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Plasma spraying remelting Cr/FeCrAl coating on zirconium alloy surface and preparation method of plasma spraying remelting Cr/FeCrAl coating

A surface plasma, zirconium alloy technology, applied in metal material coating process, coating, melt spraying and other directions, can solve the problem of exposed core, achieve dense coating, superior corrosion resistance, and improve high temperature oxidation resistance Effect

Pending Publication Date: 2022-05-27
江苏通和生物医药科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In 2011, a magnitude 9.0 earthquake occurred in Fukushima, Japan, causing the rapid cooling system failure of two nuclear power reactors in Fukushima Prefecture.
Regrettably, no coating has been found so far that can be well adapted to both normal and LOCA accident conditions

Method used

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  • Plasma spraying remelting Cr/FeCrAl coating on zirconium alloy surface and preparation method of plasma spraying remelting Cr/FeCrAl coating
  • Plasma spraying remelting Cr/FeCrAl coating on zirconium alloy surface and preparation method of plasma spraying remelting Cr/FeCrAl coating
  • Plasma spraying remelting Cr/FeCrAl coating on zirconium alloy surface and preparation method of plasma spraying remelting Cr/FeCrAl coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A preparation method for plasma spraying Cr / FeCrAl coating on the surface of zirconium alloy, comprising the following steps:

[0044] (1) Pretreatment method of zirconium alloy substrate:

[0045] After the zirconium alloy substrate is polished with 200 mesh, 400 mesh, 600 mesh, 800 mesh, and 1200 mesh sandpaper in sequence, the zirconium alloy substrate is cleaned and sandblasted;

[0046] After putting it into the spraying device and fixing it, before spraying, without powder feeding gas or powder feeding, the surface of the substrate is heated by plasma flame;

[0047] (2) Plasma spraying process:

[0048] Dry the FeCrAl powder with a size between 15-5 microns in an oven at 150°C for two hours and then pour it into the powder feeding device, place the pretreated zirconium alloy on the spraying equipment, and spray it, the specific parameters for:

[0049] Main gas: argon, gas flow 40L min -1 , Auxiliary gas: hydrogen, gas flow 8L min -1 , powder feeding gas flo...

Embodiment 2

[0060] The difference between this embodiment and embodiment 1 is that the spraying distance in step 1 is 180 mm, and the moving speed of the spray gun is 200 mm / s. Other parameters are the same as in Example 1.

Embodiment 3

[0062] The difference between this embodiment and embodiment 1 is that the remelting distance in step 2 is 70 mm, and the number of passes is 2. Other parameters are the same as in Example 1.

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Abstract

The invention discloses a preparation method of a plasma spraying remelting Cr / FeCrAl LOCA accident resistant coating on the surface of a nuclear zirconium alloy. The method comprises the following steps: firstly, placing a pretreated zirconium alloy matrix on spraying equipment, and spraying the zirconium alloy matrix with preheated FeCrAl powder; after spraying of the FeCrAl layer is finished, a powder feeder of the spraying device is closed, the spraying process is changed, and under the condition that spraying equipment does not feed powder, plasma gas serves as a heat source, the original spraying surface is heated, so that the FeCrAl layer is remelted, and metallurgical bonding is formed between the FeCrAl layer and a zirconium alloy matrix with the surface layer melted under the action of the heat source; and after the remelting of the FeCrAl layer is finished, the FeCrAl layer is not subjected to any treatment, the preheated pure Cr powder is immediately sprayed on the FeCrAl layer, and finally, the remelted Cr / FeCrAl coating is formed. The preparation method which is high in plasma spraying reliability, high in repeatability, efficient and economical is adopted, the remelting technology in the coating preparation process does not need additional equipment or a post-treatment method, the preparation process is simple, and the industrial popularization prospect is achieved.

Description

technical field [0001] The invention relates to the technical field of preparing a high-temperature corrosion-resistant coating on the surface of a zirconium alloy, in particular to a plasma-sprayed remelted Cr / FeCrAl coating on the surface of a zirconium alloy and a preparation method thereof. Background technique [0002] In 2011, a magnitude 9.0 earthquake occurred in Fukushima, Japan, which caused the rapid cooling system failure of two nuclear power reactors in Fukushima Prefecture. The core fuel rod cladding material is zirconium alloy for nuclear use. Insufficient cooling causes the temperature of the fuel rod to rise rapidly. Under high temperature, the zirconium alloy fuel cladding tube reacts with water to generate a large amount of hydrogen gas, which triggers an explosion and eventually leads to the leakage of radioactive substances, causing serious damage to the whole world. The world has had catastrophic effects. Such accidents are commonly referred to as loss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/073C23C4/08C23C4/18C23C4/02
CPCC23C4/134C23C4/073C23C4/08C23C4/18C23C4/02Y02E30/30
Inventor 陈靓瑜徐程王立强刘金晶
Owner 江苏通和生物医药科技有限公司
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