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本文系统地叙述了用球形粉末颗粒制取的多孔材料的基本性能——过滤性能与原始粉末粒度、烧结温度的关系。研究表明,随着温度的提高,对于细粉末材料,其孔径与透过性能均显著下降;对于粗、中颗粒粉末材料,温度的影响不十分显著。随着温度的提高,材料的孔径分布峰值向粗孔径方向偏移。在确定的工艺条件下,原始粉末的粒度对材料的过滤性能起决定作用。用等静压成形烧结工艺制取的多孔材料,过滤精度与原始粉末粒度成直线关系,且二者的比值约为1/7,松装烧结工艺制取的多孔材料,二者的比值约为1/5。随着粉末粒度的增大,材料的透过系数非直线地迅速升高。透过性能主要取决于材料中粉末颗粒的堆积状况,松装烧结的多孔材料具有最佳的透过性能。本研究结果可作为制取多孔材料时正确选择原始粉末粒度与工艺参数的依据。
This paper systematically describes the basic properties of porous materials prepared from spherical powder particles - the relationship between the filtration performance and the original particle size and sintering temperature. The results show that with the increase of temperature, the pore size and permeability of the fine powder materials decrease obviously. The influence of temperature on the coarse and medium powder materials is not obvious. With the increase of temperature, the pore size distribution of the material shifts to the direction of the coarse aperture. Under certain process conditions, the particle size of the original powder plays a decisive role in the filtration performance of the material. The porous material prepared by isostatic pressing and sintering process has a linear relationship with the original powder particle size, and the ratio of the two is about 1/7. The ratio of the two is about 1/5. As the powder size increases, the permeability coefficient of the material increases rapidly non-linearly. Through performance depends mainly on the accumulation of powder particles in the material, loosely sintered porous material with the best permeability. The results of this study can be used as the basis for the correct choice of particle size and process parameters of the original powder when preparing porous materials.