Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Synthesis and Sintering Behavior of Zr2WP2O12 Ceramics

Zr2WP2O12 세라믹스의 합성과 소결거동 연구

  • Kim, Yong-Hyeon (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Kim, Nam-Ok (Department of Advanced Materials Science and Engineering, Mokpo National University) ;
  • Lee, Sang-Jin (Department of Advanced Materials Science and Engineering, Mokpo National University)
  • 김용현 (국립목포대학교 신소재공학과) ;
  • 김남옥 (국립목포대학교 신소재공학과) ;
  • 이상진 (국립목포대학교 신소재공학과)
  • Received : 2012.07.16
  • Accepted : 2012.08.27
  • Published : 2012.11.30
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Abstract

$Zr_2WP_2O_{12}$ powder, which has a negative thermal expansion coefficient, was synthesized by a solid-state reaction with $ZrO_2$, $WO_3$ and $NH_4H_2PO_4$ as the starting materials. The synthesis behavior was dependent on the solvent media used in the wet mixing process. The $Zr_2WP_2O_{12}$ powder prepared with a solvent consisting of D. I. water was fully crystallized at $1200^{\circ}C$, showing a sub-micron particle size. According to the results obtained from a thermal analysis, a $ZrP_2O_7$ was synthesized at a low temperature of $310^{\circ}C$, after which it was reacted with $WO_3$ at $1200^{\circ}C$. A new sintering additive, $Al(OH)_3$, was applied for the densification of the $Zr_2WP_2O_{12}$ powders. The cold isostatically pressed samples were densified with 1 wt% $Al(OH)_3$ additive or more at $1200^{\circ}C$ for 4 h. The main densification mechanism was liquid-phase sintering due to the liquid which resulted from the reaction with amorphous or unstable $Al_2O_3$ and $WO_3$. The densified $Zr_2WP_2O_{12}$ ceramics showed a relative density of 90% and a negative thermal expansion coefficient of $-3.4{\times}10^{-6}/^{\circ}C$. When using ${\alpha}-Al_2O_3$ as the sintering agent, densification was not observed at $1200^{\circ}C$.

Keywords

References

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