Method for preparing zirconium dioxide permeation layer by zirconium or zirconium alloy surface ion oxygen permeation

Abstract

The invention discloses a method for preparing a zirconium dioxide permeation layer by zirconium or zirconium alloy surface ion oxygen permeation, which comprises the following steps: 1. sanding a zirconium or zirconium alloy surface, carrying out ultrasonic cleaning and water washing, and baking; 2. putting the zirconium or zirconium alloy into an ion nitriding furnace, vacuumizing until the gas pressure in the furnace is not greater than 10Pa, introducing argon into the ion nitriding furnace, carrying out ion bombardment cleaning on the zirconium or zirconium alloy surface when the gas pressure in the furnace is not lower than 20Pa, introducing air or oxygen into the ion nitriding furnace, and carrying out ion oxygen permeation on the zirconium or zirconium alloy surface subjected to ion bombardment cleaning, thereby obtaining the zirconium dioxide permeation layer on the zirconium or zirconium alloy surface. The zirconium or zirconium alloy surface subjected to ion bombardment cleaning is subjected to oxygen permeation to obtain the zirconium dioxide permeation layer with uniform and compact structure on the zirconium or zirconium alloy surface; and the zirconium dioxide permeation layer has high growth speed, and can obviously enhance the surface hardness and corrosion resistance of the zirconium or zirconium alloy.

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...

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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

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