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Method for preparing filter membrane of palladium-base alloy/aperture gradient Ti-Al intermetallic compound homogeneous support body for hydrogen separation

A technology of intermetallic compounds and palladium-based alloys, applied in chemical instruments and methods, semi-permeable membrane separation, membrane technology, etc., can solve problems such as high cost, difficult to weld components, non-uniform activation, etc., to improve oxidation resistance , excellent mechanical properties, the effect of prolonging the service life

Inactive Publication Date: 2005-07-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods used mainly include: preparation of carrier and transition membrane by solid particle sintering method; preparation of ultrafiltration and microfiltration membrane by sol-gel method; preparation of glass membrane by phase separation method; preparation of microporous membrane by chemical vapor deposition and electroless plating. , these methods are complex in process, high in cost, and difficult to control the pore size of the filter membrane; there are disadvantages such as the thermal expansion coefficient mismatch between the material and the palladium membrane, the non-uniform activation of the support surface, the hydrogen embrittlement of the metal, and the brittleness of the ceramic, which makes it difficult to weld and assemble.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Ti powder with a particle size of 100-150 μm and Al powder with a particle size of 50-100 μm are used for mixing according to the composition ratio of Ti-46.5at.% Al; then molded under a pressure of 200 MPa, and the Al foil is placed in the The end of the punch of the ordinary molding machine is made into a composite sheet blank with a diameter of 50mm and a thickness of 1-2mm; the reaction synthesis is carried out by vacuum pressureless sintering, and the vacuum degree is controlled at 1×10 -2 ~1×10 -3 Pa; the low-temperature pre-reaction temperature is 600°C, and the holding time is 60min; the high-temperature short-term reaction temperature is 1300°C, and the holding time is 20min; the cooling rate after the reaction is controlled at 40°C / min; the pore size of the TiAl intermetallic compound thus prepared The gradient homogeneous flaky support has a porosity of 40-45%, an open porosity of 30-35%, and has good oxidation resistance and corrosion resistance. Subsequent...

Embodiment 2

[0026] Ti powder with a particle size of 20-50 μm and Al powder with a particle size of 50-100 μm are used for mixing according to the composition ratio of Ti-48at.% Al; then cold isostatic pressing is used to form a tubular billet, and the Al foil is closely attached to the On the outside of the core rod, the taper of the core rod is 0.5°, and the pressure is 150MPa; after a small amount of machining, a composite tubular forming blank with an outer diameter of 30mm, an inner diameter of 28-29mm, and a height of 200mm is obtained; the sintering atmosphere is vacuum, and the vacuum degree Controlled at 1×10 -2 ~1×10 -3 Pa; the low-temperature pre-reaction temperature is 620°C, and the holding time is 40min; the high-temperature short-term reaction temperature is 1260°C, and the holding time is 30min; Intermetallic compound pore size gradient homogeneous tubular support. Subsequently, a layer of palladium-based alloy film was evenly plated on the surface of the prepared TiAl i...

Embodiment 3

[0028] Ti powder with a particle size of 150-200μm and Al powder with a particle size of 20-50μm are used for mixing according to the composition ratio of Ti-48.5at.%Al; molded under a pressure of 200MPa to make a diameter of 50mm and a thickness of The 1-2mm flake billet is then made into a composite billet by immersing the surface of Al liquid, the immersion temperature is 700°C, and the immersion time is 2min; the sintering adopts low-pressure hot isostatic pressing, the atmosphere is Ar gas, and the pressure is 0.1MPa, the low-temperature pre-reaction temperature is 620°C, and the holding time is 40min; the high-temperature short-time reaction temperature is 1300°C, and the holding time is 10min. After the reaction is completed, the cooling rate is controlled at 20°C / min; the thus prepared TiAl intermetallic compound pore size gradient homogeneous sheet-like support has a porosity of 35-40%, an open porosity of 25-35%, and a good Oxidation resistance and corrosion resistan...

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Abstract

The present invention relates to production of semipermeable membrane, and relates to a special preparation method of semipermeable membrane for separation process. It utilizes die pressing or isostatic cool pressing process to make Ti and Al element powder be directly combined with Ti foil or Al foil and formed into sheet blank or tubular blank, or first utilizes die pressing or isostatic cool pressing processto make Ti and Al element powder be formed into sheet blank or tubular blank, then utilizes Al liquid surface melt-dipping mode to obtani composite formed blank; then utilizes low-temperature preparation and high-temperature short-term reaction two-stage vacuum sintering synthesizing method to prepare TiAl intermetallic compound pore diameter gradient homogeneous supporting body, then adopts CVD or PVD mode to uniformly plate a layer of palladium-based alloy membrane whose thickness is 5-50 micrometers on its surface.

Description

Technical field: [0001] The invention relates to the production of a semi-permeable membrane, a special preparation method for the semi-permeable membrane used in a separation process, and a preparation method for preparing a filter membrane of a hydrogen separation palladium-based alloy and a TiAl intermetallic compound homogeneous support body with a pore size gradient. Background technique: [0002] Membrane separation technology is driven by external energy or chemical potential difference to separate, classify, purify and enrich the gas or liquid mixed with two or more components. Most of the process has no phase change, and it has high efficiency, energy saving, With the advantages of simple process, less investment and less pollution, it is widely used in various production and research departments of the national economy and in the field of national defense construction. In the field of gas membrane separation, the most widely used is the separation and recovery of h...

Claims

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Application Information

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IPC IPC(8): B01D69/10B01D71/02
Inventor 贺跃辉江垚林小芹汤义武徐南平高海燕张启修
Owner CENT SOUTH UNIV
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