| Porous metal filter material with low density, high specific surface area, to maintain a certain metals and alloys’own characteristics, pore size and pore easy to control, so as to have excellent fluid permeability, machinability, high temperature resistance, good thermal shock resistance,excellent cleaning and regeneration performance. Porous metal membrane overcomes the traditional polymer or inorganic ceramic membrane vulnerable to pollution, short service life, low compressive strength, hard to mechanical processing, welding and other shortcomings, can be prolonged use under a relatively harsh environmental conditions.China is a country with coal as primary energy. Advanced Coal-Fired Combined Cycle (ACPCC) power generation technology including Integrated Gasification Combined Cycle (IGCC) and Pressurized Fluidized Bed Combined Cycle (PFBC-CC) in the field of clean coal technology have been restricted by high temperature and high pressure coal (smoke) gas purification dust removal technology; Fe-Al intermetallic compound with low cost, good high temperature strength, high temperature oxidation resistance and resistance to sulfide completely met the high temperature and high pressure, high sulfide atmosphere flue gas dust removal request, therefore Fe-Al intermetallic compound as a material of high filtration precision, high permeability porous metal membrane is worth for further research and industrial applications.This article adopts suspended particle sintering method of preparation of porous metal membrane. The research studied the stability of the suspension configuration, viscosity of the suspension, the ratio of raw material powder, gun speed, tube axial rotation speed of process parameters on the membrane surface morphology in Spraying. Research shows that: with the increase of content of PVB suspension viscosity increased, stability is improved; Spraying slurry in solvent volatilization type principle into membrane, suspension viscosity too low lead to membrane layer, flow mark and cracks; suspension viscosity too high to produce pinhole. Mathematical model is established by spray gun speed, pipe axial rotation speed estimate powder with specific flow control film thickness.With the average particle size is 21 μm powder coating film, under the system of different temperature and atmosphere debinding and sintering, The article researches its membrane mechanism and its different raw material powder particle size, membrane thickness and sintering temperature on the film surface roughness, permeability, film aperture and membrane layer combined with the strength of the relationship between the performance. By controlling the process parameters to obtain a high filtration precision, high permeability, reproductive performance porous metal membrane and finally to find an efficient, low cost, short process cycle, for large-scale industrial production of a Fe-Al intermetallic compound for preparing a porous metal membrane. |
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