Non-uniform sintering behavior during spark plasma sintering of Y2O3

Ji Hwoan Lee, Byung Nam Kim, Byung Koog Jang

Research output: Contribution to journalArticle

Abstract

During spark plasma sintering of Y2O3 ceramics, the evolution of non-uniform microstructure was observed, depending on the heating rate. At low heating rates, the appearance of the sintered bodies is relatively uniform, and the grain size is slightly larger in the center than in the periphery. At high heating rates, however, the sintered bodies are apparently non-uniform to reveal opaque center and translucent periphery, and a difference in the grain size between the center and the periphery increases remarkably. The porosity and the pore size in the center also increase with holding time. The evolution mechanism of the non-uniform microstructure is explained by using a concept of dynamic grain growth and by assuming defect diffusion from the periphery to the center under complicated electric and magnetic fields during spark plasma sintering.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - Jan 1 2019

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Spark plasma sintering
Heating rate
Sintering
Microstructure
Grain growth
Pore size
Porosity
Electric fields
Magnetic fields
Defects

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Non-uniform sintering behavior during spark plasma sintering of Y2O3 . / Lee, Ji Hwoan; Kim, Byung Nam; Jang, Byung Koog.

In: Ceramics International, 01.01.2019.

Research output: Contribution to journalArticle

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AB - During spark plasma sintering of Y2O3 ceramics, the evolution of non-uniform microstructure was observed, depending on the heating rate. At low heating rates, the appearance of the sintered bodies is relatively uniform, and the grain size is slightly larger in the center than in the periphery. At high heating rates, however, the sintered bodies are apparently non-uniform to reveal opaque center and translucent periphery, and a difference in the grain size between the center and the periphery increases remarkably. The porosity and the pore size in the center also increase with holding time. The evolution mechanism of the non-uniform microstructure is explained by using a concept of dynamic grain growth and by assuming defect diffusion from the periphery to the center under complicated electric and magnetic fields during spark plasma sintering.

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