【作者】 张艾飞； 刘吉平； 吕广庶；

【Author】 ZHANG Ai-fei, LIU Ji-ping , LU Guang-shu(School of Materials Science and Engineering, National Laboratory of Fire Retardant Materials. Beijing Institute of Technology, Beijing 100081. China)

【机构】 北京理工大学材料科学与工程学院阻燃材料国家重点实验室；

【摘要】 本文利用形成纳米ZrO2粉体的前驱体的化学结构特征设计合成一种能与之发生螯合作用的新型分散剂(简称为D1),能够有效地减小颗粒尺寸,提高分散效果.采用螯合分散剂制备纳米氧化锆的最佳工艺条件为:ZrOCl2·8H2O浓度1.0 mol/L,D1分散剂用置1%(ω),沉淀pH值10.0,陈化时间12 h,锻烧温度750℃,锻烧时间1 h.以稀土元素Y作晶型稳定剂,成功制备粒径超细(5-8 nm),均匀分散的四方纳米ZrO2粉体(3Y-TZP).螯合分散剂同十六烷基三甲基氯化铵,TritonX-100等常用分散剂相比,对纳米ZrO2的分散性能和颗粒尺寸的改善效果最为显著,明显优于其它几种分散剂.结果表明根据纳米粉体的化学结构设计特定的分散剂是解决纳米颗粒团聚问题的重要途径.更多还原

【Abstract】 A new kind of dispersant (denoted as D1) chelated with precursors of zirconia nanopowder according to their characteristics of chemical bond was reported. Superfine and well-dispersed ZrO2 nanopowder could be synthesized with the aid of this chelate dispersant. It is a better dispersant to decrease the size and ameliorate the dispersion of zirconia nanopowder than dispersants used conventionally such as hexadecyltrimethyl ammonium chloride and Triton X-100. The optimal conditions of this process are listed as follows: concentration of ZrOCl2 solution in n-butanol/H2O: 1.0mol/L, concentration of Dl dispersant: 1% (ω), precipitation pH: 10.0, precipitation time: 12h, calcining temperature: 750℃, calcining time: 1h. Superfine 3Y-TZP with the diameter of 5-8nm and good dispersion was produced using element yttrium as stabilizer of crystal formation. Our results also show that design of special chemical structure of dispersant in terms of that of nanopowder is a significant route to solve the problem of agglomeration of nanoparticles.更多还原