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Novel isotropic nuclear-grade graphite material and preparation method thereof

A technology of isotropic and graphite materials, applied in the field of graphite materials, can solve problems such as structural stability, different bonding methods, unfavorable nuclear-grade graphite, etc., and achieve the effect of sufficient sources, excellent isotropy, and favorable heat conduction

Inactive Publication Date: 2020-07-03
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the layered structure of graphite crystals, the combination of parallel to the lamellar direction and perpendicular to the lamellar direction is different, showing significant anisotropy
Therefore, artificial graphite is easy to produce preferred orientation in the production process, which is anisotropic in the macroscopic view. When the anisotropic nuclear grade graphite is irradiated, the irradiation life is shortened, and the dimensional changes in different directions are caused. The problem of structural stability is very unfavorable for the application of nuclear grade graphite, so it is necessary to use isotropic graphite

Method used

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  • Novel isotropic nuclear-grade graphite material and preparation method thereof
  • Novel isotropic nuclear-grade graphite material and preparation method thereof
  • Novel isotropic nuclear-grade graphite material and preparation method thereof

Examples

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Embodiment 1

[0053] In this implementation, the mass ratio of binder to aggregate is 0.3:1, and the aggregate is 100% spheroidized natural flake graphite, and the spheroidized natural flake graphite is a purified nuclear pure grade raw material, The fixed carbon content is 99.99%, the D50 particle size is 21.0μm, and the spheroidization degree is 0.85. The SEM image is as follows figure 1 As shown, it shows that the shape of natural flake graphite has been successfully transformed from flake to spherical after spheroidization treatment. The binder is modified asphalt with a softening point of 115°C.

[0054] The preparation method comprises the following steps:

[0055] (1) Spheroidization treatment: place natural flake graphite with a carbon content of 97% in a spheroidization classifier, and obtain a spheroidized graphite with a D50 of 21.0 μm and an average spheroidization degree of 0.85 after crushing, classification and spheroidization treatment. Natural flake graphite;

[0056] (2...

Embodiment 2

[0065] In this implementation, the mass ratio of binder to aggregate is 0.3:1, and the aggregate is a mixture of spheroidized natural flake graphite and petroleum coke, and the mass of spheroidized natural flake graphite and petroleum coke in the mixture The ratio is 1:1. The spheroidized natural flake graphite is a purified nuclear-grade raw material with a fixed carbon content of 99.99%, a D50 particle size of 20.0 μm, and a degree of spheroidization of 0.85. The fixed carbon content of the petroleum coke is 99.95%, boron (B) and gadolinium (Gd) are less than 1ppm, moisture ≤ 0.1%, sulfur ≤ 0.05%, particle size 15μm. The binder is modified asphalt with a softening point of 110°C.

[0066] The preparation method comprises the following steps:

[0067] (1) Spheroidization treatment: put natural flake graphite with a carbon content of 97% in a spheroidization classifier, and after crushing, grading and spheroidization treatment, obtain spheroidized natural flakes with a D50 of...

Embodiment 3

[0077] In this implementation, the mass ratio of binder to aggregate is 0.3:1, and the aggregate is a mixture of spheroidized natural flake graphite and natural microcrystalline graphite, and the spheroidized natural flake graphite and natural microcrystalline graphite in the mixture The mass ratio of crystalline graphite is 3:1, and the spheroidized natural flake graphite is a purified nuclear-grade raw material with a fixed carbon content of 99.99%, a D50 particle size of 15.0 μm, and a spheroidization degree of 0.7. The natural microcrystalline The fixed carbon content in graphite is 99.99%, and the particle size is 20 μm. The binder is modified asphalt with a softening point of 120°C.

[0078] The preparation method comprises the following steps:

[0079] (1) Purification: The raw material is natural flake graphite with a carbon content of 97%, which is purified by a continuous graphitization furnace at a high temperature, with a maximum temperature of 3000°C, and purifie...

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Abstract

The invention discloses a novel isotropic nuclear-grade graphite material and a preparation method thereof. The novel isotropic nuclear-grade graphite material is prepared by using spheroidized natural crystalline flake graphite as an aggregate, and the proportion of the spheroidized natural crystalline flake graphite in the aggregate is 50-100 wt%. The preparation method comprises the following steps: spheroidizing treatment, purification, mixing kneading, secondary crushing and screening, forming, primary roasting, dipping, secondary roasting, and graphitizing treatment. The isotropic nuclear-grade graphite material is prepared by spheroidizing natural crystalline flake graphite, has the characteristics of high density, high thermal conductivity, low expansion coefficient and excellent isotropy, and shows good application prospects in the fields of nuclear energy, thermal management, machinery, chemical engineering and the like.

Description

technical field [0001] The invention belongs to the technical field of graphite materials, and relates to a novel isotropic nuclear-grade graphite material obtained by using spheroidized natural flake graphite as a raw material and a preparation method thereof. [0002] technical background [0003] Graphite has the following excellent properties: (1) High neutron scattering cross-section and low neutron absorption cross-section, it is an excellent neutron moderator. (2) Good high temperature resistance and stable chemical properties. (3) High thermal conductivity and good radiation resistance. (4) The raw materials of artificial graphite, such as coke and natural graphite, are rich in sources and cheap in price, and are easy to produce various nuclear-grade graphites with high purity, high strength and different particle size requirements, so they are widely used in nuclear reactors. Especially in high-temperature gas-cooled reactors and molten salt reactors belonging to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/52C04B35/622
CPCC04B35/522C04B35/622C04B2235/602C04B2235/6562C04B2235/6567C04B2235/661C04B2235/77C04B2235/96C04B2235/9607
Inventor 申克徐昆曹欣磊
Owner HUNAN UNIV
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