A honeycomb sandwich composite electrode structure

Abstract

The utility model provides a kind of honeycomb sandwich composite electrode structure, it is related to molybdenum electrode oxidation resistance technical field, it includes: molybdenum matrix;Honeycomb core layer, by multiple honeycomb units connection composition, honeycomb core layer is located on the outer wall surface of molybdenum matrix;Each honeycomb unit and the cavity formed between the outer wall surface of molybdenum matrix, each honeycomb unit has first gas passage, one end of each first gas passage and corresponding cavity communication, other end extends to the outer surface of honeycomb core layer towards protective layer;Protective layer, it is located on the outer surface of honeycomb core layer, protective layer has multiple second gas passage;Wherein, second gas passage and first row passage number are consistent, and each second gas passage and corresponding first gas passage are communicated with each other.The electrode structure can protect molybdenum electrode, and greatly slow down the oxidation rate of molybdenum electrode.

Description

Technical Field

[0001] This utility model relates to the field of molybdenum electrode anti-oxidation technology, specifically to a honeycomb sandwich composite electrode structure. Background Technology

[0002] Currently, molybdenum electrodes have a problem with easy oxidation during use. For example, they are easily oxidized when heated in air, generating MoO3 at around 600℃. The formation of molybdenum oxide will eventually lead to the melting of the electrode. In mild cases, it will reduce the service life of the electrode, and in severe cases, it will affect the stability of production and product quality. Fixed electrodes are generally protected by electrode water jackets, mainly by reducing the electrode temperature so that it cannot reach the oxidation temperature and thus slows down the oxidation rate. However, for temporary electrodes, due to factors such as their non-fixed location and non-fixed usage time, it is difficult to protect them with electrode water jackets. Utility Model Content

[0003] To address the problem that molybdenum electrodes are easily oxidized to form MoO3 during use, thus affecting their service life, production stability, and product quality, this invention provides a honeycomb sandwich composite electrode structure that can protect the molybdenum electrode and significantly slow down its oxidation rate.

[0004] The technical solution adopted in this utility model is:

[0005] A honeycomb sandwich composite electrode structure is provided, comprising:

[0006] Molybdenum matrix;

[0007] The honeycomb core layer is composed of multiple honeycomb units connected together and is disposed on the outer wall surface of the molybdenum substrate. A cavity is formed between each honeycomb unit and the outer wall surface of the molybdenum substrate. Each honeycomb unit has a first gas channel. One end of each first gas channel is connected to the corresponding cavity, and the other end extends to the outer surface of the honeycomb core layer facing the protective layer.

[0008] A protective layer is disposed on the outer surface of the honeycomb core layer, and the protective layer has multiple second gas channels;

[0009] The number of second gas channels is the same as that of the first row of channels, and each second gas channel is connected to the corresponding first gas channel.

[0010] Optionally, the cellular unit includes:

[0011] Multiple fixed plates are connected end to end to form a honeycomb unit with a regular polygonal cross section;

[0012] The cover plate, which is the same as the regular polygonal structure composed of multiple fixed plates, is located on the inner wall of each fixed plate and is used to seal the end of the cellular unit facing the protective layer.

[0013] Each cellular unit has at least two first gas channels inside, and the multiple first gas channels are located inside any two or more of the multiple fixed plates.

[0014] Optionally, the protective layer includes a protective plate disposed on the outer wall surface of the honeycomb unit, and a plurality of second gas channels are located inside the side wall surface of the protective plate, with adjacent second gas channels spaced apart.

[0015] Optionally, the fixing plate is a Mo-SiC composite material plate.

[0016] Optionally, the protective plate is made of Mo-Si alloy or Mo-B alloy.

[0017] Optionally, the cross-sectional area at the connection between adjacent first gas channels and adjacent second gas channels is smaller than the cross-sectional area of ​​the first gas channel.

[0018] Optionally, the connection between each first gas channel and the cavity is an inclined plane, offset from the central axis of the honeycomb unit by 30° to 60°.

[0019] Optionally, a transition layer is provided between the honeycomb core layer and the protective layer. The transition layer includes a Mo-Si alloy, which is connected between the honeycomb core layer and the protective layer by diffusion welding or plasma spraying.

[0020] The beneficial effects of this utility model are:

[0021] By sequentially setting a honeycomb core layer and a protective layer along the radius-increasing direction on the surface of the molybdenum substrate, oxygen must first pass through the protective layer before entering the surface of the molybdenum electrode and undergoing oxidation. The protective layer has multiple second gas channels through which oxygen enters the interior of the protective layer. After entering the multiple second gas channels of the protective layer, the oxygen then passes through the protective layer and enters the surface of the honeycomb core layer. The honeycomb core layer is composed of multiple interconnected honeycomb cells, each of which has a first gas channel. A cavity is formed between each honeycomb cell and the outer wall of the molybdenum substrate. Each first gas channel connects the cavity to the second gas channel of the protective layer. That is, after oxygen enters the surface of the honeycomb core layer through the protective layer, it flows on the surface of the honeycomb core layer until it finds the entrance of the first gas channel, and then enters through the first gas channel, finally entering the interior of the cavity. By prolonging the speed at which oxygen enters the outer surface of the molybdenum substrate, rapid oxidation of the molybdenum substrate is avoided. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the front view of a honeycomb sandwich composite electrode structure according to the present invention;

[0024] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0025] Figure 3 This is a schematic diagram of the connection structure between multiple cellular units in the cellular core layer.

[0026] Figure 4 This is a schematic diagram showing the connection method between the honeycomb core layer and the protective layer.

[0027] Figure label:

[0028] 1-Molybdenum matrix;

[0029] 2-Honeycomb core layer, 20-Fixing plate, 21-Cover plate, 22-Cavity, 23-First gas channel;

[0030] 3-Protective layer, 30-Protective plate, 31-Second gas channel; 4-Transition layer. Detailed Implementation

[0031] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0032] The following disclosure provides many different embodiments or examples for implementing various structures of this invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this invention.

[0033] The embodiments of the utility model will now be described in detail with reference to the accompanying drawings.

[0034] Example

[0035] Please see Figure 1-4 As shown, this embodiment discloses a honeycomb sandwich composite electrode structure, including a molybdenum substrate 1. A honeycomb core layer 2 and a protective layer 3 are sequentially disposed on the outer wall surface of the molybdenum substrate 1 along the direction of increasing radius of the molybdenum substrate 1. The honeycomb core layer 2 can protect the molybdenum substrate 1, preventing the molybdenum substrate 1 from direct oxidation and volatilization at high temperatures. In addition, the honeycomb structure can also reduce thermal stress concentration. The protective layer 3 can cooperate with the honeycomb core layer 2 to form a protective film at high temperatures, enhancing the protective effect on the molybdenum substrate 1. Furthermore, the combined use of the honeycomb core layer 2 and the protective layer 3 can delay the high-temperature oxidation of the molybdenum substrate 1 after oxygen enters through the protective layer 3 and the honeycomb core layer 2 by extending the oxygen transport path.

[0036] Specifically, the aforementioned honeycomb core layer 2 is composed of multiple honeycomb units connected together. Each honeycomb unit includes multiple fixing plates 20 and a cover plate 21. The multiple fixing plates 20 are arranged sequentially around each other and connected end to end to form a hollow structure similar to a honeycomb. Then, a cover plate 21 is placed on top of the honeycomb structure composed of multiple fixing plates 20 to cover it, so that a cavity 22 is formed between the interior of the honeycomb structure and the surface of the molybdenum substrate 1. In this embodiment, there are six fixing plates 20, and the six fixing plates 20 form a regular hexagonal honeycomb structure. The cover plate 21 is a regular hexagonal cover plate 21 corresponding to the regular hexagonal honeycomb structure. It is worth noting that the honeycomb structure can be other regular polygons, such as equilateral triangles, regular quadrilaterals, etc. In this regular hexagonal honeycomb structure, a first gas channel 23 is opened inside three non-adjacent fixing plates 20. One end of the first gas channel 23 is located on the side wall of the fixing plate 20 facing the inside of the cavity 22, and the other end is located at the end of the fixing plate 20 away from the molybdenum substrate 1. Gas enters from one end of the first gas channel 23 and then exits from the other end of the first gas channel 23 into the inside of the cavity 22. This first gas channel 23 extends the path for oxygen to enter the surface of the molybdenum substrate 1 and slows down the oxidation rate of the molybdenum substrate 1.

[0037] The aforementioned protective layer 3 includes a protective plate 30, which is a hollow cylindrical protective plate 30. The protective plate 30 is arranged around the honeycomb core layer 2 and connected to the surface of the honeycomb core layer 2. Specifically, the inner wall surface of the protective plate 30 is connected to the end of each fixing plate 20 of the cover plate 21 in the honeycomb core layer 2 away from the molybdenum substrate 1. Multiple second gas channels 31 are opened on the side wall surface of the anti-slip plate. One end of each second gas channel 31 extends to the outer wall surface of the anti-slip plate facing the external environment, and the other end extends to the inner wall surface of the anti-slip plate facing the honeycomb core layer 2. The number of second gas channels 31 is the same as the number of first gas channels 23. Corresponding to and connected to 23, it should be noted that the aperture of the second gas channel 31 facing the honeycomb core layer 2 is much larger than the aperture of the first gas channel 23 facing the protective plate 30. When oxygen enters through the first gas channel 23 of the protective layer 3 and exits from the other end of the first gas channel 23, due to the smaller aperture of the second gas channel 31, the oxygen exiting through the first gas channel 23 will need to take a certain amount of time to find the entrance of the second gas channel 31 that is connected to the first gas channel 23. Then the oxygen will enter the cavity 22 through the second gas channel 31. The whole process delays the time for oxygen to enter the surface of the molybdenum substrate 1 for high-temperature oxidation.

[0038] In this embodiment, the fixing plate 20 is selected as a Mo-SiC composite material plate, and the protective plate 30 is selected as a Mo-Si alloy or Mo-B alloy. The Mo-SiC composite material plate of the fixing plate 20 is formed by ball milling molybdenum powder (particle size 5-20μm) and SiC particles (1-5μm) in proportion using powder metallurgy process, forming a honeycomb structure preform under cold isostatic pressing (pressure 200-300MPa), and finally sintering at high temperature (1600-1800℃) under hydrogen protection. The molybdenum powder diffuses and bonds, while the SiC particles remain at the grain boundaries. Its function is that the SiC particles enhance the hardness and creep resistance of the molybdenum matrix 1, and the SiO2 protective film generated by SiC oxidation can cover the surface of the honeycomb core layer 2 to prevent the molybdenum matrix 1 from oxidizing. The protective plate 30 is selected as a Mo-Si alloy or Mo-B alloy so that silicon (Si) or boron (B) elements exist in the porous molybdenum matrix 1 in the form of atomic-level solid solution or nanoparticles, forming a Mo-Si or Mo-B alloy. The composite method is achieved through powder metallurgy + silicon / boron infiltration process. Specifically, molybdenum powder is mixed with a pore-forming agent (such as ammonium carbonate), cold-pressed, and then sintered to form a porous structure (porosity 30-50%). The next step is to select a silicon or boron infiltration process. Taking silicon infiltration as an example, it involves heating in a silicon vapor environment (120°C). (0~1400℃), silicon atoms diffuse into the molybdenum lattice; taking boron infiltration as an example, it is through boron powder embedding infiltration process to form MpB2 or Mo2B5 phase, that is, Si / B elements preferentially oxidize at high temperature to generate SiO2 / B2O3 glass film, which protects the porous layer, and the porous structure can adsorb silica sol, which works with the honeycomb core layer 2 to form a continuous protective layer. It is worth noting that silica sol is the SiO2 precursor released by the protective plate 30 at high temperature, and its vapor condenses into submicron-sized SiO2 particles (0.1~1μm in diameter) in the pores.

[0039] The first gas channel 23 is inclined at one end facing the inner wall of the fixing plate 20, and the inclined surface is offset from the central axis of the honeycomb structure by 30° to 60°. The inclined arrangement of the first gas channel 23 can delay the time when some of the permeated oxygen enters the surface of the molybdenum substrate 1.

[0040] A transition layer 4 is provided between the honeycomb core layer 2 and the protective layer 3. The transition layer 4 is a Mo-Si alloy. The Mo-Si alloy is connected between the honeycomb core layer 2 and the protective layer 3 by diffusion welding or plasma spraying. It is mainly used for thermal stress buffering and oxygen diffusion barrier.

[0041] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A honeycomb sandwich composite electrode structure, characterized in that, include: Molybdenum matrix; The honeycomb core layer is composed of multiple connected honeycomb units and is disposed on the outer wall surface of the molybdenum substrate. A cavity is formed between each of the honeycomb cells and the outer wall of the molybdenum substrate. Each of the honeycomb cells has a first gas channel. One end of each first gas channel is connected to the corresponding cavity, and the other end extends to the outer surface of the honeycomb core layer facing the protective layer. A protective layer is disposed on the outer surface of the honeycomb core layer, and the protective layer has a plurality of second gas channels; The number of second gas channels is the same as that of the first row of channels, and each second gas channel is connected to the corresponding first gas channel.

2. The honeycomb sandwich composite electrode structure according to claim 1, characterized in that, The cellular unit includes: Multiple fixing plates are connected end to end in sequence to form a honeycomb unit with a regular polygonal cross section; A cover plate, which is identical to the regular polygonal structure formed by multiple fixed plates, is disposed on the inner wall surface of each fixed plate and is used to seal the end of the honeycomb unit facing the protective layer. Each of the cellular units has at least two first gas channels inside, and the plurality of first gas channels are located inside any two or more of the plurality of fixed plates.

3. The honeycomb sandwich composite electrode structure according to claim 2, characterized in that, The protective layer includes a protective plate disposed on the outer wall surface of the cellular unit, and a plurality of second gas channels are located inside the side wall surface of the protective plate, with adjacent second gas channels spaced apart.

4. The honeycomb sandwich composite electrode structure according to claim 3, characterized in that, The fixing plate is a Mo-SiC composite material plate.

5. The honeycomb sandwich composite electrode structure according to claim 4, characterized in that, The protective plate is made of Mo-Si alloy or Mo-B alloy.

6. The honeycomb sandwich composite electrode structure according to claim 5, characterized in that, The cross-sectional area of ​​the connection between the adjacent first gas channel and the adjacent second gas channel is smaller than the cross-sectional area of ​​the first gas channel.

7. The honeycomb sandwich composite electrode structure according to claim 6, characterized in that, The connection between each of the first gas channels and the cavity is an inclined plane, offset from the central axis of the honeycomb unit by 30° to 60°.

8. The honeycomb sandwich composite electrode structure according to claim 7, characterized in that, A transition layer is provided between the honeycomb core layer and the protective layer. The transition layer includes a Mo-Si alloy, which is connected between the honeycomb core layer and the protective layer by diffusion welding or plasma spraying.

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