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Method for preparing high-purity niobium wire for nuclear fuel from general industrial niobium rod as raw material

An industrial and nuclear fuel technology, applied in the direction of electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve the problems of affecting wire drawing, increasing processing costs, inclusions, folding, etc., to increase the straightening of finished products, prevent High temperature oxygen absorption, the effect of promoting volatilization

Active Publication Date: 2018-03-16
西安诺博尔稀贵金属材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of traditional preparation process has the following disadvantages: if forging is used to open the blank, ordinary forging hammer die forging cannot guarantee the surface quality during the forging process, and it is easy to form a large number of forging defects such as inclusions and folding. In addition, if a precision forging machine is used, the cost is higher In addition, the surface is also easy to form a large number of folds and other defects. The above two forging blanking methods are likely to cause uneven surface and core structures of the forged billet. Based on the heredity of material processing, it will directly affect the subsequent wire drawing. ; The forged rod is rolled to obtain thin niobium rods. During the rolling process, rolling defects such as ears are easy to form. If they are not eliminated in time, defects such as folding will be formed and directly affect the subsequent wire drawing; traditional niobium and In the preparation process of niobium alloy wire, after repeated vacuum annealing, on the one hand, the content of gas impurity elements such as O will increase excessively, on the other hand, the process will be lengthened and the processing cost will be increased. Considering the safety of nuclear power, nuclear grade The content of impurity elements in the material needs to be strictly controlled, and the risk of unnecessary increase in impurity content should be avoided as far as possible. Therefore, it is not advisable to produce nuclear niobium wires by multiple firing processes; Surface treatment is only simple treatment such as pickling and cleaning agent washing, which cannot remove surface oxides and impurities. Such treatments will directly affect the surface quality and impurity content of the finished wire.

Method used

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  • Method for preparing high-purity niobium wire for nuclear fuel from general industrial niobium rod as raw material
  • Method for preparing high-purity niobium wire for nuclear fuel from general industrial niobium rod as raw material
  • Method for preparing high-purity niobium wire for nuclear fuel from general industrial niobium rod as raw material

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Experimental program
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Embodiment 1

[0033] In this embodiment, the high-purity niobium wire for nuclear fuel is prepared as a raw material with general industrial niobium bars, which contain impurities: C, N, H, O, Si, P, and the proportion of each impurity in the niobium bars The mass percentages are: C 0.005%-0.02%, N 0.02%-0.05%, H 0.001%-0.003%, O 0.1%-0.3%, Si 0.001%-0.003%, P 0.006%-0.008%. The specific preparation method of the high-purity niobium wire for nuclear fuel comprises the following steps:

[0034] Step 1. Electron beam smelting is carried out to the niobium bar by using an electron beam smelting furnace. The specific smelting process is shown in Table 1, thereby obtaining an ingot with a circular cross-sectional shape and a cross-sectional diameter of 70mm. After testing, the ingot contains the following mass content Composition: W≤100ppm, Ta≤200ppm, C≤50ppm, N≤70ppm, H≤5ppm, O≤50ppm;

[0035] Table 1 Example 1 Smelting Process Parameters

[0036]

[0037]

[0038] Step 2, using a lathe...

Embodiment 2

[0051] In this embodiment, the high-purity niobium wire for nuclear fuel is prepared as a raw material with general industrial niobium bars, which contain impurities: C, N, H, O, Si, P, and the proportion of each impurity in the niobium bars The mass percentages are: C 0.005%-0.02%, N 0.02%-0.05%, H 0.001%-0.003%, O 0.1%-0.3%, Si 0.001%-0.003%, P 0.006%-0.01%. The specific preparation method of the high-purity niobium wire for nuclear fuel comprises the following steps:

[0052] Step 1, adopt electron beam smelting furnace (300kW as example) to carry out electron beam smelting to niobium bar, specific smelting process is shown in Table 1, obtain the ingot that cross-sectional shape is circular, cross-sectional diameter is 90mm, after testing this ingot contains Components with the following mass content: W≤100ppm, Ta≤200ppm, C≤50ppm, N≤70ppm, H≤5ppm, O≤50ppm;

[0053] Step 2, using a lathe to carry out turning processing on the ingot described in step 1, the depth of turning ...

Embodiment 3

[0066] In this embodiment, the high-purity niobium wire for nuclear fuel is prepared as a raw material with general industrial niobium bars, which contain impurities: C, N, H, O, Si, P, and the proportion of each impurity in the niobium bars The mass percentages are: C 0.005%-0.02%, N 0.02%-0.05%, H 0.004%-0.005%, O 0.1%-0.3%, Si 0.001%-0.003%, P 0.001%-0.008%. The specific preparation method of the high-purity niobium wire for nuclear fuel comprises the following steps:

[0067] Step 1, adopt electron beam smelting furnace (300kW as example) to carry out electron beam smelting to niobium bar, specific smelting process is shown in Table 1, obtain the ingot that cross-sectional shape is circular, cross-sectional diameter is 90mm, after testing this ingot contains Components with the following mass content: W≤100ppm, Ta≤200ppm, C≤50ppm, N≤70ppm, H≤5ppm, O≤50ppm;

[0068] Step 2, using a lathe to carry out turning processing on the ingot described in step 1, the depth of turning...

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Abstract

The invention provides a method for preparing high-purity niobium wire for nuclear fuel using niobium bars for general industrial use as raw materials, which includes the following steps: 1. Electron beam melting of niobium bars for general industrial use to obtain ingots; 2. Turning processing; 3. Extrusion, to obtain the extruded bar blank; 4. Carry out the first stage annealing treatment after turning; 5. Rotating, to obtain the swaged bar blank; 6. Carry out the second stage annealing treatment, and then perform surface sanding to obtain Sanding the rod blank; 7. Roller die stretching to obtain a rough wire material; 8. After surface treatment, perform fixed mold stretching and shaping to obtain semi-finished wire material; 9. After surface treatment, straighten to obtain a diameter of 1.5mm~ 3.0mm, high purity niobium wire for nuclear fuel with straightness <3mm / m. The invention has fewer heat treatment fires, less hot processing, and a high yield. The size, surface inspection, and composition of the high-purity niobium wire prepared by this method all meet the requirements for nuclear-grade materials, and can be directly used for the preparation of uranium-niobium alloys for nuclear fuel.

Description

technical field [0001] The invention belongs to the technical field of material processing, and in particular relates to a method for preparing high-purity niobium wire for nuclear fuel by using general industrial niobium bars as raw materials. Background technique [0002] Metal niobium is a rare metal with a high melting point. It is not only a good structural material, but also a special functional material, which can be widely used in metallurgy, chemical industry, aerospace and atomic energy and other fields. Niobium has a low neutron capture cross section, good thermal conductivity, and high thermal strength, making it a very suitable material for atomic energy reactors. With the development of science and technology and the progress of society in our country, the development and utilization value of nuclear industry, especially nuclear energy, has become more and more significant, and metal niobium has also been more widely used in the field of atomic energy. Metal u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B21C37/04C22F1/18C25D11/26C22B9/22C22B34/24
CPCC22B9/228C22B34/24C22F1/18C25D11/26B21C37/047Y02E30/30
Inventor 刘倚天武宇郝小雷赵鸿磊姚修楠于乐庆张锟宇惠红卫韩吉庆
Owner 西安诺博尔稀贵金属材料股份有限公司
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