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Effect of Co₂O₃ addition on liquid phase sintering behavior and mechanical properties of commercial alumina

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2020, 30(4), pp.150-155
  • DOI : 10.6111/JKCGCT.2020.30.4.150
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : June 19, 2020
  • Accepted : July 20, 2020
  • Published : August 31, 2020

Oh BokHyun 1,  Tae-Gyu Yoon 2,  Heon Kong 3,  Nam-Il Kim 3,  Lee Sang-Jin 1

1목포대학교
2(주)대경셈코
3목포대학교 세라믹산업기술연구소

Accredited

ABSTRACT

Alumina (Al₂O₃) is mainly used as a structural ceramic material and to have good mechanical properties requires a dense microstructure. In commercial fabrication, the liquid phase sintering process is adjusted to reduce the sintering temperature of alumina. In this study, the effect of added amounts of cobalt oxide as a coloring agent on the microstructureand mechanical properties was investigated in the CaO-SiO₂-MgO-system liquid phase sintering of 92 % alumina at various sintering temperatures. When 11 wt% Co₂O₃ was added, a rearrangement of alumina particles, which is the main densification step in liquid phase sintering, occurred from a sintering temperature of 1200°C. Solution re-precipitation and coalescence steps followed from 1300°C with the grain growth of alumina particles. The addition of excess Co₂O₃ and sintering temperatures above 1400°C resulted in a decrease in sintered density and Vickers hardness, because of the low viscosity of the liquid phase. In 92 % alumina with the addition of 11 wt% Co₂O₃, a sintered density and Vickers hardness of 3.86 g/cm³ and 12.32 GPa, respectively, were obtained at a sintering temperature of 1350°C.

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