李国锋,王志强.静电场对介电性粒子沉积影响[J].,2010,(6):845-849 |
静电场对介电性粒子沉积影响 |
Effect of electrostatic field on deposition of dielectric particles |
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DOI:10.7511/dllgxb201006001 |
中文关键词: 静电场 粒子链 陶瓷纤维 |
英文关键词: electrostatic field particle chain ceramic fiber |
基金项目:国家自然科学基金资助项目(50572011). |
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中文摘要: |
利用非均匀电场力控制气-固两相分散系中的悬浮介电性微细粒子聚集形态,分析和探讨了静电场对介电性粒子沉积的影响.首先,经实验研究得到了介电粒子链形成的两个必要条件 有偶极子和非均匀梯度场的存在.然后,利用Al 2O 3粉体材料制备了纤维网状多孔陶瓷膜.分散在气体中的粒子在非均匀电场的作用下形成粒子链聚集体,沉积在基材表面,形成三维网状结构的多孔性附着层,经烧结,使附着层陶瓷化,增加力学强度,在基材表面得到纤维网状结构多孔陶瓷膜. |
英文摘要: |
The aggregation morphology of suspension dielectric particle in non-uniform electric field was investigated based on gas-solid two-phase system. Meanwhile, the deposition of particle chains in electrostatic field was analyzed and discussed. Experiments were carried out to research into the formation condition of dielectric particle chains. Experimental results demonstrate that the existence of dipole and non-uniform gradient field is the necessary formation condition of dielectric particle chains. Moreover, porous ceramic membrane is prepared by sintering Al 2O 3 fine powders which aggregate into chain structures. Due to non-uniform electric field, the dispersed adjacent particles in gas phase aggregate to particle chains, and deposit on the substrate surface and form three-dimensional network structure of porous adhesion layer. After sintering, particle chains become tiny ceramic fibers which constitute porous ceramic membranes on the substrate surface and enhance mechanics strength. |
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