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Technology for preparing nuclear fission reactor fuel clad surface CrAlSiN gradient coating

A gradient coating and fuel cladding technology, applied in metal material coating process, coating, fuel elements, etc., can solve the problems of poor high temperature corrosion resistance and achieve good toughness, thermal shock resistance, and excellent mechanical properties , the effect of excellent wear resistance

Inactive Publication Date: 2012-04-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention aims at the technical shortcomings of poor high-temperature corrosion resistance of low-expansion austenitic stainless steel used in supercritical water-cooled reactor fuel cladding in current nuclear fission reactors, and combines high-temperature oxidation-resistant coating technology to provide an excellent resistance to high-temperature corrosion and oxidation. A new process of chromium-aluminum-silicon-nitride (CrAlSiN) gradient coating for nuclear fission reactor fuel cladding surface coating with good performance and mechanical properties and low swelling austenitic stainless steel substrate

Method used

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  • Technology for preparing nuclear fission reactor fuel clad surface CrAlSiN gradient coating

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Embodiment 1

[0036] The preparation process of the CrAlSiN gradient coating of the present invention is carried out sequentially according to the aforementioned process steps and process conditions.

[0037] Depositing a CrAlSiN gradient coating on the surface of the 316Ti stainless steel substrate used for supercritical water-cooled reactor fuel cladding includes the following process steps:

[0038] (1) Surface polishing and cleaning of substrate samples

[0039] First, the surface of the substrate sample is ground and polished with 300-1200 mesh water sandpaper in sequence; then, the degreasing agent is cleaned in an ultrasonic vessel, and the degreasing agent is composed of sodium carbonate 160g / L, sodium citrate 45g / L, active agent 5g / L, sodium phosphate 50g / L; then carry out pickling and deionized water rinsing, after pickling and rinsing, use N 2 air to dry the substrate sample; finally, place the substrate sample in a vacuum chamber for plasma bias backsplash cleaning, and the pr...

Embodiment 2

[0057] The CrAlSiN gradient coating was prepared using the same process steps, process conditions and process parameters as in Example 1; because the coating performance is affected by the properties of the substrate, sublayer thickness, composition gradient, etc., the difference from Example 1 is Example 2 The substrate used is a 1.4970 austenitic stainless steel substrate. In this embodiment, a CrAlSiN gradient coating is deposited on the surface of the 1.4970 steel substrate.

[0058] The experimental results of Example 2 are: the thicknesses of the Cr, CrAl and CrAlN sub-layer coatings are 120 nm, 220 nm and 300 nm respectively; the thickness of the CrAlSiN gradient coating is 3.0 μm.

[0059] Except above-mentioned, other processing parameters are all identical with embodiment 1. Adopt the same coating performance testing method as in Example 1. The results show that the CrAlSiN gradient coating has a hardness of 39GPa, an interface adhesion with the substrate of 36N, an...

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Abstract

The invention relates to a new technology for depositing a CrAlSiN gradient coating with high-temperature oxidation corrosion resistance and excellent mechanical properties on a supercritical water-cooled reactor fuel clad surface in a nuclear fission reactor. The CrAlSiN gradient coating is deposited on the surface of a base material by adopting a multi-target reaction magnetron sputtering method, and the technology comprises the following four continuous stages of: 1, preparing a Cr gradient coating; 2, preparing a CrAl gradient coating; 3, preparing a CrAlN gradient coating; and preparing the CrAlSiN gradient coating, and annealing. By reasonably designing the gradient variable microstructure of each element, the anti-oxidation temperature of the coating reaches 950 DEG C, the hardnessof the coating reaches over 37GPa, and the adhesive force of the coating adhered to the base material reaches 34N; the coating also has excellent thermal shock resistance, abrasion resistance and thelike; and the service property of the supercritical water-cooled reactor fuel clad part can be greatly improved, and the service life of the clad part can be greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of surface modification of nuclear fission reactor components, and in particular relates to a chromium-aluminum-silicon-nitrogen (CrAlSiN) gradient deposited on the surface of a supercritical water-cooled reactor fuel cladding in a nuclear fission reactor with excellent high-temperature oxidation corrosion resistance and mechanical properties A new process for the preparation of coatings. Background technique [0002] As an efficient, economical and durable energy source, nuclear energy has significant comprehensive advantages in solving the energy crisis facing the world and protecting environmental quality. In 2002, the International Forum on Generation IV Reactors selected six types of reactors, and the supercritical water-cooled reactor (SCWR) was one of them. SCWR is a high-temperature and high-pressure water-cooled reactor that operates above the thermodynamic critical point of water, and is the most ...

Claims

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Application Information

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IPC IPC(8): C23C14/06C23C14/35C23C14/02G21C3/20
CPCY02E30/40Y02E30/30
Inventor 杨吉军唐军刘宁杨远友廖家莉
Owner SICHUAN UNIV
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