Rapid In Situ Reactive Sintering and Properties of ZrO₂-ZrW₂O₈ Composites

Abstract:

ZrO2-ZrW2O8 diphasic composites with controllable coefficients of thermal expansion (CTEs) are synthesized by rapid in-situ reactive sintering with ZrO2 and WO3 as reactants. High density of ZrO2-ZrW2O8 composites without decomposition of ZrW2O8 is obtained with Y2O3 sintering additive. The CTEs of specimen with ZrO2 to ZrW2O8 mass ratio 1:1.0, 1:1.3, 1:1.5 and 1:2.0 are measured to be about 1.20×10−6, 0.31×10−6, -0.78×10−6 and -1.13×10−6 K−1, respectively. Raman mappings demonstrate homogenous dispersions of ZrO2 and ZrW2O8 in the ZrO2-ZrW2O8 composites. In addition to the role as sintering additive, some Y3+ cations enter the lattice to substitute Zr4+ in ZrW2O8, leading to an increase in disorder and a decrease in phase transition temperature of ZrW2O8 in the composites.

• Periodical: Advanced Materials Research (Volumes 535-537)
• Pages: 42-46
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.535-537.42
• Online since: June 2012
• Authors: Xiang Yang Guo, Chun Zhen Fan, Xian Sheng Liu, Wen Bo Song, Chun Xiao Cheng, Er Jun Liang, Ming Ju Chao, Bin Yuan
• Keywords: Phase Transition, Raman Spectroscopy and Mapping, Thermal Expansion, ZrO₂-ZrW₂O₈ Composite

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