Browse > Article
http://dx.doi.org/10.4191/kcers.2012.49.6.586

Synthesis and Sintering Behavior of Zr2WP2O12 Ceramics  

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)
Publication Information
Journal of the Korean Ceramic Society / v.49, no.6, 2012 , pp. 586-591 More about this Journal
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
$Zr_2WP_2O_{12}$; Thermal expansion; Sintering; $Al_2O_3$; $Al(OH)_3$; Microstructure;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 D. G. Calas, L. Cormier, L. Galoisy, C. Jousseaume, G. Querel, and M. Newville, "In Situ Study of Nucleation of Zirconia in an $MgO-Al_2O_3-SiO_2$ Glass," J. Am. Ceram. Soc., 93 [2] 342-44 (2010).   DOI
2 K. H. Lee, Y. S. Kim, Y. J. Jung, T. H. Kim, J. H. Seo, and B. K. Ryu, "A Study of Sintering Behavior and Crystallization in $Li_2O-Al_2O_3-SiO_2$ (LAS) Glass System by RSM," J. Kor. Ceram. Soc., 44 [8] 451-56 (2007).   과학기술학회마을   DOI
3 T. Isobe, T. Umezome, Y. Kameshima, A. Nakajima, and K. Okada, "Preparation and Properties of Negative Thermal Expansion $Zr_2WP_2O_{12}$ Ceramics," Mater. Res Bull., 44 [11] 2045-9 (2009).   DOI
4 S. Yilmaz and D. C. Dunand, "Finite-element Analysis of Thermal Expansion and Thermal Mismatch Stresses in a Cu-60 vol% $ZrW_2O_8$ Composite," Comp. Sci. Technol., 64 1895-98 (2004).   DOI
5 L. Sun and P. Kwon, "$ZrW_2O_8/ZrO_2$ Composites by in situ Synthesis of $ZrO_2+WO_3$: Processing, Coefficient of Thermal Expansion, and Theoretical Model Prediction," Mater. Sci. Eng. A., 527 93-7 (2009).   DOI
6 X. Yang, X. Cheng, X. Yan, J. Yang, T. Fu, and J. Qiu, "Synthesis of $ZrO_2/ZrW_2O_8$ Composites with Low Thermal Expansion," Comp. Sci. Technol., 67 1167-71 (2007).   DOI
7 X. Yang, J. Xu, and H. J. Li, "In Situ Synthesis of $ZrO_2/ZrW_2O_8$ Composites with Near-Zero Thermal Expansion," J. Am. Ceram. Soc., 90 [6] 1953-55 (2007).   DOI
8 X. Chu, R. Huang, H. Yang, Z. Wu, J. Lu, Y. Zhou, and L. Li, "The Cryogenic Thermal Expansion and Mechanical Properties of Plasma Modified $ZrW_2O_8$ Reinforced Epoxy," Mater. Sci. Eng. A., 528 3367-74 (2011).   DOI
9 K. Kanamori, T. Kineri, R. Fukuda, T. Kawano, and K. Nishio, "Low-temperature Sintering of $ZrW_2O_8-SiO_2$ by Spark Plasma Sintering," J. Mater. Sci., 44 855-60 (2009).   DOI
10 A. Matsumoto, K. Kobayashi, T. Nishio, and K. Ozaki, "Fabrication and Thermal Expansion of $Al/ZrW_2O_8$ Composites by Pulse Current Sintering Process," Mater. Sci. Forum., 426-432 2279-84 (2003).   DOI
11 H. S. Kim, "A Study on Laser-Sealing Process of Lead-Free Glass Systems for OLED," pp 26-78, Ph. D. Thesis, Soon Chun Hyang University, Asan, Korea, 2011.
12 S. M. Ha, "Development of Lead-free Glass Systems for OLED Sealing," pp 26-78, Ph. D. Thesis, Soon Chun Hyang University, Asan, Korea, 2011.
13 J. S. O. Evans, T. A. Mary, and A. W. Sleight, "Structure of $Zr_2(WO_4)(PO_4)_2$ from Powder X-Ray Data: Cation Ordering with No Superstructure," J. Solid State Chem., 120 101-4 (1995).   DOI
14 T. Isobe, Y. Kato, M. Mizutani, T. Ota, and K. Daimon, "Pressureless Sintering of Negative Thermal Expansion $ZrW_2O_8/Zr_2WP_2O_{12}$ Composites," Mater. Lett., 62 3913-15 (2008).   DOI
15 J. L .Waring, "Phase Equilibria in the System Aluminum Oxide Tungsten Oxide," J. Am. Ceram. Soc., 48 [9] 493-94 (1965).   DOI
16 L. L. Y. Chang, M. G. Scroger, and B. Phillips, "Alkaline- Earth Tungstates: Equilibrium and Stability in the M-W-O Systems," J. Am. Ceram. Soc., 49 [7] 385-90 (1966).   DOI