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A Review of the Aqueous Chemistry of the Zirconium - Water System to 200°C

The aqueous chemistry of the Zr-H{sub 2}O system is reviewed. It is shown that the thermodynamically stable solid phase for the Zr-H{sub 2}O system at 25 C is the monoclinic phase. After a review of the chemistry of the pure material in water, a summary of the solution equilibria of the Zr-H{sub 2}O system is presented followed by a discussion of the aqueous phase stability of the monoclinic and tetragonal phases of the pure ZrO{sub 2} system. Last, a discussion of the phase stability of the complex metal oxides, particularly the Y{sub 2}O{sub 3}-containing TZP in aqueous solution will be reviewed. It will be shown that the phase stability for the complex metal oxide-zirconia systems may be best understood as corrosion with the alloying agent (e.g., Y{sub 2}O{sub 3}) subject to leaching from a zirconia-rich interface.