Densification kinetics during isothermal sintering of 8YSZ. Issue 5 (April 2016)

• Record Type: Journal Article
• Authors: Kim, Byung-Nam; Suzuki, Tohru S.; Morita, Koji; Yoshida, Hidehiro; Sakka, Yoshio; Matsubara, Hideaki
• Is Part Of: Journal of the European Ceramic Society. Volume 36:Issue 5(2016:)
• Page Start: 1269
• Page End: 1275
• Publication Date: 2016-04
• Subjects: Densification -- Kinetics -- Grain growth -- Sintering -- Activation energy; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.11.041
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The densification behavior during the isothermal sintering of 8YSZ was examined in the initial and intermediate stages of sintering. In the initial stage, a difficulty in evaluating the densification behavior arises from the transition of the stable pore structure and the limitation of the theoretical two-sphere model. In the intermediate stage, a linear relationship with a slope of −1/2 is observed between the densification rate and the time. An empirical equation of the densification kinetics is proposed and found to be valid in a wide density range. At a relative density of 0.6–0.73, the activation energy is 688 kJ/mol. Rapid grain growth is observed at a relative density of 0.73–0.8 and >0.9 for the isothermal sintering at 1200–1300 °C and 1400–1500 °C, respectively. The rapid grain growth reduced significantly the densification rate. The densification mechanism and grain growth behavior are also discussed.