Sintered Fe-Al-based alloy porous material and filtering element employing same

Abstract

The invention discloses a sintered Fe-Al-based alloy porous material with better high temperature resistance and antioxidant activity, and a filtering element employing the material. The porosity of the sintered Fe-Al-based alloy porous material is 30% to 60%, and the average pore diameter is 0.5 to 50 mum m; the sintered Fe-Al-based alloy porous material is characterized in that the material is mainly composed of Fe, Al and Si; the sum of the weights of the three elements and accounts for more than 90% of the weight of the sintered Fe-Al-based alloy porous material, wherein the weight of Fe accounts for 60% to 85% of the total weight of Fe and Al, and the weight of Si accounts for 0.5% to 8% of the total weight of Fe, Al and Si; Si in the sintered Fe-Al-based alloy porous material exists mainly in the form of silicon solid solution of Fe-Al-based compound or in the form of Fe5Si and is uniformly distributed in the material approximately; the tensile strength of the sintered Fe-Al-based alloy porous material is larger than or equal to 45 MPa, the thickness is smaller than or equal to 5 mm, and the air flux is large than or equal to 80 m<3>/m<2>/kpa/h; after the material is soaked in NaOH solution with the mass fraction of 5% under the ambient temperature for 15 days, the weight loss ratio is less than 0.5%, and after the material is kept in the atmosphere with the temperature of 800 DEG C for 90 hours, the weight gain rate of the material is tested to be lower than 25%.

Description

technical field [0001] The invention relates to a porous material and a filter element using the porous material, in particular to a sintered Fe-Al base alloy porous material prepared by a powder metallurgy method and a filter element using the porous material. Background technique [0002] At present, the research on sintered porous materials mainly focuses on the optimization of preparation process, the discussion of pore-forming mechanism, the improvement of material properties and the expansion of application range. Among them, as far as the pore-forming mechanism is concerned, the pore-forming methods that have been applied in the preparation method of sintered porous materials mainly include: first, the pore is formed by chemical reaction, which is based on the large difference in the intrinsic diffusion coefficient of different elements. The partial diffusion effect makes Kirkendall pores in the material; second, pores are formed through physical accumulation of raw m...

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Problems solved by technology

Before the filing date of this application, there has not been found a method that can not only improve the high temperature oxidation resistance and strong alkali corrosion resistance of Fe...

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