Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Spray Drying of Zirconia/Alumina Composite Powder Using PVP as a Binder

PVP 결합제를 이용한 지르코니아/알루미나 복합분말의 분무건조

  • Shim, Hyung-Bo (Department of Ceramics Engineering, Yonsei University, Multifunctional Ceramics Research Center, Korea Institute of Science and Technology) ;
  • Moon, Joo-Ho (Department of Ceramics Engineering, Yonsei University) ;
  • Kim, Dae-Joon (Multifunctional Ceramics Research Center, Korea Institute of Science and Technology)
  • 심형보 (연세대학교 세라믹공학과, 한국과학기술연구원 복합기능세라믹 연구센타) ;
  • 문주호 (연세대학교 세라믹공학과) ;
  • 김대준 (한국과학기술연구원 복합기능세라믹연구센타)
  • Published : 2002.01.01
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Abstract

Zirconia/alumina mixture powder was spray-dried various degree of dispersion, type of dispersants and powder content in the slurry. The quality of the granule was determined by observation of the granule shapes after spray drying and fracture of intergranular boundaries during pressing. Defect-free granules were obtained from the powders that formed weak flocs in the slurry. The granules, spray-dried from the slurry containing 32.5 vol% powder mixture and PVP as binder, were fractured completely during shaping and the sintered specimens showed a density of 99.7% and a flexural strength of 850 MPa.

지르코니아/알루미나 복합분말의 분무건조로 제조된 과립들의 형상과 성형시 과립 경계면 파괴에 분말의 분산 정도, 결합제의 종류, 그리고 고형분말 함량이 미치는 영향을 관찰하였다. 구형의 과립은 복합분말 슬러리가 완전 분산이 되지 않고 약간의 floc을 형성하고 결합제로서 Polyvinyl Pyrrolidone(PVP)을 사용했을 때 얻어졌다. PVP를 결합제로 사용하고 분말함량이 32.5 vol%인 슬러리로 분무건조한 분말은 성형시 과립경계면이 파괴되어 소결밀도는 99.7%이었고 굴곡강도는 850Mpa이었다.

Keywords

References

  1. S. J. Lukasiewicz, 'Spray-drying Ceramic Powder,' J. Am. Ceram. Soc., 72 [4] 617-24 (1989) https://doi.org/10.1111/j.1151-2916.1989.tb06184.x
  2. W. J. Walker Jr., J. S. Reed and S. K. Verma, 'Influence of Granule Character on Strength and Weibull Modulus of Sin-tered Alumina,' J. Am. Ceram. Soc., 82 [1] 50-6 (1999) https://doi.org/10.1111/j.1151-2916.1999.tb01722.x
  3. S. Baklouti, Thierry Chartier and Jean Francois Baumard, 'Mechanical Properties of Dry-pressed Ceramic Green Products: The Effect of the Binder,' J. Am. Ceram. Soc., 80 [8] 1992-96 (1997) https://doi.org/10.1111/j.1151-2916.1997.tb03082.x
  4. R. G. Frey and J. W. Halloran, 'Compaction Behavior of Spray Dried Alumina,' J. Am. Ceram. Soc., 67 [3] 199-203 (1984) https://doi.org/10.1111/j.1151-2916.1984.tb19742.x
  5. R. A. DiMilia and J. S. Reed, 'Stress Transmission During the Compaction of a Spray-dried Powder in a Steel Die,' J. Am. Ceram. Soc., 66 [9] 667-72 (1983) https://doi.org/10.1111/j.1151-2916.1983.tb10619.x
  6. W. J. Walker Jr., J. S. Reed and S. K. Verma, 'Polyethylene Glycol Binders for Advanced Ceramics,' Ceram. Eng. Sci. Proc., 14 [11-12] 58-79 (1993)
  7. K. Masters, 'Applying Spray Drying to Ceramics,' Am. Ceram. Soc. Bull., 73 [1] 63-72 (1994)
  8. W. J. Walker, Jr. and J. S. Reed, 'Influence of Slurry Param-eters on the Characteristics of Spray-dried Granules,' J. Am. Ceram. Soc., 82 [7] 1711-19 (1999) https://doi.org/10.1111/j.1151-2916.1999.tb01990.x
  9. F. S. Shaw, 'Spray Drying: A Traditional Process for Advanced Applications,' Am. Ceram. Soc. Bull., 69 [9] 1484-89 (1990)
  10. J. S. Reed, 'Spray Drying and Implications for Compact-ibility of Product Granules,' Ceram. Eng. Sci. Proc., 18 [2] 343-58 (1997) https://doi.org/10.1002/9780470294420.ch35
  11. R. A. Dimillia and J. S. Reed, 'Dependence of Compaction on the Glass Transition Temperrature of the Binder Phase,' Am. Ceram. Soc. Bull., 62 [4] 484-88 (1983)
  12. L. M. Shepard, 'The Changing Demand for Ceramic Addi-tives,' Ceram. Bull, 69 [5] 802-06 (1990)
  13. S. L. Bassner and E. H. Klingenberg, 'Using Poly(Vinyl Alcohol) as a Binder,' Ceram. Bull., 11 [5] 71-5 (1998)
  14. R. Bast, 'Organic Additives for Dry-pressing,' Interceram., 39 [6] 13-4 (1990)
  15. D. J. Shanefield, Organic Additives and Ceramic Process-ing, 2nd Ed., pp. 255-79 Kluwer Academic Publishers, Bos-ton, 1999
  16. H. Kozuka and M. Kajimura, 'Single-step Dip Coating of Crack-free $BaTiO_3$ Film>$1\mu m $ Thick: Effect of Poly (Vinylpyrrolidone) on Critical Thickness,' J. Am. Ceram. Soc., 83 [5] 1056-62 (2000) https://doi.org/10.1111/j.1151-2916.2000.tb01330.x
  17. D. Y. Lee, D. J. Kim, M. H. Lee and J. W. Jang, 'Flaw Tol-erance of (Y, NbUTZP/AlUOs Composites(in Kor),' J. Kor. Ceram. Soc., 38 [1] 56-60 (2000)
  18. A. S. Barnes, J. S. Reed and E. M. Anderson, 'Using Cobin-der to Improve Manufacturability,' Am. Ceram. Soc. Bull.,76 [7] 77-82 (1997)