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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 the uniformity of components, low purity of lead-bismuth alloy, component segregation, etc., so as to avoid excessive component segregation and alloy High purity and uniform composition

Active Publication Date: 2018-07-06
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.

Method used

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  • High-purity bismuth-lead alloy and preparation method thereof
  • High-purity bismuth-lead alloy and preparation method thereof
  • High-purity bismuth-lead alloy and preparation method thereof

Examples

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Embodiment 1

[0036] The composition ratio of the bismuth-lead alloy prepared in the present embodiment is: by weight percentage, bismuth content is 55.4%, all the other are lead and unavoidable impurity, and its preparation method is as follows:

[0037] (1) Under the air environment, the lead material and the bismuth material are broken into blocks, and the lead and bismuth after crushing are blocks with a unilateral length of 20 to 40 mm, and the purity of the raw materials is 99.99%, wherein, by weight Percentage, Ag, Cu, Fe content ≤ 10ppm, other single impurity element content ≤ 5ppm, total impurity content < 100ppm, batching according to the design composition of Pb and Bi, configuring block bismuth and lead raw materials with a total weight of 100kg and mixing .

[0038] (2) Put the mixed ingredients into the magnesia ceramic crucible in the vacuum smelting furnace, then start the vacuum pump, evacuate the furnace to 0.1Pa and keep the vacuum degree during the whole smelting process...

Embodiment 2

[0047] The present embodiment prepares the composition ratio of bismuth-lead alloy to be: by weight percentage, bismuth content is 55.6%, and the rest is lead and unavoidable impurity, and its preparation method is as follows:

[0048] (1) Under the air environment, the lead material and the bismuth material are broken into blocks, and the lead and bismuth after crushing are blocks with a unilateral length of 20 to 40 mm, and the purity of the raw materials is 99.99%, wherein, by weight Percentage, Ag, Cu, Fe content ≤ 10ppm, other single impurity element content ≤ 5ppm, total impurity content < 100ppm, batching according to the design composition of Pb and Bi, configuring block bismuth and lead raw materials with a total weight of 100kg and mixing .

[0049] (2) Put the mixed ingredients into the magnesia ceramic crucible in the vacuum smelting furnace, then start the vacuum pump, evacuate the furnace to 1Pa and keep the vacuum degree during the whole smelting process, then h...

Embodiment 3

[0056] The composition design of present embodiment bismuth-lead alloy is: by weight percentage, bismuth content is 55.7%, all the other are lead and unavoidable impurity, and its preparation method is as follows:

[0057] (1) Under the air environment, the lead material and the bismuth material are broken into blocks, and the lead and bismuth after crushing are blocks with a unilateral length of 20 to 40 mm, and the purity of the raw materials is 99.99%, wherein, by weight Percentage, Ag, Cu, Fe content ≤ 10ppm, other single impurity element content ≤ 5ppm, total impurity content < 100ppm, weighed according to the above composition design, prepare block bismuth and lead raw materials with a total weight of 100kg and mix them.

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

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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 has a huge energy density and a mature industrial system, and it is the most likely substitute for fossil energy in today's society. Coolant for nuclear reactor is also called heat transfer agent, its function is to export the heat generated by nuclear reaction in the reactor. [0003] Commonly used coolants are divided into two types: gas and liquid, and liquid coolants include light water, heavy water and liquid metal. Liquid metal coolants include liquid sodium, lithium-lead alloys, and lead-bismuth alloys. Liquid lead-bismuth alloy has excellent thermal conductivity, strong heat-carrying capacity, rapid h...

Claims

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Application Information

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Patent Type & Authority Applications(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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