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Preparation method of full-ceramic microencapsulated fuel core block

A technology of fuel pellets and ceramic microparticles, which is applied in the fields of reactor fuel material, nuclear power generation, climate sustainability, etc., can solve the problems of low thermal conductivity of the matrix, poor safety guarantee of nuclear fuel, and poor fault tolerance performance.

Active Publication Date: 2018-07-06
CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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  • Application Information

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Problems solved by technology

Although it has been able to form a relatively mature application in years of development, there are still certain shortcomings under specific conditions of use, mainly in the low thermal conductivity of the matrix and poor fault tolerance in the event of an accident. Therefore, the safety of nuclear fuel poor security

Method used

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Embodiment Construction

[0031] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.

[0032] A kind of preparation method of all-ceramic microencapsulation fuel pellet of the present invention comprises the following steps:

[0033] Step 1, adding silicon carbide powder and sintering aid

[0034] Step 1.1, determine raw materials

[0035] The average particle size of silicon carbide powder is ≤1μm, and the specific surface area is ≥20m 2 / g;

[0036] The sintering aid is a mixture of alumina and rare earth element oxides, with an average particle size of 0.9-1.1 μm;

[0037] Specifically, there are two schemes for sintering aids: ①Alumina and Y 2 o 3 A mixture of alumina and Y 2 o 3 The mass ratio is one of 2:8, 4:6, 3:7; ②The sintering aid is alumina and Gd 2 o 3 A mixture of alumina and Gd 2 o 3 The mass ratio is one of 2:8, 4:6, 3:7;

[0038] Step 1.2, adding sintering aid

[0039] Add a sintering aid to the silic...

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Abstract

The invention belongs to the technical field of fuel core block preparation, and particularly relates to a preparation method of a full-ceramic microencapsulated fuel core block. The method comprisesthe following steps: step 1, adding a silicon carbide powder and a sintering aid; step 2, applying silicon carbide powder on the surface of the TRISO particles; step 3, pre-forming the fuel core block; step 4, performing hot-pressing sintering on the fuel core block. The full-ceramic microencapsulated fuel core block prepared by the method is in a cylindrical shape, and the density of the full-ceramic microencapsulated fuel core block is more than or equal to 3.1g / cm<3>; the inner TRISO particles of the core block are kept complete in structure and are uniformly distributed in the silicon carbide substrate.

Description

technical field [0001] The invention belongs to the technical field of fuel pellet preparation, and in particular relates to a preparation method of an all-ceramic microencapsulated fuel pellet. Background technique [0002] At present, uranium dioxide ceramic pellets are used as commercial nuclear power fuel. The main preparation method is to make ceramic pellets from uranium dioxide with a certain enrichment degree by powder metallurgy methods such as pressing, sintering, and shape grinding. Although it has been able to form a relatively mature application in years of development, there are still certain shortcomings under specific conditions of use, mainly in the low thermal conductivity of the matrix and poor fault tolerance in the event of an accident. Therefore, the safety of nuclear fuel The security is poor. [0003] As an important measure to improve the safety performance of nuclear power plants, the research and development of Accident Tolerant Fuel (ATF) is beco...

Claims

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Application Information

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IPC IPC(8): C04B35/565G21C3/64C04B35/645C04B35/628
CPCC04B35/565C04B35/62892C04B35/645C04B2235/3217C04B2235/3224C04B2235/3225C04B2235/77G21C3/64Y02E30/30
Inventor 刘文涛马渊刘业光魏东波孟莹赵瑞瑞
Owner CHINA NUCLEAR BAOTOU GUANGHUA CHEM IND
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