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Fabrication and characteristics of porous ceramics from ZrTiO₄based ceramic material

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2008, 18(1), pp.5~9
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering

허근 1,  Kwang Bo Shim 2,  명성재 1,  이용현 3,  전명표 1,  조성호 1,  KIM BYUNG IK 4

1요업기술원
2한양대학교
3청정소재산업진흥원
4한국세라믹기술원

Accredited

ABSTRACT

Cordierite has a very low thermal expansion coefficient, but has problem that it has a weak mechanical strength and is apt to be attacked by acid such as sulfur for using as a diesel particulate filter support. The physical properties of ZrTiO₄modified with SiO₂, Al₂O₃, MoOx, Cr₂O₃ and Nb₂O5 were investigated with XRD, SEM, UTM and thermal expansion, etc. in this paper. ZrTiO₄powder was synthesized as a monoclinic structure with processes that starting materials of TiO₂ and ZrO₂were mixed with ball mill and calcined above 1240℃ for 3 hr. Additive modified ZrTiO₄specimens for flexural strength and thermal expansion measurement were obtained by mixing ZrTiO₄ powder with additives, pressing and firing at 1300℃ for 3 hr. The porosity of additive modified ZrTiO₄decreased monotonically with increasing additive content by 5 wt% regardless of additive types and saturated for further increase of additive by 10wt. The flexural strength of Al2O3 (5, 10 wt%) modified ZrTiO₄shows a large increase, but that of other additives modified ZrTiO₄decreased. The thermal expansion coefficient of additive modified ZrTiO4 except Nb₂O5 decreased continuously with the content of additive. In particular, the lowest thermal expansion coefficient of ZrTiO₄was obtained for the additive of SiO₂.

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