Surface treatment method for nuclear reactor waste container

A nuclear reactor and surface treatment technology, applied in portable protective containers, nuclear engineering, metal material coating technology, etc., to achieve excellent resistance to microporous corrosion and crevice corrosion, reduce production costs, and ensure the effect of density and bonding strength

Active Publication Date: 2020-01-03
上海离原环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Spray dense B on steel substrate by HVOF process 4 The method of C / Al composite coating has not been reported at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The method of surface treatment for nuclear reactor waste containers is carried out as follows:

[0023] S1: The mass percentage ratio is 60%: 40% Al alloy and B 4 C powder is mixed with a high-speed mixer, the mixing time is 150min, the mixing power is 15-30kW, and the rotation speed is 4000-5000 rpm to obtain the mixed powder;

[0024] S2: Use ultrasonic waves to sieve the surface of the mixed powder obtained in S1 to obtain B 4 C / Al composite particles, the time is 15-30min, to achieve the effect of destroying agglomeration and uniform dispersion; and

[0025] S3: Using the supersonic flame spraying method, the B in S2 is sprayed through the spray gun 4 The C / Al composite powder is directly sprayed onto the surface of the nuclear reactor waste container to obtain a layer of B 4 C / Al composite coating, followed by repeated spraying of the spray gun back and forth over the surface of the nuclear reactor waste container, so that the B 4 C / Al composite coating layer ...

Embodiment 2

[0032] The method of surface treatment for nuclear reactor waste containers is carried out as follows:

[0033] S1: The mass percentage ratio is 50%: 50% Al alloy and B 4 C powder is mixed with a high-speed mixer, the mixing time is 120min, the mixing power is 15-30kW, and the rotation speed is 4000-5000 rpm to obtain the mixed powder;

[0034] S2: Use ultrasonic waves to sieve the surface of the mixed powder obtained in S1 to obtain B 4 C / Al composite particles, the time is 15-30min, to achieve the effect of destroying agglomeration and uniform dispersion; and

[0035] S3: Using the supersonic flame spraying method, the B in S2 is sprayed through the spray gun 4 The C / Al composite powder is directly sprayed onto the surface of the nuclear reactor waste container to obtain a layer of B 4 C / Al composite coating, followed by repeated spraying of the spray gun back and forth over the surface of the nuclear reactor waste container, so that the B 4 C / Al composite coating layer ...

Embodiment 3

[0042] The method of surface treatment for nuclear reactor waste containers is carried out as follows:

[0043] S1: The mass percentage ratio is 40%: 60% Al alloy and B 4 C powder is mixed with a high-speed mixer, the mixing time is 100min, the mixing power is 15-30kW, and the speed is 4000-5000 rpm to obtain the mixed powder;

[0044] S2: Use ultrasonic waves to sieve the surface of the mixed powder obtained in S1 to obtain B 4 C / Al composite particles, the time is 15-30min, to achieve the effect of destroying agglomeration and uniform dispersion; and

[0045] S3: Using the supersonic flame spraying method, the B in S2 is sprayed through the spray gun 4 The C / Al composite powder is directly sprayed onto the surface of the nuclear reactor waste container to obtain a layer of B 4 C / Al composite coating, followed by repeated spraying of the spray gun back and forth over the surface of the nuclear reactor waste container, so that the B 4 C / Al composite coating layer by layer,...

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Abstract

The invention discloses a surface treatment method for a nuclear reactor waste container. The method includes the following steps of S1, mixing Al alloy and B<4>C powder in the mass ratio of 5-7% to 30-95% for 60-240 min by using a high-speed mixer to obtain mixed powder; S2, carrying out ultrasonic screening on the surface of the mixed powder obtained in the S1 by using ultrasonic waves to obtainB<4>C/Al composite particles; S3, directly spraying the B<4>C/Al composite powder in the S2 onto the surface of the nuclear reactor waste container through a spray gun by adopting a hypersonic flamespraying method to obtain a layer of B<4>C/Al composite coating, and then repeatedly spraying the B<4>C/Al composite powder back and forth on the surface of the nuclear reactor waste container throughthe spray gun to stack the B<4>C/Al composite coatings layer by layer, wherein the thickness of each layer of the B<4>C/Al composite coating is 10-20 micrometers. The structural strength requirementof the container is met, the aim of radioactive shielding is achieved, the bonding force of the B<4>C/Al composite coatings to the nuclear reactor waste container and the density of the B<4>C/Al composite coatings are improved, the porosity of the B<4>C/Al composite coatings is reduced, and it is ensured that B<4>C is uniformly dispersed.

Description

technical field [0001] The invention relates to a surface treatment method for nuclear reactor waste containers. Background technique [0002] Generally, each million-kilowatt-class nuclear power unit can unload 25 tons of spent fuel per year. At present, the accumulated spent fuel in my country has reached more than 1,000 tons. At present, most of the spent fuel storage methods at home and abroad adopt "wet" storage (that is, storing spent fuel on the grid of the pool) and "dry" storage. The dry storage container has the functions of storing and transporting spent fuel. The spent fuel unloaded from the nuclear reactor is extremely radioactive, accompanied by a certain neutron emission rate, and needs to be stored in the spent fuel pool for a period of time, so that most of the radionuclides with short half-lives decay away and take away their decay hot. The materials used to process spent fuel not only require high thermal neutron absorption capacity, but also high streng...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/129G21F5/008
CPCC23C4/06C23C4/129G21F5/008
Inventor 潘文高李朝明李运红禹兴利韩辉
Owner 上海离原环境科技有限公司
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