Multilayer protective coating with high-temperature steam oxidation resistance and hot water corrosion resistance and preparation method and application

A protective coating and water vapor technology, applied in the coating, metal material coating process, vacuum evaporation plating, etc., can solve the problems of poor hot water corrosion resistance, loss of accident tolerance, coating corrosion, etc. To prevent diffusion, overcome the inability to resist hot water corrosion, and improve the toughness of the coating

Active Publication Date: 2019-11-22
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
View PDF7 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the typical Cr-Al-Si-N protective coating has a good protective effect in the water vapor environment of 1000 °C under the fault-tolerant working condition, the Al in the coating is easily mixed with water in the hot water environment under the normal working condition. It reacts to form a loose and easily soluble AlO(OH) compound, which makes its hot water corrosion resistance worse, and eventually causes the coating to be corroded and invalid, and loses its accident tolerance

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Multilayer protective coating with high-temperature steam oxidation resistance and hot water corrosion resistance and preparation method and application
  • Multilayer protective coating with high-temperature steam oxidation resistance and hot water corrosion resistance and preparation method and application
  • Multilayer protective coating with high-temperature steam oxidation resistance and hot water corrosion resistance and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0044] All examples were prepared as figure 2 As shown, when the background vacuum is ≤8×10 -5 Pa, start to heat sample 7 to 600°C and keep it warm for 2 hours, apply a bias voltage of -15V ~ -10V to the substrate, and enter Ar and N respectively through the gas inlet 6 in the chamber 1 2 As a sputtering and reaction gas source, the air pressure of the chamber 1 is adjusted by controlling the opening and closing of the gas outlet 5. In this gas source, 3A targets (Cr a Al b Si 1-a-b target, wherein, 0.5≤a≤0.6, 0.25≤b≤0.3) and 3B target (Cr target) get multi-layer protective coating, 3A target and 3B target are separated by separator 4 (the purpose of isolation is 3A target and 3 B target work independently without interfering with each other, so that the Cr layer and the CrAlSiN layer do not interfere with each other when depositing the Cr layer and the CrAlSiN layer). In the process of sputtering the 3A target and the 3B target, the RF-assisted DC power supply method is u...

Embodiment 1

[0064] This embodiment is prepared by magnetron sputtering method, and the parameters are set as: background vacuum 8×10 -5 Pa; chamber air pressure: 0.5Pa; 3A target components use Cr 0.6 Al 0.3 Si 0.1 target, 3A target power density is 6.2 W / cm 2 ; 3B target power density is 5.2W / cm 2 ; Sputter the 3A target first (the 3B target is closed at this time), and pass in N 2 The flow ratio of Ar gas and Ar gas is 0.13, and the control sample 7 is facing the 3A target, and a 6 μm thick CrAlSiN layer is obtained by sputtering; after that, the 3A target and the N 2 Gas source, start 3B target, start sputtering 3B target and control sample 7 to face 3B target, sputter to get a 4μm thick Cr layer, and do this alternately once to get a Cr / CrAlSiN multilayer protective coating with a periodic layer λ of 1 , one of the periodic layers has a CrAlSiN layer thickness of 6 μm and a Cr layer thickness of 4 μm.

[0065] Structural characterization of the Cr / CrAlSiN (λ=1) multilayer protec...

Embodiment 2

[0071] This embodiment is prepared by magnetron sputtering method, and the parameters are set as: background vacuum 6×10 -5 Pa; chamber air pressure: 0.5Pa; 3A target components use Cr 0.5 Al 0.25 Si 0.25 ; 3A target power density is 6.7 W / cm 2 , 3B target power density is 4.8W / cm 2 ; Sputter the 3A target first (the 3B target is closed at this time), and pass in N 2 The flow ratio of Ar gas and Ar gas is 0.15, and the control sample 7 is facing the 3A target, and a 2.5 μm thick CrAlSiN layer is obtained by sputtering; after that, the 3A target and the N 2 Gas source, start 3B target, start sputtering 3B target and control sample 7 to face 3B target, sputter to get a 2.5μm thick Cr layer, do this twice alternately, get a Cr / CrAlSiN multilayer protective coating with a periodic layer λ of 2 Layers, one of the periodic layers has a CrAlSiN layer thickness of 2.5 μm and a Cr layer thickness of 2.5 μm.

[0072] Structural characterization of the Cr / CrAlSiN (λ=2) multilayer p...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
densityaaaaaaaaaa
grain sizeaaaaaaaaaa
densityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a multilayer protective coating with high-temperature steam oxidation resistance and hot water corrosion resistance. The multilayer protective coating comprises the following components: a Cr layer and a CrAlSiN layer which are periodically and alternately deposited, wherein the most surface layer of the coating is the Cr layer; the cycle number of the alternate depositionis 1-20; the thickness of the Cr layer and the CrAlSiN layer in the unit period is 0.5-10 microns, and the thickness ratio is 2: 3-3: 2. The multilayer protective coating is formed by alternately depositing theCr layer and the CrAlSiN layer on the surface of a zirconium alloy substrate by adopting a magnetron sputtering method. The invention also provides a zirconium alloy covering housing manufactured by the abovementioned method. The multilayer protective coating has the advantages of hot water corrosion resistance under the normal working condition (600-650 DEG C) and high-temperature steamoxidation resistance under the accident fault-tolerant working condition (1000-1200 DEG C), and effectively meets the protection requirements under two working conditions of a light water reactor.

Description

technical field [0001] The invention belongs to the field of ceramic coatings, in particular to a multi-layer protective coating with high temperature water vapor oxidation resistance and hot water corrosion resistance, a preparation method and an application. Background technique [0002] Zirconium alloy has the advantages of radiation resistance and low thermal neutron absorption cross section. It is the cladding material of the mainstream light water reactor fuel at present. Its stable performance and improved life are the keys to ensure the safety and reliability of the nuclear reactor core. However, in the case of coolant failure (LOCA), zirconium alloys are prone to react with high-temperature water vapor to generate a large amount of hydrogen, which can cause an explosion, which is also the main reason for the explosion of the Fukushima nuclear power plant in Japan and the nuclear leak. Therefore, preventing or mitigating the reaction of zirconium alloys with high-tem...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/14C23C14/06C23C14/54
CPCC23C14/0036C23C14/0641C23C14/14C23C14/352C23C14/548
Inventor 黄峰刘海勇李朋葛芳芳祝涵
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap