液相法制备棒状Al2O3及Al2O3-ZrO2陶瓷复合粉体

采用二乙三胺五乙酸（DTPA）为配合剂，以简易的液相法合成出微纳米纤维状Al和Al-Zr前体，煅烧处理制备了棒状α-Al₂O₃和Al₂O₃-ZrO₂复合陶瓷粉体。同时研究了DPTA∶Al³⁺质量比、反应温度与时间对陶瓷粉体形态的影响。利用X射线衍射（XRD）、热分析（TG/DSC）以及扫描电子显微镜（SEM）对粉体进行了表征。结果表明：较高的DTPA∶Al³⁺质量比以及较长的反应时间有利于制备高长径比的纤维棒状Al和Al-Zr配合物前体。合成纳米纤维状α-Al₂O₃和Al₂O₃-ZrO₂前体的最优条件是反应温度60℃，反应时间5.5h，DTPA∶Al³⁺比例为1.2∶1。相应地，该前体煅烧后可以制备出棒状α-Al₂O₃和Al₂O₃-ZrO₂复合陶瓷粉体。

Preparation of rod-like Al2O3 and Al2O3-ZrO2 ceramic composite powders in aqueous solution

Using diethylenetriaminepentaacetic acid (DTPA) as coordination agent, the micro/nano Al and Al-Zr fibrous precursors were synthesized by a simple liquid synthesis method, and further calcined to make rod-like α-Al₂O₃ ceramic and Al₂O₃-ZrO₂ composite powders. The effects of mass ratio of DTPA to Al³⁺, reaction temperature and time on the morphology of ceramic powders were simultaneously studied. The powders were characterized by X-ray diffraction (XRD), thermal analysis (TG/DSC) and scanning electron microscope (SEM). The results show that higher mass ratio of DTPA to Al³⁺ along with longer reaction time are favorable for the preparation of fibrous Al and Al-Zr complex precursors with high aspect ratio. The optimized conditions to prepare the nanofibrous α-Al₂O₃ and Al₂O₃-ZrO₂ precursors are controlled the mass ratio with m(DTPA)∶m(Al³⁺)=1.2∶1 at 60℃ for 5.5h. Correspondingly, rod-shaped α-Al₂O₃ and Al₂O₃-ZrO₂ composite ceramic powders can be prepared by calcining these precursors.