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Graphite material, and raw material composition, preparation method and application thereof

A raw material composition and graphite material technology, applied in the field of graphite materials, can solve the problems of complex preparation process, low compressive strength, large average pore size and the like, and achieve the effects of simple preparation process, high compressive strength and small pore size

Active Publication Date: 2016-12-21
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a graphite material, its raw material composition, its preparation method and its use in order to overcome the defects of existing graphite materials such as large average pore size, low compressive strength and complicated preparation process.

Method used

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  • Graphite material, and raw material composition, preparation method and application thereof
  • Graphite material, and raw material composition, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 A kind of preparation method of graphite material

[0045] (1) Taking 64% of natural flake graphite, 10% of artificial graphite, 20% of phenolic resin binder and 6% of mesophase carbon microspheres as raw materials by mass percentage, through kneading, extruding, crushing and sieving and other processes to prepare matrix graphite powder;

[0046] (2) The SH (Semihydrostatiche pressverfahren) quasi-isostatic pressing method is used to press the spherical green body. The matrix graphite powder obtained in step (1) is added into a silica gel mold for quasi-isostatic pressing. When pressed by 100MPa, quasi-isotropic pressure is generated in the cavity of the silicone mold, so that the raw material powder in the ellipsoid cavity is pressed into a sphere.

[0047] (3) Carbonizing and purifying the green body in step (2) to obtain graphite material.

Embodiment 2

[0048] Embodiment 2 The preparation of the fuel element with the fuel layer in the innermost layer

[0049] (1) Using SH method quasi-isostatic pressing process, the mixture of coated fuel particles and mesophase carbon microspheres is pressed into a spherical shape, and the pressing pressure is 100 MPa. Obtain a spherical fuel layer (A);

[0050] (2) Using the quasi-isostatic pressing process again, the fuel layer (A) is packed into the fuel-free layer (B) raw material, and the pressing pressure is 100 MPa. The raw material of layer (B) is mesophase carbon microspheres. The sample (AB) was obtained and carbonized at 800°C; the heating rate was 1°C / min, and the temperature was maintained at 800°C for 1 hour.

[0051] (3) Using the quasi-isostatic pressing process again, the sample (AB) obtained in step (2) is packed into the shell layer (C) raw material, and the pressing pressure is 250 MPa. (C) Layer raw materials are 64% natural flake graphite, 10% artificial graphite, 20%...

Embodiment 3

[0053] The fuel element of diameter 6cm that embodiment 3 makes

[0054] A fuel element with a diameter of 6 cm was obtained with reference to the preparation method of Example 2, and its main parameters are shown in Table 1:

[0055] Table 1

[0056]

[0057] The average pore diameter of the shell layer of the fuel element prepared in this embodiment is 500 nm, and the compressive strength of the shell layer is 60 MPa.

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Abstract

The invention discloses a graphite material, and a raw material composition, a preparation method and an application thereof. The graphite material provided by the invention comprises the following raw materials: natural flake graphite, artificial graphite and mesocarbon microbeads. The preparation method for the graphite material comprises the following steps: (1) subjecting raw materials to uniform mixing so as to obtain matrix graphite powder; (2) pressing the matrix graphite powder so as to obtain a green body; and (3) subjecting the green body to carbonization and purification so as to obtain the graphite material. The graphite material provided by the invention has small average pore size, high compressive strength, high thermal conductivity, low thermal expansion coefficient and low anisotropy degree, and is applicable to being used as a matrix material and an outer shell material of a fuel bed of a fuel element in a reactor; meanwhile, the graphite material has the advantages of simple preparation process and low cost.

Description

technical field [0001] The invention relates to a graphite material, its raw material composition, its preparation method and its application. Background technique [0002] The preparation process of traditional graphite materials is many and the process is complicated. Generally, carbon aggregate (such as artificial graphite, natural graphite, etc.) and binder are used as raw materials and mixed in a certain proportion. After kneading, extruding, crushing and sieving, the powder raw material is first obtained. Then, the powder raw material is molded or isostatically pressed (or quasi-isostatically pressed) to obtain a green body. Then, according to the actual heat treatment requirements, the green body is subjected to carbonization treatment and further graphitization treatment to obtain the desired product. [0003] Spherical fuel element matrix graphite for high temperature gas-cooled reactors, the raw materials are 64% natural flake graphite, 16% artificial graphite a...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 仲亚娟林俊姜海涛朱智勇
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI