Palladium alloy infusible metal composite pipe and manufacture method thereof

A technology of refractory metal and palladium alloy, which is applied in the field of hydrogen permeable composite pipe preparation, can solve the problems of fast corrosion rate, difficult connection with other components, fragile and other problems, and achieves the effects of simple processing steps, improved hydrogen permeability and reasonable design.

Inactive Publication Date: 2010-06-09
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the reported research on palladium composite membranes, the disadvantages of ceramic supports are that they are fragile, not easy to seal, and difficult to connect with other parts, and the thermal expansion coefficients of ceramic supports and palladium membranes are quite different, and when the temperature changes too fast, it is easy to cause membrane rupture.
In response to these shortcomings, stainless steel sintered metal carrier has been paid attention to, but its hydrogen embrittlement resistance, high temperature resistance, corrosion resistance, etc. have caused new problems. hole stainless steel

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  • Palladium alloy infusible metal composite pipe and manufacture method thereof
  • Palladium alloy infusible metal composite pipe and manufacture method thereof
  • Palladium alloy infusible metal composite pipe and manufacture method thereof

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Effect test

Embodiment 1

[0044] In this embodiment, the prepared palladium alloy-refractory metal composite tube includes a refractory metal tube 2 made of a refractory metal material with hydrogen permeability and a palladium alloy inner tube arranged on the inside and outside of the refractory metal tube 2 1 and a palladium alloy outer tube 3, the palladium alloy inner tube 1, the refractory metal tube 2 and the palladium alloy outer tube 3 are coaxially arranged and the three are metallurgically combined to form a hydrogen permeable composite tube.

[0045] In this embodiment, when preparing the palladium alloy-refractory metal composite pipe, the following steps are included:

[0046] Step 1. Pipe preparation: determine the wall thickness and length of the palladium alloy inner pipe 1, refractory metal pipe 2 and palladium alloy outer pipe 3 according to the composite ratio. The palladium alloy inner tube 1 is a PdAg20 tube with a diameter of φ15×1mm, the refractory metal tube 2 is a niobium tube ...

Embodiment 2

[0063] In this embodiment, different from Embodiment 1, the composite ratio of the palladium alloy inner tube 1, the refractory metal tube 2 and the palladium alloy outer tube 3 is 2:4:1, and the palladium alloy outer tube 3 The thickness is 5 microns.

[0064] During actual preparation, the difference from Example 1 is that in step 2, the outer surface of the palladium alloy inner tube 1 prepared in step 1, the inner and outer surfaces of the refractory metal tube 2 and the inner surface of the palladium alloy outer tube 3 are respectively carried out. During the grinding process, the roughness of each treated surface reaches 0.3 μm. In step 3011, when the annealing treatment is performed before the explosion compounding, specifically when the refractory metal pipe 2 is annealed, the vacuum degree in the high temperature annealing furnace is 1×10 -2 Pa, the heating temperature is 800°C and the holding time is 90min; when the palladium alloy inner tube 1 and the palladium all...

Embodiment 3

[0066] In this embodiment, different from Embodiment 1, the composite ratio of the palladium alloy inner tube 1, the refractory metal tube 2 and the palladium alloy outer tube 3 is 5:30:3, and the palladium alloy outer tube 3 The thickness is 15 microns.

[0067] During actual preparation, the difference from Example 1 is that in step 2, the outer surface of the palladium alloy inner tube 1 prepared in step 1, the inner and outer surfaces of the refractory metal tube 2 and the inner surface of the palladium alloy outer tube 3 are respectively carried out. During the grinding process, the roughness of each treated surface reaches 0.8 μm. In step 3011, when the annealing treatment is performed before the explosion compounding, specifically when the refractory metal pipe 2 is annealed, the vacuum degree in the high-temperature annealing furnace is 9.9×10 -3 Pa, the heating temperature is 1200°C and the holding time is 30min; when the palladium alloy inner tube 1 and the palladiu...

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Abstract

The invention discloses a palladium alloy infusible metal composite pipe and a manufacture method thereof. The palladium alloy infusible metal composite pipe comprises an infusible metal pipe, a palladium alloy inner pipe and a palladium alloy outer pipe, wherein the infusible metal pipe has the hydrogen permeating capability and is made of infusible metal material; the palladium alloy inner pipe and the palladium alloy outer pipe are arranged inside and outside the infusible metal pipe; and the palladium alloy inner pipe, the infusible metal pipe and the palladium alloy outer pipe are coaxially arranged and carry out metallurgical bonding to form a hydrogen permeating composite pipe in the composite ratio of 2-5:4-30:1-3. The manufacture method comprises the following steps of: 1. preparing the pipes; 2. processing the surfaces of the pipes; 3. compounding by an explosion compounding method or a diffusion-welding compounding method and forming a composite pipe blank; and 4. mouldingthe composite pipe. The method has simple steps and convenient implementation, and the prepared palladium alloy infusible metal composite pipe has high performance, not only has the catalysis characteristic and oxidation resistance of palladium alloy on hydrogen, but also has high strength and high selective hydrogen permeation ratio of infusible metal.

Description

technical field [0001] The invention belongs to the technical field of hydrogen permeable composite pipe preparation, and in particular relates to a palladium alloy-refractory metal composite pipe and a preparation method thereof. Background technique [0002] The palladium alloy membrane diffusion method has excellent purification performance, which is unmatched by other hydrogen purification methods. However, due to technical reasons, there are still many problems to be solved in the palladium alloy membrane diffusion method, such as the low hydrogen permeation rate of the membrane, insufficient strength, and insufficient service life. At the same time, there are literatures that the hydrogen permeability rate is inversely proportional to the thickness of the palladium alloy film. The reduction of the palladium alloy film thickness can not only improve the hydrogen permeability rate, but also reduce the cost. At present, most of the research work on hydrogen permeable pal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L9/02B32B1/08
Inventor 姜婷马光田广民孙晓亮李银娥
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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