한국세라믹학회지 (Journal of the Korean Ceramic Society)

  • 제39권2호
  • /
  • Pages.153-158
  • /
  • 2002
  • /
  • 1229-7801(pISSN)
  • /
  • 2234-0491(eISSN)
한국세라믹학회 (The Korean Ceramic Society)
권호 표지
DOI QR코드

DOI QR Code

습식법에 의한 Al2O3-TiO2 복합체의 합성 및 특성연구 I. Al2O3-TiO2 복합체의 기계적 특성(2)

Study on Properties of Al2O3-TiO2 Composites by Wet Method I. Mechanical Properties of Al2O3-TiO2 Composites(2)

  • 류수착 (밀양대학교 재료공학과)
  • Ryu, Su-Chak (Department of Materials Engineering, Miryang National University)
  • 발행 : 2002.01.01
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

습식법에 의하여 제조된 $Al_2O_3$-1∼11 wt% $TiO_2$계 복합체를 1350$^{\circ}C$, 1450$^{\circ}C$ 에서 2시간 열처리 한 후 이에 대한 기계적 물성변화 및 미세구조를 조사하였다. 그 결과, $TiO_2$ 첨가량이 3 wt%였을 때의 복합체가 bulk density도 높고 기공율도 낮은 치밀한 미세구조를 이루었으며 이 때 young's modulus는 35.5 GPa, 곡강도값은 68.7 MPa로서 다른 $TiO_2$ 첨가량에 비하여 우수한 물성을 나타내었다. $TiO_2$ 첨가량이 증가할 수록 많은 양의 aluminium titanate의 합성으로 인해 열팽창 계수는 낮은 값을 나타내었다.

$Al_2O_3$ composites powders with 1∼11 wt% $TiO_2$ were prepared by wet method and sintered at 1350$^{\circ}C$, 1450$^{\circ}C$ for 2h. Mechanical properties and microstructural evolution were investigated in this study. $Al_2O_3$-3 wt% $TiO_2$ composite were high bulk density of 2.37 g/$cm^3$ and low apparent porosity of 6.3%. The composites containing of 3 wt% $TiO_2$ showed moderately high bending strength of 68.9 MPa and the young's modulus of 35.5 MPa. The composites with increasing $TiO_2$ contents exhibit reduced thermal expansion coefficient due to the formation of $Al_2TiO_5$ phase.

키워드

참고문헌

  1. R. W. Cahn, P. Haasen and E. J. Kramer, 'Structure and Properties of Ceramics,' Materials Science and Technology, II, 528-530 (1994)
  2. L. J. Kim, H. B. Lee and Y. S. Ko, 'Aluminium TitanatePart 2,' J. Kor. Ceram. Soc., 10(1), 68-75 (1995)
  3. B. Freudenberg and A. Mocellin, 'Aluminium Titanate Formation by Solid-state Reaction of Fine Al$_{2}$O$_{3}$ and TiO$_{2}$ Powders,' J. Am. Ceram. Soc., 70(1), 33-38 (1987) https://doi.org/10.1111/j.1151-2916.1987.tb04849.x
  4. B. Freudenberg and A. Mocellin, 'Aluminium Titanate Formation by Solid-state Reaction of Coarse Al$_{2}$O$_{3}$ 3 and TiO$_{2}$ Powders,' J. Am. Ceram. Soc., 71(1), 22-28 (1988) https://doi.org/10.1111/j.1151-2916.1988.tb05755.x
  5. H. L. Lee and H. S. Lee, 'A Study on the Preparation of Al$_{2}$O$_{3}$-TiO$_{2}$ Nanocomposite Powders,' J. Kor. Ceram. Soc., 30(2), 115-122 (1993)
  6. W. F. Kladnig and H. Mayer, 'Aluminium Titanate Formation by the Gas-phase Hydropyrolysis Method,' J. Mater. Sci., 25, 1973-1977 (1990) https://doi.org/10.1007/BF01045751
  7. S. C. Ryu and J. Y. Um, 'Synthesis and Properties of Al$_{2}$O$_{3}$-TiO$_{2}$ Composites by Wet Method, 1. Synthesis of Al$_{2}$O$_{3}$-TiO$_{2}$ Composite Powders (1),' J. Kor. Ceram. Soc., 38(5), 412-417 (2001)
  8. H. A. J. Thomas and R. Stevens, 'Aluminium Titanate-A Literature Review, Part 2: Engineering Properties and Thermal Stability,' Br. Ceram. Soc., 184-190 (1989)
  9. Y. Ohya, K. Hamano and Z. Nakagawa, 'Effects of some Additives on Microstructure and Bending Strength of Aluminium Titanate Ceramics,' J. Am. Ceram. Soc., 70(8), 184-186 (1987)