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a uranium surface uc 1-x no x Solid solution preparation method, its product and application
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A uc1-xnx, solid solution technology, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problems of UC-UN solid solution impurity phase difference, long preparation time, unavoidable, etc. Impurities and other phases are highly controllable, the preparation method is simple, and the work efficiency is high.
Active Publication Date: 2020-11-17
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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[0005] J.WILLIAMS et al. used UC and UN as raw materials to prepare UC-UN solid solution by solid-state diffusion at 1200°C (J.WILLIAMS, R.A.J.SAMBELL, JOURNAL OF THE LESS-COMMON METALS, 1(1959) 217-226), The working time of this preparation method is as long as dozens of hours or even more than 100 hours, and it is difficult to avoid metal uranium, U 2 C 3 、UC 2 appearance of matter
[0006] T.NOMURA et al. use UC+N 2 Or the reaction of UN+ graphite to prepare UC-UN solid solution (T.NOMURA, M.KATSURA and T.SANO, ON THE FORMATION OF UC-UN SOLID SOLUTIONS, JOURNAL OFNUCLEAR MATERIALS 43(1972) 234-244.), the method used The equipment is complex and the preparation time is long. In addition to the UC-UN solid solution, there are also U 2 C 3 、UC 2 , graphite and other non-target phases, and the UC-UN solid solution impurity phases prepared by different experimental groups are quite different, so that this is used as a raw material to study UC 1-x N x There is a large difference in performance
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Embodiment 1
[0048] Preparation of UC on the surface of metal uranium 1-x N x solid solution, UC 1-x N x The solid solution has a NaCl structure, which can be obtained by adjusting the carbon-containing gas source (in this embodiment, the carbon-containing gas source adopts CH 4 , others such as C 2 h 4 、C 2 h 2 can be), N 2 Divider ratio modulation UC 1-x N x The proportion of C and N elements in the solid solution.
[0049] In this example, the uranium surface UC 1-x N x The solid solution preparation parameters are shown in Table 1.
[0050] Table 1 Uranium surface UC 1-x N x Solid Solution Preparation Parameters
[0051]
[0052] (1) The preparation process is as follows.
[0053] First, remove the oxide layer on the surface of uranium, then use alcohol, acetone, and compressed nitrogen to clean the surface of the metal uranium from which the oxide layer has been removed, and then put the cleaned metal uranium into a vacuum chamber. Then, the vacuum chamber is evacu...
Embodiment 2
[0060] UC prepared on metal uranium surface 1-x N x As a corrosion protective layer on the surface of uranium materials, solid solution has a good protective effect. The relevant tests are as follows.
[0061] (1) Prepare UC on the surface of uranium according to the process method in Example 1 1-x N x Solid solution, obtain modified samples, and perform electrochemical tests in NaCl solution with a solubility of 0.02mol / L, and the effective test area of the samples is 1cm 2 , get as Figure 6 The electric polarization curve is shown. Figure 6 Among them, 1:2, 1:1, and 2:1 respectively represent CH in the preparation process 4 and N 2 partial pressure ratio.
[0062] The results showed that, with no UC prepared on the surface 1-x N x solid solution of the depleted uranium sample compared to the surface prepared by the UC 1-x N x The equilibrium corrosion current density of solid solution samples decreases, and the equilibrium corrosion potential increases, especi...
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Abstract
The invention discloses a preparation method, product and application of a uranium surface UC1-xNx solid solution with an aim to solve problems about long working time and difficulty in avoiding appearance of metallic uranium, U2C3 and UC2 phases when a UC-UN solid solution is prepared through a solid-state diffusion method at the condition of 1200DEG C by taking UC and UN as raw materials in theprior art. Under the premise of controlling impurities of a vacuum chamber and in the mixed atmosphere of CH4 (other carbon-containing gas sources, such as C2H4 and C2H2) and N2, the metallic uraniumis taken as a matrix, and the UC1-xNx solid solution is prepared on the uranium surface by the aid of pulsed laser. In the uranium surface UC1-xNx solid solution, the x value (the ratio of C to N) canbe modulated by changing the partial pressure between hydrocarbon gas source and N2, and when the partial pressure of N2 is between 0.7 and 1, a modified layer has excellent protective effect on theuranium matrix. The uranium surface UC1-xNx solid solution singular in phase can be used as the raw material for study on properties of a candidate nuclear fuel UC-UN material system and has high application value and good application prospect.
Description
technical field [0001] The invention relates to the field of metal protection, especially the field of anti-corrosion of active metal surfaces, in particular to a uranium surface UC 1-x N x Solid solution preparation method, its product and application. The solid solution prepared by the invention has a single phase and stable properties, and can effectively improve the corrosion resistance of the surface of the uranium material. Background technique [0002] As an important material, uranium metal is widely used in the field of nuclear engineering. However, the uranium material is active, and it is very easy to mix with the environment medium (such as O 2 、H 2 O.CO 2 etc.) chemical and electrochemical effects occur, resulting in corrosion, which in turn affects the physical, chemical and nuclear properties of uranium materials. Therefore, it is of great significance to improve the corrosion resistance of uranium metal. [0003] The protective modified layer based on ...
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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/30
CPCC23C8/30
Inventor 刘柯钊钟火平莫川张永彬胡殷陈志磊吴艳萍孙超伦
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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