Preparation method of zirconium cladding protective coating
A technology of protective coating and zirconium cladding, which is applied in the field of preparation of zirconium cladding protective coating, can solve the problems of non-wear-resistant Cr coating, weak combination of Cr coating and zirconium alloy substrate surface, etc., and achieve comprehensive performance improvement , Excellent resistance to high temperature water vapor oxidation, and the effect of reducing the oxidation rate
Pending Publication Date: 2021-06-04
HARBIN INST OF TECH
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Problems solved by technology
[0005] In order to solve the problems in the prior art that the Cr coating is not firmly bonded to the surface of the zirconium alloy substrate, and the Cr coating is not wear-resistant, a method for preparing a zirconium cladding protective coating is provided.
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specific Embodiment approach 1
[0024] (1) Preparation of functional metal layer Cr coating
[0025] Using magnetron sputtering technology, using chromium target as the target material, the vacuum degree of the background is 5×10 -4 Pa, Ar gas is the working gas, the sputtering power is 150W, the sputtering time is 45min, and the sputtering pressure is 0.5Pa, the functional metal layer Cr coating is plated on the zirconium alloy shell, and the diameter of the chromium target The size is 50 mm, the target distance is 150 mm, and the gas flow rate of argon is 20 sccm.
[0026] (2) Preparation of protective layer
[0027] Place the zirconium alloy tube shell coated with Cr coating in the deposition chamber of the atomic layer deposition instrument, and pump the deposition chamber to 5×10 -3 Torr, then inject nitrogen with a purity of 99.99% to the chamber pressure of 0.15Torr, the temperature in the deposition chamber is 150°C, and repeat 230 atomic layer deposition growth cycles to obtain ZrO 2 film layer, ...
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Abstract
The invention discloses a preparation method of a zirconium cladding protective coating, belongs to the technical field of zirconium cladding protective coatings, and solves the problems that an existing Cr coating and the surface of a zirconium alloy substrate are not firmly combined, the Cr coating is not resistant to abrasion and the like. The Cr layer is plated on the zirconium alloy substrate through the magnetron sputtering technology, a compact protective film is formed by means of an oxidation product Cr2O3, oxygen is greatly prevented from diffusing to the substrate, the oxidation rate of the cladding tube is reduced, the ZrO2 film layer is deposited on the surface of the Cr layer through the atomic layer deposition technology, the micro-nano structure and phase structure arrangement on the surface of the ZrO2 film layer are regulated and controlled through technological parameters, and the binding force between the ZrO2 film layer and the Cr coating is effectively improved; on the basis that ZrO2 has the high density and hardness, the ZrO2 film layer has the effects of fretting wear resistance and corrosion resistance under the conventional working condition, so that the Cr coating is subjected to hole sealing, the Cr coating and the zirconium alloy substrate are prevented from being corroded and worn, and the overall comprehensive performance of the composite coating is improved.
Description
technical field [0001] The invention relates to a preparation method of a zirconium cladding protective coating, belonging to the technical field of zirconium cladding protective coatings. Background technique [0002] After the Fukushima nuclear leak, accident-resistant fuels have been highly valued by researchers. Zirconium alloy cladding is a key material used in nuclear power reactor cores. It is called the "first safety barrier" of nuclear reactors. Its stable performance and improved life are the key to ensuring the safety and reliability of nuclear reactor cores. [0003] At present, the preparation of anti-oxidation coatings with high bonding strength on the surface of zirconium alloys is one of the important research directions. However, the technical challenge faced by the zirconium cladding coating is mainly that the coating does not change the size of the fuel cladding, and at the same time meets various performance requirements of the fuel cladding and componen...
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IPC IPC(8): C23C28/00C23C14/16C23C14/35C23C16/40C23C16/455G21C3/07
CPCC23C28/322C23C28/3455C23C14/165C23C14/35C23C16/405C23C16/45555G21C3/07Y02E30/30
Inventor 卢松涛郭宝洪杨吴晓宏李杨
Owner HARBIN INST OF TECH
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