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Method for preparing 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 composition segregation, oxygenation, and carburization, and achieve the effects of reducing oxygen content, inhibiting volatilization, and improving purity

Active Publication Date: 2012-01-04
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem of the present invention is to overcome the deficiencies of the prior art and provide a method for preparing a lead-bismuth alloy for nuclear reactors. The method prepares a high-purity lead-bismuth alloy, which solves the problems of increasing oxygen and carbon during alloy smelting, and solves the problem of Problems such as segregation of target product components have been solved, precise control of the main components of the alloy has been achieved, and lead-bismuth alloys with qualified components have been smelted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 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.

[0026] 1. Process the lead before smelting: put the raw material lead in a closed crucible, inject hydrogen gas with a purity of 99.99-99.999%, heat it to 550-750°C, and keep it warm for 5-8 hours;

[0027] 2. Passivate the crucible before melting: paint the crucible with a high-temperature-resistant sealing coating, place it in a muffle furnace and heat it to 800-1000°C, keep it warm for 30-50 minutes, and cool to room temperature;

[0028] 3. Before melting, the ingot mold is heated and baked to degas, and the baking temperature is 500-700°C;

[0029] 4. Dosing according to the design composition, pure lead is cold-packed in the crucible in the vacuum induction furnace, and bismuth is loaded into the alloy hopper;

[0030] 5. After evacuating to 2-8Pa, heat up to 450-550°C. After the lead is melted, fill...

Embodiment 2

[0034] 1. Process the lead before smelting: put the raw material lead in a closed crucible, inject hydrogen gas with a purity of 99.99%, heat it to 400-550°C, and keep it warm for 4-6 hours;

[0035] 2. Passivate the crucible before melting: paint the crucible with a high-temperature-resistant sealing coating, place it in a muffle furnace, heat it to 800-1000°C, keep it warm for 30-40 minutes, and cool to room temperature;

[0036] 3. The ingot mold is heated, baked and degassed before melting, and the baking temperature is 350-800°C;

[0037] 4. Dosing according to the design composition, pure lead is cold-packed in the crucible in the vacuum induction furnace, and bismuth is loaded into the alloy hopper;

[0038] 5. After evacuating to 6-10Pa, heat up to 400-550°C. After the lead is melted, fill it with high-purity argon and hydrogen mixed gas (hydrogen content 3-6v%) to 0.08-0.3MPa;

[0039] 6. After the lead is melted, add pure metal bismuth in batches through the hopper,...

Embodiment 3

[0042] 1. Process the lead before smelting: put the raw material lead in a closed crucible, inject hydrogen gas with a purity of 99.99%, heat it to 450-500°C, and keep it warm for 4 hours;

[0043] 2. Passivate the crucible before melting: paint the crucible with a high-temperature resistant sealing coating, place it in a muffle furnace and heat it to 800-900°C, keep it warm for 30-40 minutes, and cool to room temperature;

[0044] 3. The ingot mold is heated, baked and degassed before melting, and the baking temperature is 350-400°C;

[0045] 4. Dosing according to the design composition, pure lead is cold-packed in the crucible in the vacuum induction furnace, and bismuth is loaded into the alloy hopper;

[0046] 5. After evacuating to 0.1-2Pa, heat up to 450-500°C, and after the lead is melted, fill it with high-purity argon and hydrogen mixed gas (hydrogen content 3-5v%) to 0.03-0.05MPa;

[0047] 6. After the lead is melted, add pure metal bismuth in batches through the h...

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Abstract

The invention relates to a method for preparing a lead bismuth alloy for a nuclear reactor. In the method, the lead bismuth alloy is smelted by vacuum induction. The method comprises the following steps of: 1) putting lead serving as a raw material into a crucible in a glove box, heating to the temperature of between 450 and 800 DEG C, and introducing high-purity hydrogen for pretreatment; 2) passivating the crucible; 3) charging according to design ingredients, cooling the lead, putting into the crucible, and putting bismuth into a hopper; 4) introducing mixed gas of argon and the hydrogen under vacuum of between 0.1 and 10Pa until the mixed gas has the pressure of between 0.01 and 0.5Mpa, and melting at the temperature of between 400 and 600 DEG C, wherein the content of the hydrogen is between 2 and 7 volume percent; 5) adding the bismuth serving as a raw material in batch, and stirring in an electromagnetic and mechanical stirring combination mode; 6) detecting alloy ingredients by using a direct-reading spectrometer, and supplementing alloy elements according to a test result; and 7) pouring at the temperature of between 200 and 400 DEG C under the vacuum after the ingredients are qualified. By the method, the ingredients and purity of the produced lead bismuth alloy meet design requirements, and ingredient segregation and tissue segregation are prevented; the method is suitable for the nuclear reactor; and a process has the characteristics of short production time, high repeatability and low production cost and is easy to operate.

Description

technical field [0001] The invention belongs to the technical field of metal material processing, and 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 in the cooling system of nuclear reactors. It is a high-purity alloy and requires strict control of impurities. [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 such alloys has the following technical difficulties: inaccurate alloy composition control, oxygen increase during alloy smelting, ingot composition segregation, formation of peritectic or high melting point compounds, and harmful lead and bismuth produced during the production process. steam; In addition, if an unpassivated crucible is used, carburization or other impurities w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/03C22C11/08G21C3/07
CPCY02E30/40Y02E30/30
Inventor 徐敬尧黄群英高胜刘少军朱志强
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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