State Key Laboratory of Porous Metal Materials, Northwest Institute for Non-ferrous Metal Research
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DOI:
10.7502/j.issn.1674-3962.2016.02.07
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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 asprepared 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 gassolid separation accuracy can reach 0.35 μm, and the pressure is less than 20 kPa.