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A method for preparing neutron absorption plate by using hot isostatic pressing welding process

A technology of neutron absorbing plate and hot isostatic pressing, which is applied to other manufacturing equipment/tools, turbines, engine components, etc., can solve the problem of not being able to meet the needs of large-sized neutron absorbing plates, unable to prepare large-sized blanks, and affecting material quality and other issues, to achieve the effects of easy purchase, less defects, and low material requirements

Active Publication Date: 2017-06-27
安泰核原新材料科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method heats the composite material ingot to 700°C to melt the ingot and remove the molten impurities, but it is prone to pore defects and affects the quality of the material
When aluminum-based boron carbide blanks are produced by smelting technology, there are many defects and holes inside the blanks, and the current smelting technology and equipment can only produce aluminum-based boron carbide blanks with a length of less than 300mm, and cannot prepare large-sized blanks. Meet the needs of the nuclear industry for large-scale neutron absorbing plates

Method used

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  • A method for preparing neutron absorption plate by using hot isostatic pressing welding process
  • A method for preparing neutron absorption plate by using hot isostatic pressing welding process

Examples

Experimental program
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Effect test

Embodiment 1

[0033](1) Take a total of 10 kg of boron carbide powder with an average Fischer particle size of 5 μm and pure aluminum powder with a Fischer average particle size of 25 μm in a mass ratio of 25:75, and place them in a three-dimensional mixer with a ball-to-material ratio of 1.5 : 1, the mixing time is 6 hours, and the mixed powder obtained with Fischer's average particle size is 20 μm; the purity of the boron carbide powder and pure aluminum powder used is 99.8%;

[0034] (2) Put the mixed raw material, that is, the mixed powder, in a vacuum melting furnace for vacuum melting. The vacuum melting temperature is 680°C, the melting time is 3 hours, and the vacuum degree is -0.1MPa. During the melting process, the aluminum powder starts to melt. Stir, and stop stirring when the aluminum powder is completely melted, so that the melt is mixed evenly, and the melt is cooled after die casting to obtain a 20×60×200mm (thickness×width×length) aluminum-based boron carbide block;

[0035...

Embodiment 2

[0041] (1) Take boron carbide powder with an average Fischer particle size of 15 μm and pure aluminum powder with an average Fischer particle size of 15 μm in a mass ratio of 30:70 to take a total of 10 kg, and place them in a three-dimensional mixer with a ball-to-material ratio of 2 : 1, the mixing time is 6 hours, and the mixed powder obtained with Fischer's average particle size is 15 μm; the purity of the used boron carbide powder and pure aluminum powder is 99.8%;

[0042] (2) Put the mixed raw material, that is, the mixed powder, into a vacuum melting furnace for vacuum melting. The vacuum melting temperature is 690°C, the melting time is 3 hours, and the vacuum degree is -0.1MPa. During the melting process, the aluminum powder starts to melt. Stir, and stop stirring when the aluminum powder is completely melted, so that the melt is mixed evenly, and the melt is molded and cooled to obtain a 10×50×100mm (thickness×width×length) aluminum-based boron carbide block;

[004...

Embodiment 3

[0048] (1) Take a total of 20kg of boron carbide powder with an average Fischer particle size of 30 μm and pure aluminum powder with an average Fischer particle size of 40 μm at a mass ratio of 50:50, and place them in a three-dimensional mixer with a ball-to-material ratio of 2 : 1, the mixing time is 6 hours, and the mixed powder obtained with Fischer's average particle size is 35 μm; the purity of the used boron carbide powder and pure aluminum powder is 99.8%;

[0049] (2) Put the mixed raw material, that is, the mixed powder, into a vacuum melting furnace for vacuum melting. The vacuum melting temperature is 700°C, the melting time is 3 hours, and the vacuum degree is -0.1MPa. During the melting process, the aluminum powder starts to melt. Stir, and stop stirring when the aluminum powder is completely melted, so that the melt is mixed evenly, and the melt is cooled after die casting to obtain a 20×60×200mm (thickness×width×length) aluminum-based boron carbide block;

[00...

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Abstract

The invention discloses a method for preparing a neutron absorption plate through the hot isostatic pressing welding process. The method comprises the steps that firstly, boron carbide powder and aluminum powder serve as raw materials, and the raw materials are mixed evenly to obtain mixed powder; secondly, the mixed powder is subjected to vacuum melting and stirred evenly in the melting process, and aluminum-based boron carbide blocks with specified dimensions are obtained after the mixed powder is cooled; thirdly, the aluminum-based boron carbide blocks are placed into jackets, the space between the adjacent aluminum-based boron carbide blocks and the space between the aluminum-based boron carbide blocks and the inner sides of the jackets are both filled with the mixed powder, sealing welding is carried out after vacuum pumping is completed; fourthly, the jackets subjected to sealing welding are subjected to hot isostatic pressing treatment; and fifthly, large-size aluminum-based boron carbide materials are obtained directly, or the jackets on the outer sides of blanks subjected to hot isostatic pressing treatment are removed, and the large-size aluminum-based boron carbide materials are obtained after the blanks are subjected to rolling. By means of the method, holes and defects in the blanks obtained through the hot isostatic pressing welding process are decreased and even eliminated. The length of each blank ranges from 1.0 m to 6 m, the width of each blank ranges from 0.3 m to 0.5 m, and the thickness of each blank ranges from 3 mm to 20 mm.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal powder metallurgy and plate forming and strengthening methods, and particularly relates to a method for preparing an aluminum-based boron carbide neutron absorbing plate by using a hot isostatic pressing welding process. Background technique [0002] Boron carbide has a low density (2.5g / cm 3 ) and good neutron absorption capacity. A single boron carbide has low fracture toughness and is difficult to sinter densely. In order to improve the performance, metal-based boron carbide composites have emerged as the times require. Among them, aluminum-based boron carbide (B 4 C-Al) combines the high neutron absorption rate of boron carbide and the characteristics of light weight, corrosion resistance and ductility of aluminum, and has become the most widely used neutron absorbing material at present, and is widely used in high radioactive fuel and spent fuel in nuclear reactors and nuclear faci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/15B22F5/00
Inventor 王铁军刘国辉刘桂荣陈锦
Owner 安泰核原新材料科技有限公司
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