Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
권호 표지
DOI QR코드

DOI QR Code

Influence of Alumina Slurry Composition on Mechanical Properties of Green Tapes

알루미나 슬러리 조성에 따른 그린 테이프의 기계적 특성

  • Lee, Myung-Hyun (Advanced Material Analysis and Evaluation Team, Korea Institute of Ceramic Engineering and Technology) ;
  • Park, Il-Seok (Material Research Division, Korea Institute of Science and Technology) ;
  • Kim, Dae-Joon (Material Research Division, Korea Institute of Science and Technology) ;
  • Lee, Deuk-Yong (Department of Materials Engineering, Daelim College of Technology)
  • 이명현 (요업(세라믹)기술원 신소재분석평가팀) ;
  • 박일석 (한국과학기술연구원 재료연구부) ;
  • 김대준 (한국과학기술연구원 재료연구부) ;
  • 이득용 (대림대학 재료정보공학과)
  • Published : 2002.01.01
Download PDF
⟨ Previous Next ⟩

Abstract

Alumina slurriers, having various amount of alumina and ratio of organic additives, were prepared for tape casting. The relative viscosities were compared to investigate influence of composition on stability of the slurry and plotted as a function of powder fraction. They raised with increasing powder fraction of slurries, revealing a exponential function curve, which means that stability of slurry was not affected by amount and composition of organic additives. Cast green tapes were tested under tensile condition at room temperature. The increase in alumina ratio and binder ratio was found to decrease strain to failure of green tapes from 363% to 45% and from 68% to 25%, respectively. Tensile strength of green tapes increased abruptly with increasing alumina ratio, which showed its maximum at 1 MPa. On other hand, Tensile strength increased continuously from 0.5 MPa to 4 MPa with increasing binder ratio. Mechanical properties of them were affected seriously and lost their properties by elevating temperature from 20$^{\circ}C$ to 80$^{\circ}C$.

알루미나 함량비와 유기물의 첨가비를 변화시킨 각 조성의 알루미나 테이프를 제조하였다. 유기첨가물 조성이 알루미나 슬러리의 안정성에 미치는 영향을 확인하기 위해 각 조성의 슬러리에 대하여 상대점도를 측정하였다. 여러 조성 슬러리의 상대점도를 알루미나 부피분율의 함수로 나타내었을 때 동일한 곡선 상에 위치하였으며, 이로부터 유기물의 함량 및 조성이 캐스팅용 슬러리의 안정성에 큰 영향을 미치지 않음을 알 수 있었다. 준비된 각 조성의 슬러리를 성형하여 건조한 그린 테이프들을 상온에서 인장시험한 결과, 파괴변형율은 알루미나 함량비와 결합제 첨가비가 증가함에 따라 각각 363%에서 45%로, 68%에서 25%로, 연속적으로 감소하는 경향을 나타내었으나, 인장강도는 결합제의 첨가비가 증가함에 따라서는 0.5MPa에서 4MPa로 연속적으로 증가하는 경향을, 알루미나 함량비가 증가함에 따라서는 1MPa까지 급격히 증가한 후 감소하는 변화를 나타내었다. 그린 테이프들은 20$^{\circ}C$에서부터 80$^{\circ}C$까지 승온한 조건에서 인장하였을 때 유기물의 열화로 인해 기계적 물성이 급격히 저하되었다.

Keywords

References

  1. S. Forte, J. R. Morris, Jr. and W. R. Cannon, 'Strength of Tape Casting Tapes,' Am. Ceram. Soc. Bull., 64 [5] 724-25 (1985)
  2. E. Streicher, T. Chartier and P. Boch, 'Influence of Organic Components on Properties of Tape-cast Aluminum Nitride Substrates,' Ceram. Int., 16 247-52 (1990) https://doi.org/10.1016/0272-8842(90)90073-O
  3. R. A. Gardner and R. W. Nufer, 'Properties of Multilayer Ceramic Green Sheets,' Solid State Technology, 5 38-43 (1974)
  4. A. Karas, T. Kumagai and W. R. Cannon, 'Casting Behavior and Tensile Strength of Cast $BaTiO_3$, Tape,' Adv. Ceram. Mater., 3 [4] 374-77 (1988) https://doi.org/10.1111/j.1551-2916.1988.tb00237.x
  5. B.-H. Ryu, M. Takahasi and S. Suzuki, 'Effect of Added Organics on Mechanical Properties of Alumina Green Sheets Prepared by Doctor Blade Method,' J. Ceram. Soc. Jpn., 100 [4] 422-25 (1992) https://doi.org/10.2109/jcersj.100.422
  6. M. Descamps, G. Ringuet, D. Legerm and B. Thierry, 'Tape-casting : Relation Between Organic Constituents and the Physical and Mechanical Properties of Tapes,' J. Eur. Ceram. Soc., 15 357-62 (1995) https://doi.org/10.1016/0955-2219(95)90360-U
  7. N. M. Sammes and R. Ratnaraj, 'New Process for Fabricating Interconnect Plate for a Planar Solid Oxide Fuel Cell,' J. Mater. Sci. Lett., 13 678-79 (1994) https://doi.org/10.1007/BF00271232
  8. K. P. Plucknett, C. H. Careres, C. Hughes and D. S. Wilkinson, 'Processing of Tape-cast Laminates Prepared from Fine Alumina/Zirconia Powders,' J. Am. Ceram. Soc., 77 [8] 2145-53 (1994) https://doi.org/10.1111/j.1151-2916.1994.tb07110.x
  9. D.-J. Kim, M.-H. Lee and C.-E. Kim, 'Mechanical Properties of Tape Cast Alumina-glass Dental Composites,' J. Am. Ceram. Soc., 82 [11] 3167-72 (1999) https://doi.org/10.1111/j.1151-2916.1999.tb02219.x
  10. K. Otsuka, Y. Ohsawa, K. Yamada and Sekibata, 'A Study on the Alumina Ceramics Casting Conditions by the DoctorBlade Method and Their Effect on the Properties of Green Tape(Part),' Yogyo-Kyokai-Shi, 94 [3] 351-59 (1986) https://doi.org/10.2109/jcersj1950.94.1087_351
  11. K. Otsuka, Y. Ohsawa, K. Yamada and Sekibata, 'A Study on the Alumina Ceramics Casting Conditions by the DoctorBlade Method and their Effect on the Properties of Green Tape(Part),' Yogyo-Kyokai-Shi, 94 [11] 1136-41 (1986) https://doi.org/10.2109/jcersj1950.94.1095_1136
  12. K. Nagata, 'Rheology Behavior of Suspension and Properties of Green Sheet-effect of Compatibility between Dispersant and Binder,' J. Ceram. Soc. Jpn., 100 [10] 1271-75 (1992) https://doi.org/10.2109/jcersj.100.1271
  13. L. Braun, J. R. Morris, Jr. and W. R. Cannon, 'Viscosity of Tape-casting Slips,' Am. Ceram. Soc. Butt., 64 [5] 727-29 (1985)
  14. Y. W. Kim and J. G. Lee, 'Tape Casing of Silicon Nitride,' Mat. Res. Soc. Symp. Proc., 287 265-70 (1993)
  15. M.-H. Lee, I.-S. Park, D.-J. Kim and D.-Y. Lee, 'Effect of Organic Additive Composition on Isostatic Thermocompression Behavior of Alumina Tapes,' J. Kor. Ceram. Soc., 37 [8] 824-31 (2000)
  16. R. Moreno. 'The Role of Slip Additives in Tape-casting Technology: Part I Solvents and Dispersants,' Am. Ceram. Soc. Bull, 71 [10] 1521-31 (1992)
  17. ASTM D 638-95, In: 1996 Annual Book of ASTM Standards Vol. 08.01, Sect 8, American Society for Testing and Materials, Philadelphia, PA, 1996
  18. T. Dabak and O. Yuul, Rheol. Acta., 25 527-33 (1986) https://doi.org/10.1007/BF01774404
  19. M. Rajala, 'Using the Mooney Equation for Analyzing the Sensitivity of Casting Clays,' Am. Ceram. Soc. Bull, 71 [12] 1817-19 (1985)
  20. J. S. Reed, 'Rheology of Saturated Systems (Slurries and Pastes),' pp. 277-309 in Principals of Ceramics Processing, 2nd Edition, John Wiley and Sons, NY, (1995)
  21. T. F. Tadros, 'Rheology of Concentrated Suspensions,' Chem. Ind., 1 210 (1985)
  22. S. H. Pinner, 'Properties of PVC at Elevated Temperatures,' Plastics, 5 82-5 (1965)
  23. M. Descamps, G. Ringuet, D. Legerm and B. Thierry, 'Tape-casting : Relation Between Organic Constituents and the Physical and Mechanical Properties of Tapes,' J. Eur. Ceram. Soc., 15 357-62 (1995) https://doi.org/10.1016/0955-2219(95)90360-U
  24. E. Antoloni, M. Ferretti and S. Gemme, 'Preparation of Porous Nickel Electrodes for Molten Carbonate Fuel Cells by Non-aqueous Tape Casting,' J. Mater. Sci., 31 2187-92 (1996) https://doi.org/10.1007/BF00356644