한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제49권6호
  • /
  • Pages.608-613
  • /
  • 2012
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지
DOI QR코드

DOI QR Code

고압 환경에서 소결 온도에 따른 MgO 물성의 변화

Property of MgO with Different Sintering Temperatures under High Pressures

  • 송정호 (서울시립대학교 신소재공학과) ;
  • 노윤영 (서울시립대학교 신소재공학과) ;
  • 송오성 (서울시립대학교 신소재공학과)
  • Song, Jeongho (Department of Materials Science and Engineering, University of Seoul) ;
  • Noh, Yunyoung (Department of Materials Science and Engineering, University of Seoul) ;
  • Song, Ohsung (Department of Materials Science and Engineering, University of Seoul)
  • 투고 : 2012.08.07
  • 심사 : 2012.09.07
  • 발행 : 2012.11.30
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

We investigated the property changes of MgO powders sintered at temperatures ranging from $700^{\circ}C$ to $1900^{\circ}C$ for 5minutes at a pressure of 2.7 GPa for a high-pressure high-temperature(HPHT) diamond synthesis process. The physical properties of the sintered MgO powders were characterized by optical microscopy, field emission scanning electron microscopy (FE-SEM), Vickers hardness tests, and by the apparent density, and X-ray diffractometry. An optical micro-analysis showed that white MgO powders became black after sintering due to carbon contamination from the graphite heat source. FE-SEM revealed the growth in the grain size of the MgO powders from $0.3{\mu}m$ to $50{\mu}m$ after sintering at $1700^{\circ}C$. The hardness and apparent density increased to $1800^{\circ}C$ while the samples were dedensified at $1900^{\circ}C$ due to the growth of isolated pores. According to the XRD analysis, no phase transformation occurred in the MgO powders. These results suggest that HPHT-sintered MgO powders can show an accelerated sintering process characterized by grain neck growth, pore connections, isolated pore growth and dedensification in 5 minutes, while these processes with the conventional sintering process take at least 5 hours.

키워드

참고문헌

  1. R. W. Davidge, "Mechanical Behaviour of Ceramics," pp. 71-92, Cambridge University Press, Cambridge, 1980.
  2. R. M. Fulrath and J. A. Pask, "Effect of Microstructure on Deformation of Ceramics. In Ceramic Microstructures," pp. 406, Wiley Publishing, New York, 1968.
  3. Y. B. Lee, J. H. Lee, H. C. Park, and K. D. Oh, "Influence of $ZrO_2$ on Microstructure and Mechanical Strength of Sintered Magnesia," J. Kor. Ceram. Soc., 31 [9] 1053-59 (1994).
  4. Y. B. Lee, H. C. Park, and K. D. Oh, "Influence of $TiO_2$ on Sintering and Microstructure of Magnesia," J. Kor. Ceram. Soc., 31 [5] 471-76 (1994).
  5. J. H. Song and O. S. Song, "Color Enhancement of the TypeII and Type I aB Brown Diamonds into Colorless by HPHT Process," J. Kor. Ceram. Soc., 49 [3] 221-25 (2012). https://doi.org/10.4191/kcers.2012.49.3.221
  6. S. Zhang, N. J. Marriott, and W. E. Lee, "Thermochemistry and Microstructures of MgO-C Refractories Containing Various Antioxidants," J. Eur. Ceram. Soc., 21 1037-47 (2001). https://doi.org/10.1016/S0955-2219(00)00308-3
  7. Y. Kono, T. Irifune, Y. Higo, T. Inoue, and A. Barnhoorn, "PV-T Relation of MgO Derived by Simultaneous Elastic Wave Velocity and in Situ X-ray Measurements: A New Pressure Scale for the Mantle Transition Region," Phys. Earth Planetary Inter., 183 [1-2] 196-211 (2010). https://doi.org/10.1016/j.pepi.2010.03.010
  8. D. Ehre, E. Y. Gutmanas, and R. Chaim, "Densification of Nanocrystalline MgO Ceramics by Hot-pressing," J. Eur. Ceram. Soc., 25 [16] 3579-85 (2005). https://doi.org/10.1016/j.jeurceramsoc.2004.09.023
  9. A. G. Evans and R. W. Davidge, "The Strength and Fracture of Fully Dense Polycrystalline Magnesium Oxide," Philos. Mag., 20 [164] 373-88 (1969). https://doi.org/10.1080/14786436908228708
  10. James S. Reed, "Principles of Ceramics Processing : Second edition," pp. 118-21, John Wiley & Sons, INC., NY, 1995.
  11. R. L. Coble, "Sintering Crystalline Solids, I. Intermediate and Final Diffusion Models," J. Appl. Phys., 32 [5] 787-92 (1950).
  12. D. H. Park, B. C. Kim, J. J. Kim, and L. S. Park, "Effects of Glass Particle Size on Sintering Behaviors of the Glass- Alumina Composites for Low Firing Temperature," J. Kor. Ceram. Soc., 37 [6] 545-51 (2000).
  13. A. B. Belonoshko, S. Arapan, R. Martonak, and A. Rosengren, "MgO Phase Diagram from First Principles in a Wide Pressure-Temperature Range," Phys. Rev. B, 81 154110-1-8 (2010).

피인용 문헌

  1. Properties of CaO added MgO Sintering at High Pressure and Low Temperatures vol.14, pp.9, 2013, https://doi.org/10.5762/KAIS.2013.14.9.4185
  2. 초고압을 이용한 나노급 마그네시아 분말의 저온 소결 연구 vol.50, pp.3, 2012, https://doi.org/10.4191/kcers.2013.50.3.226