate the evolution of porosity characteristics as well as densification kinetics. The densification rate for the size-distributed pores is lower than that for single-sized ones. The experimental relationship between the densification rate and the porosity could well be reproduced by choosing appropriate pore-size distributions. The simulation also shows that the sintering stress with densification may increase or decrease depending on the size distribution, but is remarkably lower than that for single-sized pores.

Original languageEnglish
JournalJournal of the European Ceramic Society
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • Densification kinetics: pore-size distribution
  • Porosity
  • Simulation
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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