A vanadium alloy

Abstract

The application discloses a vanadium alloy coated with a composite structure coating, which comprises an intermediate layer and a surface layer attached on the surface of the vanadium alloy substrate in sequence. The vanadium alloy of the application is coated with the composite structure coating, and the composite structure coating is applied to the surface of the vanadium alloy substrate, so that the service temperature of the vanadium alloy is improved, and the vanadium alloy has the characteristics of low tritium permeability and excellent thermal shock resistance. The application is suitable for the field of composite materials.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of composite materials, and particularly relates to a vanadium alloy. BACKGROUND

[0002] The vanadium alloy has many advantages such as high service temperature (700-750℃), excellent anti-irradiation swelling performance, low neutron irradiation activation, no magnetism, and good plastic processing performance, and is one of the most potential candidate cladding structure materials for future demonstration (DEMO) fusion reactors and commercial fusion reactors. However, due to the strong affinity of the vanadium alloy with H2 and O2, the vanadium alloy applied to a He-cooled solid-state cladding will face problems of high tritium permeation and high-temperature oxidation, resulting in a large loss of tritium and high-temperature oxidation corrosion and brittleness of the vanadium alloy.

[0003] Applying a tritium-blocking coating and a high-temperature oxidation-resistant coating is one of the most effective solutions to the high tritium permeation and high-temperature oxidation of the vanadium alloy. For the tritium-blocking coating, Peng Xuxing et al. prepared a V-Al / Al2O3 coating on the surface of the vanadium alloy by electroplating technology and selective oxidation method. The aluminum plating layer on the surface of the vanadium alloy was analyzed by SEM, EDS and other technologies, and it was shown that the plating layer surface is rough and porous, and contains V-containing compounds such as V(Al / Cr / Ti) phase. For the oxidation-resistant coating, Mathieu et al. performed Si permeation on the surface of the vanadium alloy by embedding method, and obtained a composite coating with a multi-layer structure, and the surface layer is VSi2 phase, which has good oxidation resistance in air atmosphere at 650℃.

[0004] However, the prior art has a common drawback that the surface layer of the coating contains V element. Since the melting point of one of the oxidation products of V, V2O5, is about 680℃, which is lower than the service temperature of the vanadium alloy (700-750℃), that is, all the V-containing coatings cannot be applied above the temperature range of 680℃. SUMMARY

[0005] The technical problem solved by the present application is to provide a vanadium alloy, and the composite structure coating applied to the surface of the vanadium alloy base body can improve the service temperature of the vanadium alloy, and has the characteristics of low tritium permeability and excellent thermal shock resistance.

[0006] To achieve the above-mentioned purpose, the first aspect of the present application provides the following technical scheme:

[0007] A vanadium alloy coated with a composite structure coating, wherein the composite structure coating comprises an intermediate layer and a surface layer attached to the surface of the vanadium alloy base body in sequence.

[0008] The intermediate layer is metal Ti, Ti alloy, metal Cr, Cr alloy, metal Ta, Ta alloy, metal Zr, Zr alloy, metal Fe or low-activation steel, the thickness of the intermediate layer is 1-10000 μm; the surface layer is one or several of enamel layer, ceramic layer or alloy layer, the surface layer contains one or several of SiO2, B2O3, Al2O3, TiO2, BaO, Na2O, K2O, CeO2, the thickness of the surface layer is 1-10000 μm;

[0009] The service temperature of the vanadium alloy is any temperature in the range of 500-1200℃.

[0010] As an embodiment of the present application, the intermediate layer is metal Ti, Ti alloy, metal Cr, Cr alloy, metal Zr, Zr alloy, metal Fe or low-activation steel, the thickness of the intermediate layer is 100-5000 μm; the surface layer is one or several of enamel layer, ceramic layer or alloy layer, the surface layer contains one or several of SiO2, B2O3, Al2O3, TiO2, BaO, Na2O, K2O, MgO, ZnO, CaO, Y2O3, Cr, Cr2O3, Er2O3, CeO2, the thickness of the surface layer is 10-200 μm;

[0011] The service temperature of the vanadium alloy is any temperature in the range of 500-750℃.

[0012] As an embodiment of the present application, the vanadium alloy substrate is one or several of metal V, V-Ti alloy, V-Cr alloy and V-Cr-Ti alloy.

[0013] As an embodiment of the present application, the service temperature of the vanadium alloy is any temperature in the range of 700-1100℃.

[0014] As an embodiment of the present application, the service temperature of the vanadium alloy is any temperature in the range of 900-1000℃.

[0015] As an embodiment of the present application, the hydrogen permeation rate of the composite structure coating in the range of 500-700℃ is 10 -15 -10 -10 molm -1 s -1 MPa -1 , preferably 10 -14 -10 -11 molm -1 s -1 MPa -1 , further preferably 10 -13 -10 -12 molm -1s - 1 MPa -1 .

[0016] The above technical solution provided by the present application at least brings the following beneficial effects:

[0017] The vanadium alloy is coated with the composite structure coating, and the composite structure coating is applied to the surface of the vanadium alloy substrate, so that the service temperature of the vanadium alloy is improved, and the vanadium alloy has low tritium permeability and excellent thermal shock resistance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The figure is a structural schematic diagram of the vanadium alloy of the present application. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clear, the embodiments of the present application will be further described in detail.

[0020] Example 1

[0021] The vanadium alloy described in the present application is prepared by the following method:

[0022] 1) The vanadium alloy and the metal titanium interlayer material are diffusion welded to prepare a vanadium alloy-metal titanium composite material by a hot isostatic pressing method, wherein the operating conditions of the hot isostatic pressing method are: in a high vacuum or inert gas atmosphere, temperature 900℃, pressure 2MPa, time 1h; 2) The porcelain enamel slurry sieved through a 200 mesh screen is coated on the surface of the metal titanium interlayer, dried and then fired, and the firing conditions are: in a high vacuum or inert gas atmosphere, temperature 950℃, time 10 minutes, to obtain a vanadium alloy coated with a "vanadium alloy / metal titanium interlayer / porcelain layer" composite structure coating.

[0023] The thickness of the metal titanium interlayer prepared above is 5000μm, and the thickness of the porcelain surface layer is 100μm. The service temperature of the vanadium alloy is any temperature in the range of 500-700℃; the hydrogen permeability of the composite structure coating in the range of 500-700℃ is 10 -10 -10 -8 molm -1 s -1 MPa -1 .

[0024] In addition, the composite structure coating prepared by the above method is subjected to thermal shock experiment, and the experimental conditions are as follows: the coating sample is placed in a muffle furnace at 800 DEG C for 5 min, then immediately taken out and put into water to cool to room temperature (about 25 DEG C). The two stages of 800 DEG C heat preservation and cooling to room temperature in water of the coating sample are regarded as one experimental cycle. After 10 cycles of thermal shock experiment, the enamel coating is still dense and complete, and the surface does not appear defects such as cracking and peeling, indicating that the enamel coating has excellent thermal shock resistance.

[0025] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vanadium alloy characterized by, The vanadium alloy is coated with a composite structure coating, which comprises an intermediate layer and a surface layer attached on the surface of the vanadium alloy substrate in sequence; 1) Vanadium alloy and metal titanium interlayer material are diffusion welded by hot isostatic pressing to prepare vanadium alloy Metal titanium composite material, wherein the hot isostatic pressing operation conditions are: high vacuum or inert gas atmosphere, temperature 900℃, pressure 2MPa, time 1h; 2) applying the porcelain enamel slurry with a mesh size of 200 to the surface of the metal titanium intermediate layer, drying and then firing under the conditions of high vacuum or inert gas atmosphere, temperature 950℃, time 10 minutes, to obtain a vanadium alloy coated with a "vanadium alloy / metal titanium intermediate layer / porcelain layer" composite structure coating; The surface layer contains one or more of SiO2, B2O3, Al2O3, TiO2, BaO, Na2O, K2O, MgO, ZnO, CaO, Y2O3, Cr, Cr2O3, Er2O3, and CeO2; The thickness of the prepared metal titanium intermediate layer is 5000 μm, the thickness of the enamel surface layer is 100 μm, and the service temperature of the vanadium alloy is 500 700 ℃; the hydrogen permeability of the composite structure coating in the range of 500 700 ℃ is 10 -10 10 - 8 molm -1 s -1 MPa -1 ; after the thermal shock experiment for 10 cycles, the enamel coating is still dense and complete, and no cracking and peeling defects appear on the surface, indicating that the enamel coating has excellent thermal shock resistance.

2. The vanadium alloy of claim 1, wherein, The vanadium alloy substrate is one or more of metal V, V-Ti alloy, V-Cr alloy, and V-Cr-Ti alloy.

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