Application of urea precipitation method in preparation of advanced ceramic powders
Application of urea precipitation method in preparation of advanced ceramic powders
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DOI：
10.1016/j.ceramint.2015.06.032
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
Haiming Qin;X. Tan;Wuchao Huang;Jun Jiang;Hao-chuan Jiang
中科院分区：
文献类型：
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作者：
Haiming Qin;X. Tan;Wuchao Huang;Jun Jiang;Hao-chuan Jiang
尿素沉淀法是制备具有特定形貌和组成的无机粒子的一种重要方法。本文综述了尿素沉淀法在制备高性能陶瓷粉体中的应用研究进展和成果。尿素在水溶液中热分解过程中获得的稳定pH值使其在超细粉体的精确组成控制方面具有很大的应用前景。讨论了尿素在水溶液中的分解机理，系统地介绍了尿素在制备单分散/双分散颗粒中的应用。明确的尿素分解机理为研究者从超细颗粒形成初期开始分析其演变过程提供了可能。最后，展望了该方法的应用前景，如设计成分核壳粒子的制备和沉淀动力学研究。
Urea precipitation method has been developed as an important approach for the preparation of inorganic particles with defined morphology and composition. In present work, we provide survey of the technological developments and achievements mainly on the application of the urea precipitation method in preparation of advanced ceramics powders. Stable pH obtained during the thermal decomposition of urea in aqueous solution make it quite promising for the precise composition control of ultrafine powders. The decomposition mechanism of urea in aqueous solution is discussed before a systematic description of its application in the preparation of monodispersed particles with unary/binary composition. Clear decomposition mechanism of urea provides researchers a possibility to analyze the evolution process of ultrafine particles from its initial forming period. Finally, the application potential and future prospects of this method, such as preparation of core–shell particle with designed composition and precipitation kinetics study, are outlined.