Palladium composite membrane taking multihole FeAlCr as substrate and preparation method thereof
A composite membrane, palladium alloy membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation and other directions, can solve the problems of shortening the service life of the palladium composite membrane, reducing the hydrogen permeation rate of the palladium composite membrane, etc., to optimize the porous Substrate surface, good anti-tritium leakage, prolong service life effect
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Embodiment 1
[0020] (1) Mix Fe powder, Cr powder, Al powder and plasticizer evenly, and then use powder metallurgy process to prepare the pore size of 5 μm and relative air permeability of 10 m through forming, degreasing and sintering. 3 / h·KPa·m 2 , the wall thickness is 1mm, and the tube length is a porous FeAlCr matrix tube of 600mm; the plasticizer is paraffin, and the addition of the plasticizer is 15% of the total mass of Fe powder, Cr powder and Al powder; the porous FeAlCr matrix The mass percentage of Al in the tube is 5%, the mass percentage of Cr is 5%, and Fe is the balance;
[0021] (2) Thermally oxidize the porous FeAlCr matrix tube at a temperature of 400 ° C for 100 h to form a dense in-situ oxidation layer; the in-situ oxidation layer is Al evenly wrapped on the surface of the porous FeAlCr matrix tube 2 o 3 membrane;
[0022] (3) Coating Al on the surface of the porous FeAlCr matrix tube after the in-situ oxidation layer was formed by the sol-gel method 2 o 3 , and ...
Embodiment 2
[0026] The preparation method of this embodiment is the same as that of Example 1, except that the porous FeAlCr matrix tube has a pore diameter of 17 μm and a relative air permeability of 55 m 3 / h·KPa·m 2 , the wall thickness is 0.8mm, and the tube length is 1000mm; the addition of the plasticizer is 5% of the total mass of Fe powder, Cr powder and Al powder; the mass percentage of Al in the porous FeAlCr matrix tube is 18%, The mass percent of Cr is 4%, and Fe is the balance; the method of described ceramic transition layer coating is chemical vapor deposition method or physical vapor deposition method, and the material of coating is TiO 2 , ZrO 2 or SiO 2 , or a nitride of Ti, Zr or Si, or a carbide of Ti, Zr or Si; the method for plating the palladium alloy is electroplating, magnetron sputtering or ion plating, and the palladium alloy plating is PdCu, PdAgAuNi, PdAgAu or PdY.
[0027] The hydrogen permeability rate of the palladium composite membrane based on porous ...
Embodiment 3
[0029] The preparation method of this example is the same as that of Example 1, except that the porous FeAlCr matrix tube has a pore diameter of 30 μm and a relative air permeability of 100 m3 / h·KPa·m 2 , the wall thickness is 0.6mm, and the tube length is 800mm; the addition of the plasticizer is 10% of the total mass of Fe powder, Cr powder and Al powder; the mass percentage of Al in the porous FeAlCr matrix tube is 30%, The mass percent of Cr is 2%, and Fe is the balance; the method for coating the ceramic transition layer is a chemical vapor deposition method or a physical vapor deposition method; the material for coating is TiO 2 , ZrO 2 or SiO 2 , or a nitride of Ti, Zr or Si, or a carbide of Ti, Zr or Si; the method for plating the palladium alloy is electroplating, magnetron sputtering or ion plating, and the palladium alloy plating is PdCu, PdAgAuNi, PdAgAu or PdY.
[0030] The hydrogen permeability rate of the palladium composite membrane based on porous FeAlCr p...
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