A kind of preparation method of lead-bismuth alloy for nuclear reactor

A lead-bismuth alloy and nuclear reactor technology, applied in the field of metal material processing, can solve problems such as inaccurate control of alloy composition, high melting point compounds or peritectics, and achieve the effects of eliminating macro segregation, reducing gravity segregation, and fully uniform contact

Active Publication Date: 2016-08-24
ANHUI SCI & TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a preparation method of lead-bismuth alloy for nuclear reactors, thoroughly solve the problems of inaccurate control of the composition of the alloy, the formation of high melting point compounds or peritectics, etc., and solve the problem of increasing oxygen during the alloy smelting process. Problems and gravity segregation of bismuth elements to ensure the uniformity of bismuth content and smelt lead-bismuth alloys with qualified components

Method used

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Experimental program
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Effect test

Embodiment 1

[0027] By adopting the process of the present invention, a qualified lead-bismuth alloy is prepared, and the specific smelting and preparation process flow is as follows.

[0028] (1) Before smelting, the used argon (99.99%) is treated with impurities such as dehydration and deoxygenation.

[0029] (2) Select high-purity bismuth and high-purity lead as raw materials, process the raw materials Pb and Bi into powder respectively in a high-purity argon environment, and the particle size: Pb is 80 mesh, Bi is 50 mesh.

[0030] (3) Pb and Bi solid powder are fully mixed: batching is carried out according to the design composition of Bi and Pb, Bi powder and Pb powder enter the mixing tank in batches through their respective feeding hoppers for mixing, mechanically stir for 20 minutes, Bi powder and Pb powder Mix well by contact.

[0031] (4) Clean the melting furnace and casting mold before melting: heat the melting furnace to 400°C, evacuate to 1Pa, keep it for 5 minutes, fill it...

Embodiment 2

[0037] (1) Before smelting, the used argon (99.999%) is treated with impurities such as dehydration and deoxygenation.

[0038] (2) Select high-purity bismuth and high-purity lead as raw materials, process the raw materials Pb and Bi into powder respectively in a high-purity argon environment, and the particle size: Pb is 200 mesh, Bi is 150 mesh.

[0039] (3) Pb and Bi solid powder are fully mixed: batching is carried out according to the design composition of Bi and Pb, Bi powder and Pb powder enter the mixing tank in batches through their respective feeding hoppers for mixing, mechanically stir for 30 minutes, Bi powder and Pb powder Mix well by contact.

[0040] (4) Clean the melting furnace and mold: heat the melting furnace to 500°C, vacuumize to 2Pa, keep for 3-5 minutes, fill in 0.3MPa high-purity argon, keep for 4-6 minutes; then vacuumize to 1Pa, keep for 3-5 minutes -5 minutes, fill with 0.3MPa high-purity argon gas, and keep it for 4-6 minutes; repeat 2 times, rem...

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Abstract

The invention discloses a preparation method for lead bismuth alloy used by a nuclear reactor. According to the method, in the high-purity argon atmosphere, high-purity lead and high-purity bismuth are used as raw materials, a complete mixing treatment process of lead powder and bismuth powder is adopted before melting, and a continuous electromagnetic stirring and a feeding process in batches are adopted in the smelting process, so as to ensure full mixing of main ingredients and process safety; a melting furnace and a casting mould are cleaned before use, so that the introduction of the impurities is reduced, and the purity of a target product is improved. Since the unique casting mold is adopted, the gravity segregation of the bismuth element is reduced, the uniformity of the bismuth content is ensured, and high-quality lead bismuth alloy can be prepared.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and in particular relates to a preparation method of a lead-bismuth alloy suitable for nuclear reactors. Background technique [0002] Lead-bismuth alloy is a metal alloy used as a liquid metal heat transfer agent in the cooling system of nuclear reactors. It is irradiated by neutrons in nuclear reactors and requires strict control of impurities, otherwise radioactive products are likely to be produced. It belongs to high-purity alloys. [0003] The research on the preparation of high-purity lead-bismuth alloys has been carried out at home and abroad, but they all stay at the laboratory scale or semi-industrial scale. The existing metallurgical technology for smelting this type of alloy has the following technical difficulties: inaccurate control of alloy composition, formation of high-melting point compounds, oxygen addition during alloy smelting, segregation of ingot component...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C11/08C22C1/02B22D7/06G21C21/16
CPCY02E30/30
Inventor 章毛连许万祥张永锋秦炎福冯婕何恩节李勇刘念王娜黄群英吴宜灿
Owner ANHUI SCI & TECH UNIV
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