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
CN111362698AInactive Publication Date: 2020-07-03HUNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUNAN UNIV
Publication Date
2020-07-03
Estimated Expiration
Not applicable · inactive patent

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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.
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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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