Study on the Technology of ZrO2-ZrW2O8 Composites Prepared by Co-precipitation Method

doi:10.3724/SP.J.1077.2008.00991

Abstract

Abstract: A low-thermal-expansion ceramic composite of ZrO₂-ZrW₂O₈ was synthesized by co-precipitation route using analytically pure zirconium nitrate [ZrO(NO₃)₂·5H₂O] and ammonium tungstate(H₄₀N₁₀O₄₁W₁₂·xH₂O) as starting materials. Effects of heat-treatment on the transformation from the precursor to ZrO₂-ZrW₂O₈ composite were investigated, and the chemical reaction process of the precursor was explored. The crystal structure, phase transition, cross-section morphology and thermal expansion coefficient of the samples were investigated by X-ray diffraction(XRD), thermogravimetric and differential scanning calorimetry(TG-DSC), scanning electron microscope(SEM) and dilatometry respectively. The results show that the homogeneous ZrO₂-ZrW₂O₈ composites are synthesized after sintering at 1150℃ for 2h. With the increase of sintering time, the full width at half maximum (FWHM) of the ZrW₂O₈ diffraction peaks decreases, and the grain grows up gradually. ZrO₂-50wt%ZrW₂O₈ composite has an average thermal expansion coefficient of -3.2295×10^-6K^-1 from 30℃ to 600℃.

Key words: composite, co-precipitation, low thermal expansion, high temperature transformation

CLC Number:

TQ174

ZHANG Zhi-Ping,LIU Hong-Fei,CHENG Xiao-Nong. Study on the Technology of ZrO₂-ZrW₂O₈ Composites Prepared by Co-precipitation Method[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00991.

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Study on the Technology of ZrO₂-ZrW₂O₈ Composites Prepared by Co-precipitation Method

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