Synthesis of zirconium tungstate-zirconia core-shell composite particles

Date

2011-11-01

Author

Khazeni, Nasser
MAVİŞ, BORA
Gündüz, Güngör
Colak, Uner

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In this work, ZrW(2)O(8)-ZrO(2) core-shell composite particles were synthesized. ZrW(2)O(8) that was used in the core is a material with negative coefficient of thermal expansion, and it was synthesized from a high-pH precursor based on use of tungstic acid and zirconium acetate. Shell layer was composed of ZrO(2) nanocrystallites and precipitated from an aqueous solution by urea hydrolysis. While volume of the shell was effectively controlled by the initial zirconium ion concentration in the solutions, the rate of precipitation was a function of the ratio of initial concentrations of urea to zirconium ions. It is hypothesized that isolation of the ZrW(2)O(8) within a layer of ZrO(2), will be a key element in solving problems associated with reactivity of ZrW(2)O(8) towards other components in sintering of ceramic-ceramic composites with tuned or zero thermal expansion coefficient. (C) 2011 Elsevier Ltd. All rights reserved,

Subject Keywords

Mechanical Engineering, General Materials Science, Mechanics of Materials, Condensed Matter Physics

URI

https://hdl.handle.net/11511/57441

Collections

Department of Chemical Engineering, Article