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Preparation method of protective coating material for zirconium alloy cladding pipe

A protective coating, zirconium alloy technology, applied in metal material coating process, coating, powder coating and other directions, can solve the problems of reducing the mechanical properties of the cladding, thinning the thickness of the cladding, and becoming brittle, and achieves spray coating. The method is simple and feasible, the effect of good resistance to high temperature water vapor, and excellent thermal shock resistance

Active Publication Date: 2017-06-20
陕西华秦科技实业股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the zirconium alloy cladding tube is working in the reactor, it is subjected to strong neutron irradiation, high temperature and high pressure water, and fission product erosion and erosion, the strength increases, the ductility decreases, the corrosion problem is aggravated, distortion occurs, and the surface oxide layer falls off, etc. Phenomenon, eventually failure and cause nuclear leakage accident
The corrosion of the zirconium alloy cladding tube will have an adverse effect on the performance of the fuel rod: the thickness of the cladding will be thinned, the mechanical properties of the cladding will be reduced, and the cladding may be broken; the corrosion layer formed on the outer surface of the cladding will deteriorate the heat transfer of the cladding , leading to an increase in cladding temperature and creep rate; the corrosion reaction of the cladding will generate hydrogen gas, and the cladding will absorb hydrogen to form hydrides, resulting in embrittlement of the cladding, which may cause hydrogen embrittlement; after the peeling of the oxide film, enrichment in In the coolant, and deposited on the primary circuit components, causing corrosion loss of circuit components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] The particle size is 1μm~15μm3Al 2 o 3 2SiO2 2 Powder, respectively weigh 3Al according to mass percentage 2 o 3 2SiO2 2 Powder 35%, water 64%, polyvinyl alcohol 1%, the total content of the above three substances is 100%;

[0056] 3Al to be weighed 2 o 3 2SiO2 2 Mix the powder, water and polyvinyl alcohol to obtain a mixed material; stir the mixed material to make 3Al 2 o 3 2SiO2 2 Mix the powder, water and polyvinyl alcohol evenly; use a spray drying granulator to granulate the stirred mixture; sieve to obtain 3Al with a particle size of 30 μm to 60 μm 2 o 3 2SiO2 2 agglomerated powder;

[0057] Put the zirconium alloy cladding tube in the sand blasting machine, and make the zirconium alloy cladding tube rotate at a speed of 20r / min, and put the spray gun with built-in SiC sand grains in front of the zirconium alloy cladding tube along the zirconium alloy cladding tube at a speed of 20cm / min. The cladding tube moves axially to spray SiC sand particles to...

Embodiment 2

[0061] Use particle size of 1μm ~ 10μm MgAl 2 o 4 Powder, respectively weigh MgAl according to mass percentage 2 o 4 Powder 30%, water 69%, polyvinyl alcohol 1%, the total content of the above three substances is 100%;

[0062] MgAl to be weighed 2 o 4 Mix the powder, water and polyvinyl alcohol to obtain a mixed material; stir the mixed material to make the MgAl 2 o 4 Mix the powder, water and polyvinyl alcohol evenly; use a spray drying granulator to granulate the stirred mixture; sieve to obtain MgAl with a particle size of 30 μm to 60 μm 2 o 4 agglomerated powder;

[0063] Put the zirconium alloy cladding tube in the sandblasting machine, and make the zirconium alloy cladding tube rotate at a speed of 35r / min, and put the spray gun with built-in SiC sand grains in front of the zirconium alloy cladding tube along the zirconium alloy cladding tube at a speed of 35cm / min. The cladding tube moves axially to spray SiC sand particles to the zirconium alloy cladding tube...

Embodiment 3

[0067] The raw material of the protective coating is 2MgO·2Al with a particle size of 0.5 μm to 5 μm 2 o 3 ·5SiO2 2 Powder, weigh 2MgO·2Al according to mass percentage 2 o 3 ·5SiO2 2 Powder 29%, water 70%, polyvinyl alcohol 1%, the total content of the above three substances is 100%;

[0068] 2MgO·2Al to be weighed 2 o 3 ·5SiO2 2 Mix the powder, water and polyvinyl alcohol to obtain a mixed material; stir the mixed material to make 2MgO·2Al 2 o 3 ·5SiO2 2 Mix the powder, water and polyvinyl alcohol evenly; use a spray drying granulator to granulate the stirred mixture; sieve to obtain 2MgO·2Al with a particle size of 40 μm to 70 μm 2 o 3 ·5SiO2 2 agglomerated powder;

[0069] Put the zirconium alloy cladding tube in the sand blasting machine, and make the zirconium alloy cladding tube rotate at a speed of 30r / min, and put the spray gun with built-in SiC sand grains in front of the zirconium alloy cladding tube at a speed of 30cm / min along the zirconium alloy claddin...

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Abstract

The invention discloses a preparation method of a protective coating material for a zirconium alloy cladding pipe. Specifically, the preparation method comprises the following steps: mixing a main material for a protective coating, water and polyvinyl alcohol to obtain a mixed material; carrying out two types of post-treatment on the mixed material to obtain an agglomerated powdery protective coating raw material for the zirconium alloy cladding pipe or a suspension-shaped protective coating raw material for the zirconium alloy cladding pipe; taking the zirconium alloy cladding pipe and carrying out sand spraying treatment on an outer wall of the zirconium alloy cladding pipe; spraying the agglomerated powdery protective coating raw material for the zirconium alloy cladding pipe or the suspension-shaped protective coating raw material for the zirconium alloy cladding pipe on the outer wall of the zirconium alloy cladding pipe subjected to blast sanding treatment by adopting a thermal spraying technology, so as to form the protective coating material for the zirconium alloy cladding pipe on the outer wall of the zirconium alloy cladding pipe. According to the preparation method of the protective coating material for the zirconium alloy cladding pipe, provided by the invention, a very good protective coating is formed on the outer wall of the zirconium alloy cladding pipe, so that the anti-oxidization performance of the zirconium alloy cladding pipe is improved.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of coating materials, and in particular relates to a preparation method of protective coating materials for zirconium alloy cladding pipes. Background technique [0002] Zirconium alloy cladding tube is the sealed shell of nuclear fuel, and its function is to prevent the escape of fission products, prevent fuel from being corroded by coolant, and effectively export heat energy. Zirconium alloy cladding is the first barrier for the fission products of radioactive fuel rods, and its performance will directly affect the safe and reliable operation of fuel rods in the reactor. When the zirconium alloy cladding tube is working in the reactor, it is subjected to intense neutron irradiation, high temperature and high pressure water, and fission product erosion and erosion, the strength increases, the ductility decreases, the corrosion problem is aggravated, distortion occurs, and the surface ...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D7/12C09D5/46C09D5/03C23C4/11C23C4/134C23C4/129C23C4/02
CPCC09D1/00C09D5/033C09D5/18C09D7/65C23C4/02
Inventor 折生阳
Owner 陕西华秦科技实业股份有限公司
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