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对醇盐水解法制备的 Y_2O_3稳定 ZrO_2超细粉体进行了研究.在不同的水解条件下,由异丙醇锆和硝酸钇的异丙醇溶液制取8mol%Y_2O_3-ZrO_2粉体,并对粉体的性能进行了表征,探讨了粉体的形成机制、细分散性和某些因素对它们的影响.结果表明:水解介质的 pH 值和 H_2O/Zr 比对水解凝胶化过程有较大的影响,通过改变水解和缩聚两个反应发生的相对程度,影响最终粉体的性能.在碱性条件下,通过锆的醇盐和钇的无机盐混合水解可以获得组成均匀、无明显团聚的10nm 以下的稳定氧化锆细粉.
Y2O3 stabilized ZrO2 superfine powder prepared by alkoxide hydrolysis was studied.Under different hydrolysis conditions, 8mol% Y2O3-ZrO2 powder was prepared from isopropanol solution of zirconium isopropoxide and yttrium nitrate, The formation mechanism, fine dispersibility and the influence of some factors on the powder were discussed.The results showed that the pH value and H_2O / Zr ratio of the hydrolysis medium had a great effect on the hydrolysis and gelation process Affect the performance of the final powder by changing the relative degree of the two reactions of hydrolysis and polycondensation.Under alkaline conditions, the mixed solution of zirconium alkoxide and yttrium inorganic salt can obtain a uniform composition, no significant agglomeration of 10nm The following stable zirconia powder.