| The rise of nuclear power plants has eased today's growing energy demand.However,the major nuclear accident at the Fukushima nuclear power plant in 2011 once again focused attention on the issue of nuclear safety.The accident revealed the safety problem that the fuel particle cladding zirconium alloy is prone to zirconium-water reaction and release hydrogen under high temperature water vapor.Based on this background,a technical concept called Accident-tolerant Fuel(ATF)was proposed.The surface coating technology is favored because of its mature technology and application.Film properties is one of the key factors of the film protection technology.The amorphous/crystalline nano-multilayer film has many excellent properties to meet the service requirements in a complex environment.The main factors affecting the performance of the film are the deposition conditions,the composition of the monolayer material participating in the ratio,and the influence of the amorphous/crystalline interface.In this study,fixed deposition conditions were set up,and a series of ZrC/Ni and ZrC/Zr amorphous/crystals with different thickness ratios were deposited on a silicon substrate using magnetron sputtering technology at room temperature and 0.7 Pa Ar atmosphere process conditions.Helium irradiation and vacuum high-temperature annealing experiments were performed on ZrC/Ni nano-multilayer films,and high-dose high-temperature helium irradiation experiments were performed on ZrC crystal materials.A series of characterization methods such as grazing incidence X-ray diffraction(GIXRD),scanning electron microscope(SEM),transmission electron microscope(TEM),and atomic force microscope(AFM)were used to detect and analyze the nanomultilayer film samples before and after irradiation in detail.The results show:1)The film-forming quality of ZrC/Ni nano multilayer film and ZrC/Zr nano multilayer film is good,there are no obvious bulges and voids on the surface,the interface is clear and smooth,and there is no distortion and segregation between layers;ZrC/Ni nano-multilayer film were composed of crystalline nickel layer and amorphous zirconium carbide layer alternately,and no obvious effect was found between the zirconium carbide layer and the nickel layer.2)The ZrC/Zr nano-multilayer film is actually composed of crystalline zirconium carbide layer and amorphous zirconium carbide layer alternately.During the preparation of the ZrC/Zr nano-multilayer film,when the zirconium carbide target was deposited,the carbon atoms entered the previously deposited zirconium crystal layer and reacted to form zirconium carbide crystal layer;and the deposited zirconium carbide layer shown amorphous structure because it does not have sufficient driving force to recrystallize.A idea for preparation of amorphous/crystalline nano-multilayer film with a predetermined composition—Using the high diffusion properties of the specified atoms to react with certain specific layers,an amorphous/crystalline nano-multilayer film with a desired modulation ratio can be prepared.3)At room temperature,50 keV He+ is injected into the ZrC/Ni nano-multilayer film,and the total implantation dose is 1.0 × 1017 ions/cm2.The irradiated nano-multilayer film still has good structural stability;the 100nm*2 group with relatively poor structural stability in the irradiation experiment of ZrC/Ni nano-multilayer film continued the vacuum high-temperature annealing experiment and found that annealing The later sample is still composed of an amorphous zirconium carbide layer and a crystalline nickel layer,which has good thermal stability.4)The high-temperature helium irradiation experiment was carried out on the zirconium carbide crystal material.When the total irradiation dose was 2.0 ×1017 ions/cm2,the zirconium carbide crystal material had good structural stability and no amorphization was found;when the total injection When the dose is increased to 5.0×1017 ions/cm2,the zirconium carbide crystal material at this time shows some amorphous tendency but still maintains the structure of the zirconium carbide crystal. |
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