用离心沉积工艺在粗孔基体材料上制备孔径梯度变化的膜层(简称梯度层),研究复合材料的过滤性能与梯度层的粉末粒度、厚度之间的关系.结果表明,为获得复合材料的最佳过滤性能,梯度层的粉末粒度必须小于基体的中流量平均孔径.随着梯度层厚度的增加,复合材料的透过性能下降,过滤精度提高.为了得到二者的最佳配合,存在着梯度层的最佳匹配厚度,这一厚度与梯度层粉末粒度呈线性关系,且基体的中流量平均孔径值是该直线的截距.
Films with gradient pores (gradient layer) were prepared on rough-pore substrate materials by centrifugal deposition process. The relationship between the filtration performance of the composites and the particle size as well as the thickness of gradient layers was investigated. Results show the particle size of gradient layers should be less than the mean flow pore size of substrate materials so as to obtain the optimum filtration performance. With the thickness of gradient layers increasing, the permeability of the composites decreased while the filtration precision increased. There is optimum matching thickness of gradient layers for the optimum matching of the two performances, which has linear relation with the particle size of gradient layers, and the mean flow pore size of substrate materials is the intercept of the straight line.
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