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Preparation method for palladium alloy small-diameter thin-walled capillary tube

A palladium alloy and capillary technology, which is applied in the field of palladium alloy thin-diameter and thin-walled capillary preparation, can solve the problems of palladium alloy capillary alloy composition stability, unsatisfactory wall thickness and length, high overall cost, and difficult processing, and achieve Excellent strength and hydrogen permeability, avoiding the effect of too low pipe strength and avoiding too much drawing force

Pending Publication Date: 2020-10-16
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 order to reduce the overall cost of the device and ensure reliability and life, it is often necessary to increase the hydrogen permeability of the palladium alloy capillary, adjust the alloy composition, reduce the capillary wall thickness, and increase the yield to improve the device efficiency; generally by controlling the capillary wall thickness, gas Tightness and quality improve the reliability and life of the device. Taking the above factors into consideration, the wall thickness of the palladium alloy capillary tubes that can be prepared at present are all above 0.1mm, and the yield and airtightness of the capillary tubes with thinner wall thickness are reported to be very low. To achieve the use on the device
[0004] In terms of material manufacturing and processing, due to the complex composition and structure of the palladium alloy, the hardness of the alloy ingot is high, the plasticity is poor, and the processing is very difficult. Using high-purity palladium powder and other added metal powders to prepare alloy ingots by mixing powders, there are problems such as easy burning of elements and difficult control of components, and some of them are melted ingots, drilled, rolled, drawn and combined. A small number of samples can be prepared by means of small processing rate multi-pass annealing, etc., but the process is complex, high energy consumption, low yield, high overall cost, and the stability of the alloy composition, wall thickness and length of the palladium alloy capillary obtained cannot meet the actual requirements. use requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment includes the following steps:

[0033] Step 1. The palladium alloy raw material is subjected to vacuum induction melting treatment, and then poured to obtain an electrode; the mass fraction of palladium in the palladium alloy raw material is 80%, and the mass fraction of silver is 20%; the mass fraction of the palladium is 99.95% % of palladium ingots, silver is silver ingots with a mass purity of 99.99%; the process of the vacuum induction melting process is: put the palladium alloy raw material into the crucible of the vacuum induction melting furnace, and then maintain a vacuum degree of 1.5 × 10 -2 Pa, heated to 1500°C and smelted for 10 minutes; the crucible is a magnesia crucible; the electrode is (cross-sectional diameter × height) cylindrical;

[0034] Step 2. The electrode obtained in step 1 is subjected to vacuum consumable arc melting treatment and diffusion annealing treatment successively to obtain an ingot; the vacuum consumable arc melti...

Embodiment 2

[0040] This embodiment includes the following steps:

[0041] Step 1. The palladium alloy raw material is subjected to vacuum induction melting treatment, and then poured to obtain an electrode; the mass fraction of palladium in the palladium alloy raw material is 75%, and the mass fraction of silver is 25%; the mass fraction of the palladium is 99.95% % of palladium ingots, silver is silver ingots with a mass purity of 99.99%; the process of the vacuum induction melting process is: put the palladium alloy raw material into the crucible of the vacuum induction melting furnace, and then maintain a vacuum degree of 1.7 × 10 -2 Pa, after heating to 1500°C, smelting for 12 minutes; the crucible is a magnesia crucible; the electrode is (cross-sectional diameter × height) cylindrical;

[0042] Step 2. The electrode obtained in step 1 is subjected to vacuum consumable arc melting treatment and diffusion annealing treatment successively to obtain an ingot; the vacuum consumable arc ...

Embodiment 3

[0048] This embodiment includes the following steps:

[0049] Step 1. The palladium alloy raw material is subjected to vacuum induction melting treatment, and then poured to obtain an electrode; the mass fraction of palladium in the palladium alloy raw material is 60%, and the mass fraction of copper is 40%; the mass fraction of the palladium is 99.95% % of palladium ingots, copper is copper ingots with a mass purity of 99.99%; the process of the vacuum induction melting process is: put the palladium alloy raw material into the crucible of the vacuum induction melting furnace, and then maintain a vacuum degree of 1.9 × 10 -2 Pa, after heating to 1550°C, smelting for 15 minutes; the crucible is a magnesia crucible; the electrode is (cross-sectional diameter × height) cylindrical;

[0050] Step 2. The electrode obtained in step 1 is subjected to vacuum consumable arc melting treatment and diffusion annealing treatment in sequence to obtain an ingot; the vacuum consumable arc m...

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Abstract

The invention discloses a preparation method for a palladium alloy small-diameter thin-walled capillary tube. The method comprises the following steps that 1, a palladium alloy raw material is subjected to vacuum induction melting and then poured to obtain an electrode; 2, the electrode is subjected to vacuum electric arc melting and diffusion annealing to obtain a cast ingot; 3, the cast ingot ismade into a pierced billet to obtain the pierced billet; 4, the pierced billet is extruded and straightened to obtain a tube blank; 5, the tube blank is rolled to obtain a semi-finished tube material; and 6, the semi-finished tube material is subjected to drawing to obtain the palladium alloy small-diameter thin-walled capillary tube. According to the preparation method, by controlling technologyparameters of duplex melting and diffusion annealing, atoms in the cast ingot are diffused, and it is ensured that the palladium alloy small-diameter thin-walled capillary tube is uniform in component and compact in structure; by controlling the size of the semi-finished tube material and collaborative optimization between the steps, the outer diameter and the wall thickness of the palladium alloy small-diameter thin-walled capillary tube are decreased, and production of the palladium alloy small-diameter thin-walled capillary tube which is high in precision, compactness and gas tightness isachieved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal processing, and in particular relates to a preparation method of a palladium alloy fine-diameter and thin-walled capillary. Background technique [0002] With the application of hydrogen in petroleum, chemical industry, metallurgy, glass, aerospace, new energy and other fields, the purity requirements of hydrogen are getting higher and higher; in the separation of tritium in fusion-fission hybrid reactors, the production of tritium in controllable nuclear fusion and Recycling involves the purification, extraction and separation of hydrogen and its isotopes. The main methods of hydrogen purification include catalytic method, metal hydride method, pressure swing adsorption method, low temperature separation method, palladium alloy membrane diffusion method, polymer membrane Due to its unique purification performance, the membrane diffusion method composed of palladium alloy capillary is unm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C5/04C22F1/14B21C37/06
CPCB21C37/06C22C1/02C22C5/04C22F1/14
Inventor 操齐高郑晶贾志华姜婷
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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