High Temperature Stability of Zirconium Tungstate

Abstract:

In this paper, zirconium tungstate ceramic with negative thermal expansion coefficients was prepared from zirconium oxide and tungstic acid by solid phase synthesis and high temperature quenching technique with a sintering temperature of 1200 °C. The phase structure of the material was determined by X ray and the thermal expansion coefficient was measured by dilatometer, while the TG-DTA analysis of the prepared material was also carried out. The results showed that zirconium tungstate with high purity could be obtained by rapid chilled while fired at 1200 °C. The coefficient of thermal expansion at 300 °C was minus 8.5413 × 10^-6K^-1, which is identical with the theoretical value. The thermal expansion coefficient of the material was negative fired lower than 750 °C, while it was positive fired higher than 750 °C, and this indicates that the decomposition temperature of zirconium tungstate is about 750 °C.

• Periodical: Materials Science Forum (Volume 993)
• Pages: 771-775
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.993.771
• Online since: May 2020
• Authors: P. Zhai*, Xiao Feng Duan, Da Qian Chen
• Keywords: High Temperature Quenching Technique, Negative Thermal Expansion, Solid-Phase Synthesis, Tungstic Acid, Zirconium Oxide, Zirconium Tungstate

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