Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지

Role of CaO in the Sintering of 12Ce-TZP Ceramics

12Ce-TZP 세라믹스의 소결에서의 CaO의 역할

  • Published : 1992.04.01

⟨ Previous Next ⟩

Abstract

Role of CaO in the sintering of 12Ce-TZP ceramics was studied. The addition of small amounts of CaO increase the densification rate of 12Ce-TZP by altering lattice defect structure and the diffusion coefficient of the rate controlling species, namely cerium and zirconium cations. CaO also inhibits grain growth during sintering and allows the sintering process to proceed to theoretical density by maintaining a high diffusion flux of vacancies from the pores to the grain boundaries. The inhibition of grain growth is accomplished by the segregation of solute at the grain boundaries, causing a decrease in the grain boundary mobility. The segregation of calcium was revealed by AES study.

12Ce-TZP의 소결에 미치는 CaO의 역할에 대하여 연구하였다. CaO의 첨가는 Ce-TZP의 격자결함구조와 확산의 율속종인 cerium과 zirconium 이온의 확산계수를 변화시켜 치밀화를 촉진시킨다. CaO는 또한 소결과정중 결정립 성장을 억제하며, 이는 소결과정중 임계 이동시 입계로부터의 기공의 분리를 방지함과 동시에 기공으로부터 입계로의 공격자의 빠른 확산을 유지시킴으로써 이론밀도까지의 소결을 가능하게 한다. Ce-TZP의 결정립 성장 억제는 calcium의 입계편석에 의한 입계 이동도의 감소에 의하며, calcium의 입계편석을 AES 분석으로 확인하였다.

Keywords

References

  1. Proceedings of the international conferance Zirconia 88-Advances in Zirconia Science and Technology Sintering Aids for Ce-TZP S. Maschio;E. Bischoff;O. Shaizero;S. Meriani;S. Meriani(ed.);C. Palmonari(ed.)
  2. Sprechsaal v.122 no.4 Sintering Behavior and Anti-Degradation Properties of MOx-Doped Y-TZP(M: Cu, Mn, Co, Ni, Zn) N. Kiumra;S. Abe;Y. Hayashi;J. morishita;H. Okamura
  3. J. Am. Ceram. Soc. v.69 no.4 Lattice Parameters and Density for Y₂O₃-Stabilized ZrO₂ R.P. Ingel;D. LewisⅢ
  4. Trans Br. Ceram. Soc v.69 no.2 Effects of Additions of MgO, ZnO and NiO on Grain Growth in Dense Alumina N.A. Haroun;D.W. Budworth
  5. Trans. J. Ceram. Soc v.82 Sintering Additives for Zirconia Ceramics S. Wu;R.J. Brook
  6. Advances in Ceramics v.3 Study of Electronic Minority Defects in Stabilized Zirconia by Thermal Emission of Electrons P. Odier;J.P. Loup;A.H. Heuer(ed.);L.W. Hobbs(ed.)
  7. Acta Met. v.14 A Model for Connectivity in Multiphase Structures J.W. Cahn
  8. Mat. Sci. Res. v.13 Effect of MgO on the Mobility of Grain Boundaries and Pores in Aluminum Oxide; Sintering Processes J.E. Burke;K.W. Lay;S.Prochazka
  9. J. Am. Ceram. Soc. v.72 no.2 Effect of MgO addition on the Microstructure Development of 3 mol% Y₂O₃-ZrO₃ H.Y. Lu;J.S. Bow
  10. Ceramic Microstructures'76 The Effect of Pore Drag on Ceramic Microstructures F.M.A. CarpayR.M. Fulrath(ed.);J.A. Pask(ed.)
  11. Ceramic Microstructures'76 Grain Bounndary Migration in Ceramics F.M. Yan;R.M. Cannon;H.K. Bowen
  12. Scripta Met. v.2 no.7 The Impurity Drag Effect and Grain Growth Kinetics R.J. Brook
  13. Acta. Met. v.10 The Impurity - Dran Effect and Grain Boundary Motion J.W. Cahn
  14. J. Am. Ceram. Soc. v.47 no.7 Role of Solute Segregation at Grain Boundaries During Final-Stage Sintering of Alumina P.J. Jorgensen;J.H. Westbrook
  15. J. Am. Ceram. Soc. v.50 no.11 Grain Boundary Segregation and Final-Stage Sintering of Y₂O₃ P.J. Jorgensen;R.C. Anderson
  16. Mat. Sci. & Eng. v.48 Microstructural Control of Processing of Electronic Ceramics M.F. Yan