金属アルコキシドの重縮合によるY_2O_3ドープZrO_2塊状ゲルの合成と加熱変化(第1報) : 透明塊状ゲルの調製

概要

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Polymeric gels of Y-doped zirconia were successfully prepared by the controlled hydrolysis and polycondensation of zirconium n-propoxide and yttrium nitrate. The following parameters affected on the reaction mechanism and the microstructure of the resulting gels: (1) the kind of catalyst, (2) the water to alkoxide ratio and (3) the amount of yttrium nitrate . Acetic acid was very effective to control the alkoxide reaction under the limited water to alkoxide ratio. The complex effect of the steric hindrance by alkoxide-acetic acid chelating and the enhanced hydrolysis by the increased proton could control the polycondensation moderately. The yttrium nitrate hydrate acted as a hydrolysis accelerator, which also affected the microstructure of the resulting gel. Transparent monolithic gels of Y-doped zirconia containing up to 10 mol% yttrium oxide were successfully prepared by optimizing these parameters.
社団法人日本セラミックス協会の論文
1992-02-01