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Sintering and the Optical Properties of Mn3O4-added Al2O3

Mn3O4를 첨가한 Al2O3 세라믹스의 소결 및 광학 특성

  • Kim, Jin-Ho (School of Materials Science & Engineering, Kyungpook National University) ;
  • Baik, Seung-Woo (R&D Center, Maxtech Co., Ltd.)
  • 김진호 (경북대학교 신소재공학부) ;
  • 백승우 ((주) 멕테크 부설 기술연구소)
  • Received : 2016.07.25
  • Accepted : 2016.08.24
  • Published : 2016.09.01

Abstract

Alumina added with Mn3O4 up to 7.5 cat% of Mn was prepared by conventional ceramic processing, and the sintering behavior and the optical properties of which were studied as functions of Mn content. Densification and grain growth of alumina were enhanced by Mn addition up to 0.75 cat% but was leveled off at higher concentrations. XRD revealed that $Al_2MnO_4$(galaxite) was formed as a second phase in the specimens with more than 0.75 cat% of Mn. Thus it is believed that either the solid solution effect of Mn or the Zener effect of $Al_2MnO_4$ becomes predominant in the sintering of Mn-added $Al_2O_3$ according to the additive concentration. UV-VIS reflectivity(SCI) spectra of Mn-added $Al_2O_3$ consisted of smooth bottoms in 300~550 nm wavelength range and plateaus at wavelengths longer than 650 nm. The reflectivity spectrum continuously moved downward, and the specimen color became darker and thicker with increasing Mn content. The CIELAB color change with respect to standard white was also dependent on the amount of Mn added: ${\Delta}L^*$(D65) negatively increased and ${\Delta}E_{ab}^*$(D65) positively increased with increasing Mn content, probably due to Mn substitution to Al and/or the mixing effect of black $Al_2MnO_4$ as a second phase.

Acknowledgement

Supported by : 산업통상자원부, KNU

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