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A method for improving the resistance to liquid metal corrosion of martensitic heat-resistant steel

A technology of liquid metal and heat-resistant steel, which is applied in the field of heat treatment and coating on the metal surface, can solve the problems of large difference in thermal expansion coefficient, difficulty in coating titanium carbide ceramics, and restrictions on the sustainable development of nuclear power, so as to improve adhesion, Effect of improving liquid metal corrosion resistance and reducing the possibility of spalling

Active Publication Date: 2016-04-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nuclear power is an ideal choice to meet these challenges, but the problem of nuclear waste disposal has always restricted the sustainable development of nuclear power
The research results show that ceramic coatings such as titanium carbide are favored due to their poor wettability with liquid lead and bismuth and their excellent corrosion resistance, but due to the thermal expansion coefficient of 9-12% Cr martensitic heat-resistant steel and There is a huge difference. It is extremely difficult to prepare a continuous and dense titanium carbide ceramic coating on 9-12% Cr martensitic heat-resistant steel, which has become a technical bottleneck restricting the development of this coating.

Method used

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  • A method for improving the resistance to liquid metal corrosion of martensitic heat-resistant steel
  • A method for improving the resistance to liquid metal corrosion of martensitic heat-resistant steel
  • A method for improving the resistance to liquid metal corrosion of martensitic heat-resistant steel

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Effect test

Embodiment 1

[0023] (1) Pretreatment of the metal surface: the metal sample with a size of 15mm×10mm×2mm was polished step by step to No. 800 with metallographic sandpaper, and all the edges and corners were rounded, and the surface was wetted with 200 mesh glass pellets. Sand blasting, cleaning with metal detergent, ultrasonic cleaning in deionized water, and drying.

[0024] (2) Arc ion plating is used to deposit a layer of titanium on the metal surface, and the purity of the titanium target is above 99.9%; the equipment is domestic MIP-8-800 type AIP, and the arc ion plating process conditions: the vacuum degree of the vacuum chamber is 9×10 -3 Pa, the protective gas Ar gas pressure is kept at 0.25Pa, the furnace chamber temperature is 110°C, the bias voltage is -800V, the bias duty cycle is 30%, the target base distance is 240mm, the arc current and voltage are 55A and -20V respectively, pre-sputtering Shot cleaning for 4 minutes, keeping other parameters unchanged, adjusting the bias ...

Embodiment 2

[0029] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.19wt.%, Si: 1.05wt.%, Cr: 10.05wt.%, Mn: 1.06wt.%, W: 1.19wt.%. , Ta: 0.1wt.%, V: 0.2wt.%, Nb: 0.01wt.%, and the balance is iron. Other surface treatment processes of the metal are the same as in Example 1.

Embodiment 3

[0031] The chemical composition of 9-12% Cr martensitic heat-resistant steel is: C: 0.15wt.%, Si: 1.23wt.%, Cr: 10.46wt.%, Mn: 0.41wt.%, W: 1.5wt.%. , Ta: 0.15wt.%, V: 0.19wt.%, Nb: 0.014wt.%, and the balance is iron. The metal surface treatment process is the same as in Example 1.

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Abstract

The invention aims to provide a method for improving the liquid metal corrosion resistance of martensitic heat-resistant steel. The method is characterized by: firstly pre-plating a titanium layer on the surface of martensitic heat-resistant steel, then making the carbon on the surface layer of the martensitic heat-resistant steel react with the pre-plated titanium layer on the surface by means of vacuum heat treatment, thus finally forming a ceramic coating of titanium carbide. By employing the method to treat the surface of martensitic heat-resistant steel, the liquid metal corrosion resistance of metal can be effectively improved, and the service life of metal materials can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and particularly provides a process method for coating and heat treating the metal surface. Background technique [0002] With the intensification of the energy crisis, it is imminent to develop safe, high energy density, and environment-friendly new energy sources. Nuclear power is an ideal choice to meet these challenges, but the problem of nuclear waste disposal has always restricted the sustainable development of nuclear power. ADS transmutation system (Accelerator Driven Transmutation System) is currently the most promising nuclear waste transmutation system because of its efficient use of nuclear waste and high system security. Liquid lead and liquid lead-bismuth eutectic have become the materials of choice for spallation targets and coolants in ADS transmutation systems due to their superior physical and chemical properties. [0003] Martensitic heat-resistant steel is wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/32C23C14/16C23C14/58C22C38/26C22C38/24
Inventor 严伟单以银王威石全强杨振国杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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