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A method for preparing zirconium dioxide infiltrated layer by ionizing oxygen on the surface of zirconium or zirconium alloy

A technology of ion oxygen penetration and zirconia, which is applied in the direction of metal material coating process, coating, solid-state diffusion coating, etc., can solve the problem that the structure compactness of zirconia infiltration layer needs to be improved, and the speed of zirconia infiltration layer is slow , low hardness of zirconium and zirconium alloys, etc., to achieve the effect of strong substrate shape adaptability, improved surface hardness and corrosion resistance, and simple equipment

Inactive Publication Date: 2017-05-10
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, zirconium and zirconium alloys have low hardness and poor wear resistance, and the zirconia infiltrated layer formed on the surface of zirconium and zirconium alloys can enhance the surface hardness and wear resistance of zirconium and zirconium alloys.
In the prior art, a zirconium dioxide infiltrated layer can be prepared on the zirconium surface by thermal oxidation (patent No. CN101925681A) or anodic oxidation (patent No. CN101994144A), but the speed of preparing the zirconium dioxide infiltrated layer by the above two methods is relatively slow. Moreover, the compactness of the zirconium dioxide infiltrated layer still needs to be improved. Therefore, it is still an important research in the use of zirconium and zirconium alloys to explore the method of preparing a zirconium dioxide infiltrated layer with a fast growth rate and a dense structure on the surface of zirconium and zirconium alloys. content

Method used

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  • A method for preparing zirconium dioxide infiltrated layer by ionizing oxygen on the surface of zirconium or zirconium alloy
  • A method for preparing zirconium dioxide infiltrated layer by ionizing oxygen on the surface of zirconium or zirconium alloy

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Experimental program
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Effect test

Embodiment 1

[0016] This embodiment includes the following steps:

[0017] Step 1: Grinding the surface of the zirconium alloy, then ultrasonically cleaning the polished zirconium alloy, washing with water, and then drying; the zirconium alloy is a Zr-3 alloy, and the ultrasonic cleaning time is 30 minutes;

[0018] Step 2. Place the dried zirconium or zirconium alloy in the step 1 in the ion nitriding furnace, vacuumize until the pressure in the furnace is not greater than 10Pa, then feed argon gas into the vacuumized ion nitriding furnace, Under the condition that the air pressure in the furnace is not lower than 20Pa, carry out ion bombardment cleaning on the surface of zirconium or zirconium alloy. The surface of the zirconium alloy after cleaning is subjected to ion oxygen infiltration treatment, and after being cooled to room temperature with the furnace, a zirconium dioxide infiltration layer is obtained on the surface of the zirconium alloy; the time for the ion bombardment cleanin...

Embodiment 2

[0021] This embodiment includes the following steps:

[0022] Step 1. Polish the zirconium surface, then ultrasonically clean the polished zirconium, wash with water and then dry; the zirconium is pure zirconium with a mass purity of not less than 99%, and the ultrasonic cleaning time is 35 minutes;

[0023] Step 2. Place the dried zirconium or zirconium alloy in the step 1 in the ion nitriding furnace, vacuumize until the pressure in the furnace is not greater than 10Pa, then feed argon gas into the vacuumized ion nitriding furnace, Under the condition that the pressure in the furnace is not lower than 20Pa, carry out ion bombardment cleaning on the surface of zirconium or zirconium alloy. The cleaned zirconium surface is subjected to ion oxygen permeation treatment, and after being cooled to room temperature with the furnace, a zirconium dioxide infiltrated layer is obtained on the zirconium surface; the time for the ion bombardment cleaning is 40 minutes, and the time for t...

Embodiment 3

[0026] This embodiment includes the following steps:

[0027] Step 1: Grinding the surface of the zirconium alloy, then ultrasonically cleaning the polished zirconium alloy, washing with water, and then drying; the zirconium alloy is a Zr-1 alloy, and the ultrasonic cleaning time is 40 minutes;

[0028] Step 2. Place the dried zirconium or zirconium alloy in the step 1 in the ion nitriding furnace, vacuumize until the pressure in the furnace is not greater than 10Pa, then feed argon gas into the vacuumized ion nitriding furnace, Under the condition that the pressure in the furnace is not lower than 20Pa, carry out ion bombardment cleaning on the surface of zirconium or zirconium alloy. The surface of the zirconium alloy after cleaning is subjected to ion oxygen infiltration treatment, and after being cooled to room temperature with the furnace, a zirconium dioxide infiltration layer is obtained on the surface of the zirconium alloy; the time for the ion bombardment cleaning is...

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Abstract

The invention discloses a method for preparing a zirconium dioxide infiltrated layer by ionizing oxygen on the surface of zirconium or zirconium alloy. The method comprises the following steps: 1. grinding the surface of zirconium or zirconium alloy, ultrasonic cleaning and water washing, and then drying; 2. Zirconium or zirconium alloys are placed in the ion nitriding furnace, vacuumed until the pressure in the furnace is not greater than 10Pa, and then argon is introduced into the ion nitriding furnace, and the zirconium or zirconium alloy is treated under the condition that the pressure in the furnace is not lower than 20Pa. The surface is cleaned by ion bombardment, and then air or oxygen is introduced into the ion nitriding furnace, and the surface of zirconium or zirconium alloy after ion bombardment cleaning is subjected to ion oxygen infiltration treatment, and a zirconium dioxide infiltrated layer is obtained on the surface of zirconium or zirconium alloy. In the present invention, a uniform and compact zirconium dioxide infiltrated layer is obtained on the surface of zirconium or zirconium alloy by performing oxygen infiltration on the surface of zirconium or zirconium alloy after ion bombardment cleaning, and the growth rate of the zirconium dioxide infiltrated layer is fast, which can significantly Improve the surface hardness and corrosion resistance of zirconium or zirconium alloys.

Description

technical field [0001] The invention belongs to the technical field of material surface chemical heat treatment, and in particular relates to a method for preparing a zirconium dioxide infiltrated layer by ionizing oxygen on the surface of zirconium or zirconium alloy. Background technique [0002] Zirconium and zirconium alloys have the advantages of small thermal neutron absorption cross-section and good thermal conductivity, so they are widely used in nuclear power reactor fuel element cladding and other reactor internal components in the field of nuclear industry, and are used as heat exchangers in the chemical industry Reactor vessels and corrosive media pipelines, etc. However, zirconium and zirconium alloys have low hardness and poor wear resistance, and the zirconia infiltrated layer formed on the surface of zirconium and zirconium alloys can enhance the surface hardness and wear resistance of zirconium and zirconium alloys. In the prior art, a zirconium dioxide inf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/12C23C8/36
Inventor 田晓东王利捷孙志平
Owner CHANGAN UNIV