Method of preparing bore diameter gradient FeAl intermetallic compound homogeneity filtering membrane
A technology of intermetallic compounds and filtration membranes, applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve problems such as poor structural stability of metal materials, environmental restrictions on the use of filtration membranes, poor formability and sintering performance of ceramic particles, etc. , to achieve the effect of improving anti-oxidation performance, excellent anti-oxidation performance, and improving anti-oxidation performance
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Embodiment 1
[0012] The mixed powder of Fe powder with an average particle size of 6 μm and Al powder with a particle size of 60 μm or less is used for mixing according to the composition ratio of Fe-40at.% Al, and molded under a pressure of 300 MPa to make a diameter of 32 mm and a thickness of 1 ~ 2mm sheet filter blank. Subsequently, a metal Al film and a metal Fe film were evenly plated on one side of the filter blank by magnetron sputtering, and the thicknesses of the metal Al film and the Fe film were both controlled at 4 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 130°C for 40 minutes, and then the temperature is raised to 1000°C at a rate of 6°C / min, and the hold is held for 50 minutes; the sintering atmosphere is hydrogen; in the cooling stage, the cooling rate is controlled at 40°C / min min. The pore size gradient FeAl intermetallic compound homogeneous sheet filter membrane thus prepared has a porosity of 33% and a maximu...
Embodiment 2
[0014] The mixed powder of Fe powder with an average particle size of 10 μm and Al powder with a particle size of 20 μm or less is used for mixing according to the composition ratio of Fe-30at.% Al, and cold isostatic pressing is used to form a tubular billet with an isostatic pressure of 100 MPa. A tubular shaped filter blank with an outer diameter of 30 mm, an inner diameter of 28-29 mm and a height of 200 mm was prepared. Subsequently, a layer of metal Al film and a layer of metal Fe film were evenly plated on the outer surface of the tubular filter blank by means of ion plating, and the thicknesses of the metal Al film and the Fe film were both controlled at 10 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 120°C for 30 minutes, and then the temperature is raised to 1300°C at a rate of 2°C / min, and the hold is kept for 40 minutes; the sintering atmosphere is vacuum, and the vacuum degree is 1×10 -1 ~1×10 -3 Pa; in the...
Embodiment 3
[0016] The mixed powder of Fe powder with an average particle size of 20 μm and Al powder with a particle size of 10 μm or less is used for mixing according to the composition ratio of Fe-35at.% Al, and cold isostatic pressing is used to form a tubular billet with an isostatic pressure of 100 MPa. A tubular shaped filter blank with an outer diameter of 30 mm, an inner diameter of 28-29 mm and a height of 200 mm was prepared. Subsequently, a layer of metal Al film and a layer of metal Fe film were uniformly coated on the outer surface of the tubular filter blank by means of thermal evaporation, and the thicknesses of the metal Al film and the Fe film were both controlled at 6 μm. The reaction synthesis adopts a pressureless sintering process. First, the temperature is kept at 120°C for 30 minutes, and then the temperature is raised to 1300°C at a rate of 2°C / min, and the hold is kept for 40 minutes; the sintering atmosphere is vacuum, and the vacuum degree is 1×10 -1 ~1×10 -3 ...
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