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Preparation method of annular thin-wall boron carbide-aluminum oxide pellets

A technology of boron carbide and alumina, which is applied in the field of preparation of thin-walled ring-shaped boron carbide alumina pellets, can solve the problems of high manufacturing difficulty and achieve high density and simple process

Inactive Publication Date: 2017-07-07
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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AI Technical Summary

Problems solved by technology

The length of the pellets ranges from 10mm to 51mm, and the wall thickness is only about 0.5mm, making it difficult to manufacture

Method used

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Experimental program
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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with specific embodiments.

[0019] A method for preparing a thin-walled ring-shaped boron carbide alumina core block according to the present invention comprises the following steps:

[0020] Step 1, ball milling mixture, Al 2 o 3 Powder and B 4 C powder needs to be dried before ball milling, and then Al 2 o 3 Powder and B 4 The C powder is mixed according to the mass ratio of 86:14, and then mixed with an appropriate amount of absolute ethanol and zirconia balls on a planetary ball mill at 480 rpm for 1 hour, and the slurry is taken out and placed in an oven for drying.

[0021] Step 2, binder addition, the binder system used in the experiment process is polypropylene (PP)-paraffin wax (PW)-stearic acid (SA), the mass ratio of PP, PW and SA in the binder is about 8%, 10% and 2%. The internal mixing of the powder and the binder is carried out in a double-roller internal mixer, and the tempera...

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Abstract

The invention belongs to the technical field of application of nuclear fuel pellets, and in particular relates to a method for preparing a thin-walled annular boron carbide alumina pellet. Dry Al2O3 powder and B4C powder, then mix Al2O3 powder and B4C powder according to the mass ratio of 86:14, then mix them with absolute ethanol and zirconia balls on a planetary ball mill, take out the slurry and put it in an oven Drying treatment; binder addition, the binder system is polypropylene-paraffin-stearic acid; put the aged material after banburying into the granulator to ensure the uniformity of the banburying material; The material is put into the injection molding machine to obtain the required thin-walled WABA green body; the degreasing process is divided into two stages; the pressed pellets are placed in the crucible and cooled with the furnace, and the cooled pellets are released from the furnace. The process of the invention is simple, and the domestic production capacity of B4C-Al2O3 pellets is prepared, and the localization of the pellets is realized.

Description

technical field [0001] The invention belongs to the technical field of application of nuclear fuel pellets, and in particular relates to a method for preparing a thin-walled annular boron carbide alumina pellet. Background technique [0002] Based on the comprehensive evaluation of burnable poison technology and the investigation and research on various absorber materials, Westinghouse began to conduct design research on WABA in the middle and late 1970s. In 1983, the U.S. Nuclear Regulatory Commission approved the WABA design. In the same year, the first batch of WABA was delivered and used. It is now in operation in many nuclear power plants. Compared with borosilicate glass / stainless steel, WABA has obvious advantages in nuclear performance: cladding The low parasitic absorption of the material improves the neutron economy, and the inner cavity of the rod increases the thermal neutron flux of the burnable poison cell, improves the effectiveness of the burnable poison, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/10C04B35/632C04B35/638
CPCC04B35/10C04B35/632C04B35/638C04B2235/3821C04B2235/6567
Inventor 郭洪宋希文刘文涛周芬何亚斌翟晶晶茹利利刘伟
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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