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High-strength and high-toughness graphite and preparation method thereof

A high-toughness, high-strength technology, applied in the field of high-strength and high-toughness graphite and its preparation, can solve the problems of low strength, low toughness, high transportation risk, etc., and achieve the effect of increasing density, strength and toughness

Pending Publication Date: 2022-05-27
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its own low strength and low toughness, graphite is not easy to produce and process large-scale graphite components, and the transportation risk is also relatively high

Method used

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  • High-strength and high-toughness graphite and preparation method thereof
  • High-strength and high-toughness graphite and preparation method thereof
  • High-strength and high-toughness graphite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] Prepare pitch coke and carbon chopped fibers in a mass ratio of 92:8, pour them into a conical mixer, and mix them thoroughly for 1 hour, then take them out.

[0092] Pour the uniformly mixed powder raw materials into a double-shaft stirring kneader with a Z-shaped reamer, and heat up while stirring. When the temperature rose to 180°C, the molten coal pitch was added to the kneader. The mass ratio of powder raw material (pitch coke + chopped fiber) to coal pitch was 65:35. After stirring at a constant temperature of 180°C for 2 hours, the heating was stopped, and the mixed paste was taken out.

[0093] After the paste is cooled, use a small mechanical pulverizer to pulverize it, and the pulverized powder passes through a 150-mesh sieve. The sieved powder was loaded into a rubber mold with an inner diameter of 28 mm and a height of 300 mm and compacted. The loaded mold is sealed and placed in a cold isostatic press for molding, with a pressurizing pressure of 150 MPa a...

Embodiment 2

[0097] Compared with Example 1, except the carbonization process is different, the rest are the same. Only the carbonization process will be described below, and other steps refer to Example 1.

[0098] One carbonization:

[0099] The formed green body was heated to 1000°C at 20°C / h for a carbonization, and kept for 3h; and a nitrogen atmosphere was introduced throughout the whole process, and the nitrogen flow rate was 100ml / min. After the heat preservation is completed, the heating is stopped, and the carbonization process is completed after the carbonization furnace is naturally cooled to room temperature and the products are taken out.

[0100] One dip:

[0101] The green body after the primary carbonization was placed in an impregnation tank equipped with impregnated coal tar pitch, and the temperature of the impregnation tank was raised to 200° C. while the impregnation tank was evacuated, and the pressure was maintained under the condition of 0.2 atmospheres for 20 mi...

Embodiment 3

[0108] It is the same as Example 2 except that the mass ratio of pitch coke to chopped carbon fiber is 85:15.

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Abstract

The invention provides high-strength and high-toughness graphite and a preparation method thereof. The preparation method comprises the following steps: step 1, heating, mixing and kneading coke aggregate, short carbon fibers and a binder to obtain a paste material; 2, cooling the paste material, crushing, and carrying out isostatic compaction to obtain a green body; step 3, carbonizing the green body to obtain a carbonized product; and step 4, carrying out graphitization treatment on the carbonized product to obtain the high-strength and high-toughness graphite. According to the preparation method of the high-strength and high-toughness graphite disclosed by the embodiment of the invention, the short carbon fibers are added into the fine-particle coke aggregate, and the high-strength and high-toughness graphite is obtained after isostatic compaction, carbonization and graphitization treatment.

Description

technical field [0001] The invention relates to the technical field of chemical material preparation, in particular to a high-strength and high-toughness graphite and a preparation method thereof. Background technique [0002] 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) thermal High conductivity and good radiation resistance; (4) The raw materials of artificial graphite, such as coke, natural graphite, etc., are rich in sources and cheap in price, and can be easily made into various nuclear grade graphites with high purity, high strength and different particle size requirements. Therefore, it is widely used in nuclear reactors. Especially in high temperature gas-cooled reactors and molten salt reactors belonging to the fourth generation of nuclear power technology, graphite is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/83C04B35/532C04B35/645
CPCC04B35/83C04B35/532C04B35/6455C04B2235/96C04B2235/5264Y02E60/10
Inventor 申克曹欣磊徐昆
Owner HUNAN UNIV
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