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Preparation method for graphite surface SiC coating used for molten salt reactor

A molten salt reactor and graphite technology, applied in nuclear reactors, fast fission reactors, reactor fuel materials, etc., can solve the problems of high cost, long preparation cycle, unfavorable large-scale application, etc., and achieve low porosity, high density, The effect of compact structure

Inactive Publication Date: 2018-03-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have a long preparation cycle and high cost, which is not conducive to large-scale application.

Method used

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  • Preparation method for graphite surface SiC coating used for molten salt reactor
  • Preparation method for graphite surface SiC coating used for molten salt reactor
  • Preparation method for graphite surface SiC coating used for molten salt reactor

Examples

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Effect test

Embodiment 1

[0040] 1. Prepare polycarbosilane impregnation solution: mix polycarbosilane and xylene at a weight ratio of 1:10 at 30°C and stir to disperse to obtain an impregnation solution for later use.

[0041] 2. After drying the nuclear graphite IG-110 component, place it in the impregnation equipment, raise the temperature to 30°C, keep the temperature constant and start vacuuming to reduce the internal pressure of the impregnation chamber to 0.01MPa and continue vacuuming for 1h.

[0042] 3. Add impregnation liquid to the impregnation equipment (it must be ensured that the liquid level of the impregnation liquid is 10mm higher than the top of the nuclear graphite component after the pressurization), and then pass high-pressure nitrogen into the impregnation equipment to pressurize to 0.5MPa, and maintain a constant high pressure for 3 hours. After the pressure is released, take out the nuclear graphite component and place it in a ventilated and dry place for 8 hours to allow the sol...

Embodiment 2

[0049] 1. Prepare polycarbosilane impregnation solution: mix polycarbosilane and xylene at a weight ratio of 1:5 at 40°C and stir to disperse to obtain an impregnation solution for later use.

[0050] 2. After drying the nuclear graphite IG-110 component, place it in the impregnation equipment, raise the temperature to 40°C, keep the temperature constant and start vacuuming to reduce the internal pressure of the impregnation chamber to 0.01MPa and continue vacuuming for 3 hours.

[0051] 3. Add an appropriate amount of impregnation liquid to the impregnation equipment (it must be ensured that the liquid level of the impregnation liquid is 15mm higher than the top of the nuclear graphite component after the pressurization), and then pass high-pressure nitrogen gas into the impregnation equipment to pressurize to 5MPa, and maintain a constant high pressure for 4h. After the pressure is released, take out the nuclear graphite component and place it in a ventilated and dry place to...

Embodiment 3

[0057] 1. Prepare polycarbosilane impregnation solution: mix polycarbosilane and toluene at a weight ratio of 1:2 at 50°C and stir to disperse to obtain an impregnation solution for later use.

[0058] 2. After drying the nuclear graphite IG-110 component, place it in the impregnation equipment, raise the temperature to 50°C, keep the temperature constant and start vacuuming to reduce the internal pressure of the impregnation chamber to 0.01MPa and continue vacuuming for 2 hours.

[0059] 3. Add an appropriate amount of impregnation liquid to the impregnation equipment (it must be ensured that the liquid level of the impregnation liquid is 15mm higher than the top of the nuclear graphite component after the pressurization is completed), and then pass high-pressure nitrogen into the impregnation equipment to pressurize to 5MPa, and maintain a constant high pressure for 5h. After the pressure is released, take out the nuclear graphite component and place it in a ventilated and dr...

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Abstract

The invention discloses a preparation method for a graphite surface SiC coating used for a molten salt reactor. The preparation method comprises the following steps: adding polycarbosilane or modifiedpolycarbosilane into solvent to be dissolved to obtain polycarbosilane or modified polycarbosilane impregnant; vacuumizing a nuclear graphite construction member in impregnation equipment; adding impregnation liquid into the impregnation equipment for impregnation and drying under high-pressure inert atmosphere; carrying out roasting processing on the dried impregnation nuclear graphite construction member in a high-temperature furnace under the inert atmosphere to obtain the nuclear graphite construction member coated with the SiC coating. The preparation method has the advantages of simpletechnology and low cost and can be produced on a large scale.

Description

technical field [0001] The invention belongs to a method for manufacturing a graphite coating, in particular to a method for preparing a SiC coating on a graphite surface for a molten salt reactor. Background technique [0002] With the development of economy and society, the contradiction between the increasing energy demand of human beings, the depletion of conventional fossil energy and the relative scarcity of renewable energy has gradually intensified. Under such circumstances, the liquid molten salt reactor, an important candidate for the fourth-generation nuclear reactor, came into being, and has rapidly become a nuclear reactor due to its inherent safety, effective use of nuclear resources, prevention of nuclear proliferation, fuel cycle, and economy. A major research hotspot. [0003] Nuclear graphite has the advantages of low neutron absorption cross section, high moderator ratio, high thermal conductivity and excellent mechanical properties, and can be used as ne...

Claims

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Application Information

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IPC IPC(8): C04B41/87G21C1/03G21C3/54
CPCC04B41/009C04B41/5059C04B41/87C04B2111/00862G21C1/03G21C3/54C04B35/522C04B41/4558C04B41/4554C04B41/4539C04B41/0072Y02E30/30
Inventor 刘占军何钊连鹏飞宋金亮张俊鹏郭全贵
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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