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A kind of solid target sheet for spallation neutron source and preparation method thereof

A spallation neutron source and solid target technology, applied in the field of metal welding, can solve the problems of low connection strength between tantalum coating and tungsten, the welding cannot meet the requirements, the tantalum coating is not dense enough, etc., so as to enhance the anti-erosion corrosion performance. , Improve life, the effect of tantalum coating densification

Active Publication Date: 2018-02-23
INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since tantalum and tungsten are metals with high melting points, and the welding between tungsten block and tantalum plate involves surface-to-surface welding, which increases the difficulty of welding, and conventional welding cannot meet the requirements.
[0004] The existing tungsten-tantalum welding method is to pass a transition metal, such as nickel alloy, between the tungsten block and the tantalum plate, and use brazing to weld, but this welding method requires the introduction of transition alloys
There is also a method of plasma spraying tantalum on the surface of tungsten block, but the obtained tantalum coating is not dense enough, and the connection strength between tantalum coating and tungsten is not high.

Method used

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  • A kind of solid target sheet for spallation neutron source and preparation method thereof
  • A kind of solid target sheet for spallation neutron source and preparation method thereof
  • A kind of solid target sheet for spallation neutron source and preparation method thereof

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Embodiment 1

[0021] refer to figure 1 , is a flowchart of a method for preparing a solid target for a spallation neutron source provided by an embodiment of the present invention, and this embodiment may specifically include the following steps:

[0022] Step 100, cleaning the tungsten block and the tantalum plate to be welded. Before welding, the surface of the tungsten block and tantalum plate to be welded is cleaned, the purpose is to make the surface of the tungsten block and tantalum plate clean and ready for subsequent welding. Keeping the surface of the tungsten block and tantalum plate to be welded clean can improve the welding quality and make the tungsten block and tantalum plate fit better after welding.

[0023] In a preferred embodiment of the present invention, the surfaces of the tungsten block and the tantalum plate to be welded can be cleaned with a weak acid, and then ultrasonicated with acetone again after cleaning, and then dried.

[0024] In a preferred embodiment of...

Embodiment 2

[0037] refer to Figure 4 , is a flowchart of a method for preparing a solid target for a spallation neutron source provided by an embodiment of the present invention, and this embodiment may specifically include the following steps:

[0038] Step 200, select a tungsten block with a size of 170*70*25mm, a density of 18.7g / cm3 and a polished surface after being sintered and forged, as the tungsten block to be welded.

[0039]Step 201 , according to the size of each surface of the tungsten block to be welded, six high-purity tantalum plates with a thickness of 0.4-2 mm are processed as the tantalum plates to be welded. It should be noted that the thinner the thickness of the tantalum plate, the smaller the afterheat. Therefore, if the processing conditions permit, the thinner tantalum plate can be processed as much as possible.

[0040] Step 202, cleaning the surface of the tungsten block and the tantalum plate with weak acid, cleaning and drying. The purpose of this step is t...

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Abstract

The invention provides a solid target piece for a spallation neutron source and a preparation method thereof, which are used to enhance the connection strength between tantalum and tungsten in the target piece and improve the service life of the target piece. Among them, a method for preparing a solid target for a spallation neutron source, comprising: cleaning the tungsten block and the tantalum plate to be welded; attaching the tantalum plate to the six faces of the tungsten block to form a tungsten block A tantalum box; sealing and welding the tantalum box; putting the sealed and welded tantalum box into a hot isostatic pressing furnace for hot isostatic pressing and taking it out to obtain a target piece. The preparation method of the solid target for the spallation neutron source provided by the present invention does not introduce other transition metals, and directly diffuses and connects the tantalum plate and the tungsten block in a large area, so that the tantalum and tungsten in the prepared target can achieve metallurgical bonding and the bonding strength High, dense tantalum coating, which enhances the anti-erosion corrosion performance of the target and improves the life of the target.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a solid target for a spallation neutron source and a preparation method thereof. Background technique [0002] The China Spallation Neutron Source uses metal tungsten as the target material. When high-energy protons bombard the tungsten block to generate neutrons, a large amount of heat will be generated. In order to operate efficiently and stably, the tungsten target needs to be cooled. However, under strong irradiation and water flow, the tungsten block will crack, which will affect the life of the tungsten target. In order to enhance the erosion corrosion resistance of the tungsten target, it is necessary to coat the six sides of the tungsten block with a layer of metal tantalum with strong corrosion resistance and high atomic number. [0003] Since both tantalum and tungsten are metals with high melting points, and the welding of tungsten block and tantalum plate invol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05H6/00
Inventor 纪全魏少红张锐强贾学军
Owner INST OF HIGH ENERGY PHYSICS CHINESE ACAD OF SCI
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