Preparation method of CrN-Cr-CrN composite protective coating on surface of Zr-4 cladding

A protective coating, zr-4 technology, applied in the coating, metal material coating process, ion implantation plating and other directions, can solve the problems of cladding failure, cracks, poor bonding force of zirconium alloy substrate, etc., to achieve enhanced bonding strength, simple preparation method, and the effect of improving bonding strength

Pending Publication Date: 2021-11-16
HARBIN INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing CrN ceramic coating has poor bonding force with the zirconium alloy substrate, and it is relatively brittle, and cracks will be generated when a small deformation occurs, leading to the failure of the cladding.

Method used

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  • Preparation method of CrN-Cr-CrN composite protective coating on surface of Zr-4 cladding
  • Preparation method of CrN-Cr-CrN composite protective coating on surface of Zr-4 cladding

Examples

Experimental program
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Effect test

Embodiment 1

[0038] 1. Substrate pretreatment

[0039] (1) The sheet-shaped Zr-4 alloy is processed by wire cutting into a sheet-shaped substrate sample with a size of 20×20×2 mm, which is polished with 100 mesh, 400 mesh, 1200 mesh and 2000 mesh sandpaper in sequence, and the edges and corners are ground into rounded corners. Then use acetone, absolute ethanol and deionized water to repeatedly ultrasonically clean 3 times. Finally, the cleaned samples were dried for 1 h in a blast drying oven at a temperature of 70 °C.

[0040] (2) Put the sample after ultrasonic cleaning into the plasma machine, evacuate it through a mechanical pump for 15 minutes, pass in argon gas and maintain the pressure to 1.0pa, turn on the power, and use the plasma generated by passing in argon gas as the sample Etch and clean one piece, turn over after cleaning, and use the same process to etch and clean the other side. The etching and cleaning conditions are bias voltage -200V, the atmosphere is argon, the pr...

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Abstract

The invention discloses a preparation method of a CrN-Cr-CrN composite protective coating on the surface of a Zr-4 cladding, and belongs to the technical field of functional material preparation. The technical problem that the binding force between an existing Zr-4 cladding coating and a substrate and the high-temperature oxidation resistance cannot reach an ideal state is solved. According to the invention, the CrN-Cr-CrN composite protective coating is sequentially prepared on the Zr-4 substrate by utilizing a gradient reaction magnetron sputtering technology, so that higher binding force between the coating and the substrate is achieved, and meanwhile, better high-temperature oxidation resistance is ensured, and the application requirement of the coating cladding is met.

Description

technical field [0001] The invention relates to a method for preparing a CrN-Cr-CrN composite protective coating on the surface of a Zr-4 cladding, belonging to the technical field of functional material preparation. Background technique [0002] Nuclear energy is an efficient, clean and sustainable energy that occupies an important position in the world's energy structure. Nuclear power generation has been studied as an efficient and clean energy generation method. Zirconium alloys are used as cladding materials for nuclear reactors due to their low neutron absorption cross section, good corrosion resistance, good comprehensive mechanical properties, easy processing, good thermal conductivity and excellent linear expansion coefficient. However, under accident conditions, the zirconium alloy will react with high-temperature water vapor to generate hydrogen and explode (Zr+2H 2 O=ZrO 2 +2H 2 ↑). In order to improve the safety of nuclear reactors, a new cladding material ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/06C23C14/02C23C14/16C23C14/35
CPCC23C14/35C23C14/165C23C14/0641C23C14/0073C23C14/0094C23C14/025
Inventor 卢松涛李召峰李杨洪杨吴晓宏
Owner HARBIN INST OF TECH
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