A kind of high-purity bismuth-lead alloy and preparation method thereof

A bismuth-lead alloy and high-purity technology, applied in the field of high-purity bismuth-lead alloy and its preparation, can solve the problems of inability to guarantee composition uniformity, low purity of lead-bismuth alloy, composition segregation, etc. The effect of uniform composition and precise control of alloy composition

Active Publication Date: 2020-06-02
安泰天龙钨钼科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the lead-bismuth alloy prepared by the traditional method has low purity and contains more metal oxides such as lead oxide and bismuth oxide, which cannot guarantee the uniformity of the composition, resulting in segregation of the composition, which is far from meeting the requirements for the nuclear industry.

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  • A kind of high-purity bismuth-lead alloy and preparation method thereof
  • A kind of high-purity bismuth-lead alloy and preparation method thereof
  • A kind of high-purity bismuth-lead alloy and preparation method thereof

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Embodiment 1

[0036] The composition ratio of the bismuth-lead alloy prepared in this embodiment is: by weight percentage, the bismuth content is 55.4%, and the rest is lead and inevitable impurities. The preparation method is as follows:

[0037] (1) In an air environment, crush the lead and bismuth materials into blocks. The crushed lead and bismuth are blocks with a unilateral length of 20-40mm. The purity of the raw materials is 99.99%. Among them, by weight Percentage, Ag, Cu, Fe content ≤10ppm, other single impurity element content ≤5ppm, total impurity content <100ppm, mix according to the design composition of Pb and Bi, configure and mix bulk bismuth and lead raw materials with a total weight of 100kg .

[0038] (2) Put the mixed ingredients into the magnesium oxide ceramic crucible in the vacuum melting furnace, then start the vacuum pump, vacuum the furnace to 0.1Pa and maintain the vacuum degree during the whole melting process, and then heat to control the melting temperature The t...

Embodiment 2

[0047] The composition ratio of the bismuth-lead alloy prepared in this embodiment is: by weight percentage, the bismuth content is 55.6%, and the rest is lead and inevitable impurities. The preparation method is as follows:

[0048] (1) In an air environment, crush the lead and bismuth materials into blocks. The crushed lead and bismuth are blocks with a unilateral length of 20-40mm. The purity of the raw materials is 99.99%. Among them, by weight Percentage, Ag, Cu, Fe content ≤10ppm, other single impurity element content ≤5ppm, total impurity content <100ppm, mix according to the design composition of Pb and Bi, configure and mix bulk bismuth and lead raw materials with a total weight of 100kg .

[0049] (2) Put the mixed ingredients into the magnesia ceramic crucible in the vacuum melting furnace, then start the vacuum pump, evacuate the furnace to 1 Pa and maintain the vacuum degree during the entire melting process, and then heat to control the melting temperature to At 1000...

Embodiment 3

[0056] The composition of the bismuth-lead alloy in this embodiment is designed as follows: according to weight percentage, the bismuth content is 55.7%, and the rest is lead and inevitable impurities. The preparation method is as follows:

[0057] (1) In an air environment, crush the lead and bismuth materials into blocks. The crushed lead and bismuth are blocks with a unilateral length of 20-40mm. The purity of the raw materials is 99.99%. Among them, by weight Percentage, Ag, Cu, Fe content ≤10ppm, other single impurity element content ≤5ppm, total impurity content <100ppm, weigh according to the above composition design, configure and mix lump bismuth and lead raw materials with a total weight of 100kg.

[0058] (2) Put the mixed ingredients into the magnesia ceramic crucible in the vacuum melting furnace, then start the vacuum pump, evacuate the furnace to 0.5Pa and maintain the vacuum degree during the entire melting process, and then heat to control the melting temperature T...

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Abstract

The invention discloses a high-purity bismuth-lead alloy and a preparation method thereof. The preparation method comprises the steps that a compounding step is carried out, specifically, according tothe composition design of the bismuth-lead alloy, massive lead materials and bismuth materials are used as raw materials for compounding and mixing; a smelting step is carried out, specifically, themixed raw materials are smelted under vacuum; a cooling step is carried out, specifically, alloy melt obtained after smelting is subjected to cooling; a filtering step is carried out, specifically, the alloy melt after cooling is subjected to filtration treatment; and a casting step is carried out, specifically, the filtered alloy molt is casted into a mold under vacuum and cooled to obtain an alloy ingot. According to the high-purity bismuth-lead alloy and the preparation method thereof, through the combination of high-temperature vacuum melting and low-temperature vacuum casting, oxides andother metal impurities in the lead and bismuth raw materials can be efficiently and advantageously removed, so that the purity of the alloy reaches above 99.998%. And through timing electromagnetic stirring and controlling of the weight of a single alloy ingot, the overall composition of the alloy is uniform and controllable, and the problem of excessive composition segregation is avoided.

Description

Technical field [0001] The invention relates to the field of liquid metal alloy materials, in particular to a high-purity bismuth-lead alloy and a preparation method thereof. The alloy is suitable for coolants and spallation targets in the nuclear industry. Background technique [0002] Energy is the basic element of the development of human society, and nuclear power, with its huge energy density and mature industrial system, is the most likely substitute for fossil energy in today's society. The coolant for nuclear reactors is also called heat carrier, and its role is to export the heat generated by the nuclear reaction in the reactor. [0003] Commonly used coolants are divided into two types: gas and liquid. Liquid coolants include light water, heavy water and liquid metal. Liquid metal coolants include liquid sodium, lithium-lead alloy and lead-bismuth alloy. Liquid lead-bismuth alloy has excellent thermal conductivity, strong heat-carrying capacity, rapid heat transfer, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C12/00C22C1/02
CPCC22C1/02C22C12/00
Inventor 陈福鸽姚惠龙刘桂荣刘国辉吕周晋翟一多
Owner 安泰天龙钨钼科技有限公司
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