Fabrication of porous clay ceramics using sufactant

계면활성제를 이용한 점토질 다공체 세라믹스 제조에 관한 연구

  • 김윤주 (동신대학교 공과대학 세라믹공학과) ;
  • 배옥진 (동신대학교 공과대학 세라믹공학과)
  • Published : 2002.02.01

Abstract

Porous clay ceramics was fabricated using the surfactant as a foaming agent in the secondary-clay produced at Young-Am area in Chun-Nam province. The concentration of surfactant in ceramic slurry was the key factor controlling the pore characteristics and physical properties of the porous ceramics. The more increase of the surfactant concentration increase the more foaming ability and the stability of foamed layer were improved, but the foaming ability was limited within 6.0 wt% of surfactant because the initial viscosity of the slurry increased with increasing the amounts of surfactant. The formed specimen were sintered at both $1150^{\circ}C$ and $1200^{\circ}C$, the porous ceramics showed 0.9 of specific gravity, 50% of water absorption, 45% of apparent porosity, 14% of shrinkage and 70 kg/$\textrm{cm}^2$ of compressive strength.

전남 영암산 이타점토 출발원료에 계면활성제를 사용하여 고농도의 slurry를 발포시킨 후 성형하여 다공질 세라믹스를 제조하였다. slurry에서의 계면활성제 농도변화는 다공질 세라믹스의 기공변화 및 물리적 특성을 제어하는 중요한 요인이었다. 발포용 slurry의 농도는 발포제인 계면활성제 농도가 증가할수록 발포력과 포말층의 안전도는 향상되었으나, 6.0 wt% 농도 이상에서는 계면활성제 양이 많아짐으로써 초기 slurry의 점도가 높아져 발포력이 좋지 못했다. 성형시편을 $1150^{\circ}C$$1200^{\circ}C$ 온도에서 소성하였고, 그 결과 부피비중은 약 0.9, 흡수율은 45%, 겉보기 기공율은 50%, 수축율은 14% 그리고 압축강도는 70kg/$\textrm{cm}^2$인 다공질 세라믹스를 제조할 수 있었다.

Keywords

References

  1. Soc. Chemical. Eng. Japan v.25 no.1 Preparation Technique of High-Porosity Ceramics T. Yokota;T. Aono;Y. Matsuda
  2. J. Am. Ceram. Soc. v.72 no.7 Fracture Behavior of Open-Cell Ceramics R. Brezhy;David J. https://doi.org/10.1111/j.1151-2916.1989.tb09698.x
  3. Ceram. Bul. v.70 no.4 Ceramic Membranes Growth Prospects Opportunities K.K. Chan;M. Brownstem
  4. J. Am. Ceram. Soc. v.73 no.1 Processing and Properties of Cellular silica Synthesized by Foaming Sol-Gels T. Fujiu https://doi.org/10.1111/j.1151-2916.1990.tb05095.x
  5. J. Am. Ceram. Soc. Bul. v.71 no.11 Processing of Porous Ceramics J.S. Woyansky;C.E. Scott
  6. Soc. Chemical Eng. Japan v.12 no.1 Preparation of Porous Ceramics from Industrial Waste Silica Mineral S. Furuta;H. Nakao;H. Katsuki
  7. J. Kor. Ceram. Soc. v.35 no.6 preparation for Porous Ceramics Using Low Grade Clay S.M. Han
  8. J. Kor. Ceram. Soc. v.35 no.12 Preparation of Porous Inorganic Materials by Foaming Slurry J.K. Park
  9. J. Kor. Ceram. Soc. v.36 no.9 Effects of Fabrication Variables and Microstructures on the Compressive Strength of Open Cell Ceramics H.N. Choi;S.H. Han
  10. J. Kor. Ins. Mineral Energy Resource Engineers v.32 no.3 Experimental Study on Foaming Ability and Foam Stability of Surfactant Aqeous Solution J.K. Park;J.R. Lee
  11. v.33 J.J. Bikerman;Foam
  12. Surfaces interfaces and colloids v.251 Derw Myers
  13. Foams and Biliquid Foams-Aphrons v.47 Felix Sebba
  14. Surfactants and Interfacial Phenomena v.200 R.J. Milton