Method for preparing zirconium-based amorphous/nanocrystalline composite coating on surface of zirconium alloy

A nanocrystalline composite and zirconium-based amorphous technology, which is applied in the coating process of metal materials, coatings, etc.

Inactive Publication Date: 2021-05-11
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention utilizes laser cladding + laser remelting to increase the amorphous content of the zircon

Method used

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  • Method for preparing zirconium-based amorphous/nanocrystalline composite coating on surface of zirconium alloy
  • Method for preparing zirconium-based amorphous/nanocrystalline composite coating on surface of zirconium alloy
  • Method for preparing zirconium-based amorphous/nanocrystalline composite coating on surface of zirconium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030]First dry the zirconium powder with a particle size of 200 mesh in a vacuum environment at 50°C for 12 hours, then weigh 75.87g of Zr powder, 11.37g of Ni powder, 3.79g of Al powder, and 8.94g of Cu powder with a particle size of 200 mesh, and put various powder materials in a QM-3SP4 planetary ball mill Mix well, ball milling speed is 500r / min, ball milling time is 2h, vacuum drying is 2h, temperature is 50°C, and natural cooling is performed to obtain mixed powder for laser cladding. In the cladding powder, the particle size of the Zr powder, Al powder, Ni powder and Cu powder is 100-200 mesh, and the purity is 99.5%.

[0031] Take a 702 zirconium block sample with a size of 20×20×10mm, rough-grind the surface with 180-mesh metallographic sandpaper, wash it with acetone to remove oil, wipe it clean, wipe it with alcohol, and blow it dry to obtain pretreatment zirconium alloy matrix material.

[0032] The surface-treated zirconium alloy samples were placed on the laser...

Embodiment 2

[0041] Taking the matrix and powder in Example 1, adjust the laser cladding process parameters as follows: laser power 1600W, spot diameter 4mm, scanning speed 5mm / s. Under laser energy irradiation, a coating that is metallurgically bonded to the substrate is formed on the surface of the zirconium alloy.

[0042] Laser remelting treatment is performed on the coating after cladding, and the laser remelting process parameters are the same as those in Example 1.

[0043] According to the test method of Example 1, the hardness and wear resistance of the cladding layer were detected. Hardness curve such as figure 1 As shown, the wear rate results are as figure 2 shown.

experiment example 3

[0049] Take the matrix and powder in Example 1, and use the laser cladding process parameters in Example 1 to carry out cladding. Under laser energy irradiation, a coating that is metallurgically bonded to the substrate is formed on the surface of the zirconium alloy.

[0050] Perform laser remelting treatment on the coating after cladding: laser power 1500W, spot diameter 4mm, scanning speed 12mm / s.

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Abstract

The invention discloses a method for preparing a zirconium-based amorphous/nanocrystalline composite coating on the surface of a zirconium alloy. The method comprises the following steps that (1) firstly, a substrate is pretreated, wherein the surface is ground so as to remove an oxide layer and impurities on the surface, and the surface is cleaned and dried by using alcohol or acetone; (2) a preset powder method is adopted for carrying out cladding, the laser power ranges from 1200 W to 2000 W, the spot diameter is 4 mm, the scanning speed ranges from 4 mm/s to 6 mm/s, and the cladding time ranges from 3 s to 5 s; and (3) the coating obtained after cladding is subjected to laser remelting treatment, wherein the laser power ranges from 800 W to 1500 W, the spot diameter is 4 mm, the scanning speed ranges from 8 mm/s to 12 mm/s, and the cladding time ranges from 1 s to 2 s. The preparation method is advanced in process and accurate in technical parameters, and is an advanced preparation method of the zirconium-based amorphous coating.

Description

technical field [0001] The invention relates to an amorphous / nanocrystalline coating material, in particular to an amorphous / nanocrystalline composite coating material which uses laser cladding to strengthen the wear resistance of the zirconium alloy surface, and belongs to the technical field of composite coating materials. Background technique [0002] Zirconium alloys are solid solutions of zirconium or other metals. Zirconium has a very low thermal neutron absorption cross-section, high hardness, ductility and corrosion resistance. It is mainly used in the field of nuclear technology, such as fuel rods in nuclear reactors. Pure zirconium cannot meet the requirements of nuclear fuel cladding and pressure tubes in terms of its strength, wear resistance and corrosion resistance. [0003] In recent years, researchers at home and abroad have made some achievements and progress in the preparation of amorphous coatings with excellent properties on the surface of metal material...

Claims

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Application Information

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IPC IPC(8): C23C24/10C22C16/00
CPCC23C24/106C22C16/00
Inventor 李玉新刘思远陈博文白培康梁志国赵占勇关庆丰
Owner ZHONGBEI UNIV
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