连续梯度金属多孔材料的研究<br />-中国材料进展

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Author(s):: WANG Qiangbing; TANG Huiping; YANG Baojun; State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research

摘要:: 梯度金属多孔材料是孔径或孔隙率沿厚度方向变化的一类金属多孔材料，也叫非对称金属多孔材料或微孔金属膜，由孔径较大的支撑体和孔径较小的精度控制层组成。支撑体主要起骨架增强作用，精度控制层主要拦截颗粒。采用离心沉积的方法，在模具腔内壁形成梯度粉末层坯料，取出坯料进行干燥、烧结后获得连续梯度金属多孔材料。过滤试验表明，在相同精度等级下，该梯度多孔材料的透过性能是常规相同孔径金属多孔材料的10倍以上，是突变孔径梯度金属多孔材料的3倍以上。羰基铁高压分解气过滤应用表明，连续梯度金属多孔材料具有精度高、处理量大等特点。与常规金属多孔材料相比，在羰基铁高压分解气过滤等方面具有明显优势，气固分离精度可达0.35 μm，运行压差小于20 kPa。

Abstract:: Graded porous metal material is a type of material with the variations of pore size and porosity along its thickness, refered to as asymmetric porous metal material or microporous metal film. The porous material consists of the support layer with large pore size and the precision control layer with small pore size. The support layer is the skeleton and the precision control layer intercepts particles. The centrifugal desoposition was used to form graded powder layer flan in mould inner walls, then the flan was taken out and dried. We obtained the continuously graded porous metal materials by sintering the flan. Filtration test results showed that the permeability of the continuously graded porous metal materials is more than tenfold that of typical porous materials with the same pore size, and more than 3 times than break graded porous metal materials. The high pressure decomposition gas of carbonyl iron was filtred with asprepared materials. The results indicated that the continuously graded porous metal materials have high accuracy, large amount of treatment and so on. While compared with typical porous materials, the continuously graded porous metal materials used in high pressure decomposition gas filtering of carbonyl iron have obvious merit, i.e. the gassolid separation accuracy can reach 0.35 μm, and the pressure is less than 20 kPa.