ZrO2(3Y)包裹Al2O3纳米复合粉体的制备

以pH值缓冲溶液为沉淀剂，用非均匀成核和液相共沉淀相结合的方法合成出了ZrO₂（3Y）包裹Al₂O₃纳米复合粉体.用XRD、TEM对所制备粉体进行了表征.研究表明：加入分散剂使Al₂O₃悬浮液的等电点向酸性区移动，Zeta电位绝对值增大，其中pH值为9.56对应的Zeta电位绝对值最大，悬浮液最稳定.Al₂O₃悬浮液pH值为9.5，ZrOCl₂和YCl₃混合溶液浓度为0.2 mol•L^-1时前驱体的收得率最高.600℃煅烧后得到的粉体中只有α-Al₂O₃、t-ZrO₂两种物相，在Al₂O₃颗粒表面附着10 nm左右的ZrO₂（3Y）颗粒.

Preparation of ZrO2(3Y)encapsulated Al2O3 nanometer composite powders

ZrO₂（3Y）encapsulated Al₂O₃ nano composite powders were prepared by heterogeneous nucleation combined with the liquid co-deposition method using pH buffer solution as precipitator.The synthesized powders were characterized with XRD and TEM.The results indicated that the isoelectric point of Al₂O₃ suspension shifted to acidic side and the absolute value of Zeta potential also increased when a dispersant was added into the suspension.At pH 9.56，the absolute value of Zeta potential reached the maximum and the suspension was most stable.The maximum yield of the precursor was obtained at pH 9.5 and the concentration of ZrOCl₂and YCl₃mixed solution 0.2 mol•L^-1.There existed two phases，i.e.，α-Al2O3 and t-ZrO₂，in the composite powders calcined at 600℃.TEM observation confirmed that nano ZrO2（3Y）particles with a diameter of 10 nm were formed on the surface of Al₂O₃ particles.