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

Active Publication Date: 2012-12-19
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, element diffusion exists between the porous stainless steel and the palladium composite membrane at high temperature, which reduces the hydrogen permeation rate of the palladium composite membrane and shortens the service life of the palladium composite membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a palladium composite membrane taking multihole FeAlCr as substrate and a preparation method thereof. The palladium composite membrane is composed of a multihole FeAlCr substrate tube, a home position oxidation layer, a ceramic transition layer and palladium alloy membrane. The preparation process thereof includes the following steps: firstly, a multihole FeAlCr substrate tube is prepared; secondly, home position oxidation is adopted to form a dense home position oxidation layer on the surface of the multihole FeAlCr substrate tube; thirdly, a ceramic transition layer is coated; fourthly, palladium alloy is coated on the surface of the multihole FeAlCr substrate tube provided with the ceramic transition layer, and heat treatment is carried out, so as to form palladium alloy membrane, thus obtaining the palladium composite membrane. The preparation process of the invention is simple, and design is reasonable. The palladium composite membrane which takes multihole FeAlCr as substrate and is prepared by adopting the invention has high hydrogen permeability, strong hydrogen corrosion resistance and long service life, can be effectively applied to purification and separation of hydrogen and is especially applied to purification and separation of hydrogen isotope.

Description

technical field [0001] The invention belongs to the technical field of purification and separation of hydrogen and its isotopes, and in particular relates to a palladium composite membrane with porous FeAlCr as a matrix and a preparation method thereof. Background technique [0002] The key element for the purification and separation of hydrogen and its isotopes is palladium and its alloy membrane separation material. At present, the membrane separation material used at home and abroad is a dense palladium alloy thin-walled tube. The thin-walled tube has problems such as low hydrogen permeation rate and high cost during use, which has been difficult to meet the application requirements. The palladium composite film formed by the palladium alloy film attached to the surface of the porous material can greatly increase the hydrogen permeation rate, reduce the amount of metal palladium, reduce the cost of materials, and effectively improve production efficiency and safety while...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/02
Inventor 康新婷汤慧萍王培汪强兵池煜頔李广忠李亚宁葛渊谈萍杨保军王建永朱纪磊陈金妹
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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