Palladium composite membrane taking multihole FeAlCr as substrate and preparation method thereof

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...