High-conductivity titanium fiber felt

Abstract

A high-conductivity titanium fiber felt comprises a titanium fiber felt layer, conductive silver wire layers are arranged on the front face and the back face of the titanium fiber felt layer in a silk-screen printing mode, the wire diameter of a silk-screen printing plate for silk-screen printing ranges from 10 micrometers to 25 micrometers, the mesh number ranges from 200 meshes to 400 meshes, the thickness of the conductive silver wire layers ranges from 10 micrometers to 35 micrometers, and the thickness of the conductive silver wire layers ranges from 10 micrometers to 35 micrometers. And the conductive silver wire layer is composed of a plurality of silver wires which are uniformly arranged on the titanium fiber felt layer and have the width of 25-65 microns. The conductive silver wire layer is printed outside the titanium fiber felt layer by adopting a silk-screen printing process, so that on one hand, the conductivity is improved, the hydrogen output rate is effectively increased, on the other hand, the printed silver wire layer can effectively control the use amount of noble metal silver, and meanwhile, the subsequent sintering speed can be improved and the production efficiency can be improved by adopting silver paste printing; and the production cost is greatly saved.

Description

Technical Field

[0001] The utility model relates to the field of hydrogen energy application materials, in particular to a titanium fiber felt with high conductivity. Background Art

[0002] Among the various methods of hydrogen production, water electrolysis has a rapidly expanding market due to its small size, fast response speed and more environmentally friendly characteristics. It has become the most important way to produce green hydrogen in the current market.

[0003] Hydrogen is produced in a water electrolyzer by using a DC power supply to transmit current to the electrolyte, triggering a water electrolysis reaction. During the reaction, oxygen is generated at the anode and released from the cell, while hydrogen is generated at the cathode and released from the cell. In addition to the key cathode and anode materials, the commonly used materials in water electrolyzers also include a crucial diffusion layer material. Since water electrolyzers produce gas, porous materials are usually selected as diffusion layer materials. The most commonly used material in the market is titanium fiber felt porous material. Titanium fiber felt is chosen because titanium has excellent corrosion resistance, high specific strength, high mechanical strength and long life. However, since the conductivity of titanium is not high, it is difficult to achieve a high efficiency of hydrogen production, so it is necessary to improve the titanium fiber felt to increase the conductivity, thereby increasing the efficiency of hydrogen production. Utility Model Content

[0004] The utility model solves the shortcomings of the prior art and provides a high-conductivity titanium fiber felt which can improve the conductivity and the hydrogen generation efficiency.

[0005] To achieve the above object, the utility model firstly proposes a high-conductivity titanium fiber felt, comprising a titanium fiber felt layer, on the outer surface of which a conductive silver wire layer is screen-printed.

[0006] In this embodiment, the screen printing screen wire diameter is 10-25 μm, and the mesh number is 200-400 meshes.

[0007] In this embodiment, the thickness of the conductive silver wire layer is 10-35 μm, and the conductive silver wire layer is composed of a plurality of silver wires with a width of 25-65 μm and uniformly arranged on the titanium fiber felt layer. After the silver paste is screen-printed, silver wires that are parallel to each other and uniformly spaced are formed on the titanium fiber felt layer. By adjusting the thickness and width of the silver wires, an optimal balance can be achieved between the amount of silver paste used and the conductivity, so that the least amount of silver paste is used for printing and the best conductivity is achieved.

[0008] In this embodiment, the titanium fiber felt layer is composed of 1 to 5 layers of titanium fiber felt matrix, and the wire diameter of the metal titanium fiber in each layer of titanium fiber felt matrix is ​​5 μm to 30 μm, and the wire length is 10 to 65 mm.

[0009] In the present embodiment, the titanium fiber felt layer adopts three layers of titanium fiber felt matrix, namely a first titanium fiber felt matrix, a second titanium fiber felt matrix and a third titanium fiber felt matrix. The metal titanium fiber filaments in the first titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm, the metal titanium fiber filaments in the second titanium fiber felt matrix have a wire diameter of 7um and a wire length of 35mm, and the metal titanium fiber filaments in the third titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm.

[0010] In this embodiment, conductive silver wire layers are screen-printed on both the front and back sides of the titanium fiber felt layer.

[0011] With the above structure, the utility model has the following advantages:

[0012] 1. The conductive silver wire layer is printed on the outside of the titanium fiber felt layer by screen printing, so that the titanium fiber felt layer has high conductivity, which solves the problem of low conductivity of the hydrogen diffusion layer of the water electrolyzer and insufficient hydrogen production, and can effectively increase the hydrogen output rate;

[0013] 2. The conductive silver wire layer is printed on the outside of the titanium fiber felt layer using a screen printing process. While improving the conductivity, it effectively controls the amount of precious metal silver. At the same time, the use of silver paste printing can increase the speed of subsequent sintering, greatly saving production costs.

[0014] 3. In the present application, conductive silver wire layers are printed on both sides of the titanium fiber felt layer, which further improves the hydrogen production rate compared with single-sided printing.

[0015] In summary, the utility model adopts the screen printing process to print the conductive silver wire layer outside the titanium fiber felt layer, which improves the conductivity and effectively increases the hydrogen production rate on the one hand, and on the other hand, printing the silver wire layer can effectively control the amount of precious metal silver. At the same time, the use of silver paste printing can increase the speed of subsequent sintering, increase production efficiency, and greatly save production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a top view of the utility model.

[0017] In the attached figure: 1. titanium fiber felt layer; 2. conductive silver wire layer. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention. Embodiment 1:

[0020] like Figure 1 As shown, a high-conductivity titanium fiber felt comprises a titanium fiber felt layer, and conductive silver wire layers are screen-printed on both sides of the titanium fiber felt layer, the screen printing screen wire diameter is 10-25 μm, and the mesh number is 200-400 meshes. After the silver paste is screen-printed, silver wires that are parallel to each other and evenly spaced are formed on the titanium fiber felt layer. The thickness of the conductive silver wire layer is 10-35 μm, and the width of the silver wire is 25-65 μm. The raw material for printing the conductive silver wire layer is silver paste, and the silver paste is mixed with spherical silver powder with a particle size of 0.7-5.0 μm, inorganic glass powder and organic solvent in a mass ratio of 65:7:38. The silver paste is then stirred in a mixer and rolled multiple times through a three-roll mill to a fineness of ≤10 μm. After the conductive silver wire layer is screen-printed on the titanium fiber felt layer, it is quickly sintered in a protective atmosphere to form the high-conductivity titanium fiber felt.

[0021] In this embodiment, the titanium fiber felt layer adopts three layers of titanium fiber felt matrix, namely the first titanium fiber felt matrix, the second titanium fiber felt matrix and the third titanium fiber felt matrix. The metal titanium fiber filaments in the first titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm, the metal titanium fiber filaments in the second titanium fiber felt matrix have a wire diameter of 7um and a wire length of 35mm, and the metal titanium fiber filaments in the third titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm.

[0022] The specific process steps of this application are as follows:

[0023] S1, the first titanium fiber felt matrix, a titanium fiber bundle with a wire diameter of 20um and a wire length of 55mm, is opened;

[0024] S2, the second titanium fiber felt matrix, titanium fiber bundles with a wire diameter of 7um and a wire length of 35mm, are opened;

[0025] S3, the second titanium fiber felt matrix, titanium fiber bundles with a wire diameter of 20um and a wire length of 55mm, are opened;

[0026] S4, the air-laid density of the first titanium fiber felt matrix is ​​200g / m 2 The air-laid density of the second titanium fiber felt matrix is ​​150g / m 2 The air-laid density of the third titanium fiber felt matrix is ​​200g / m 2 , and then stack three layers of titanium fibers;

[0027] S5, first pressure sintering, enter the vacuum furnace, vacuum degree 5×10 -4 Pa, the maximum sintering temperature is 1250℃, and the holding time is 4h;

[0028] S6. The sintered metal fiber felt is calendered using a roller press to a thickness of 0.4 mm to obtain a titanium fiber felt layer with three layers;

[0029] S7, mixing spherical silver powder with a particle size of 0.7 to 5.0 μm, inorganic glass powder, and organic solvent in a mass ratio of 65:7:38 into a silver paste, stirring with a mixer for 60 minutes, and rolling with a three-roll mill for multiple times to a fineness of ≤10 μm;

[0030] S8, printing the silver paste prepared in step S7 on one side of the titanium fiber felt layer in step S6 using a screen printer, and then rapidly sintering in a rapid sintering furnace under a protective atmosphere at a sintering speed of 4 m / min and a sintering temperature of 760° C., and then cooling for 10 min under a protective atmosphere;

[0031] S9, taking out the titanium fiber felt that has been sintered and cooled in step S8, turning it over, and repeating step S8;

[0032] S10, laser cutting the titanium fiber felt that has been sintered and cooled in step S9 to obtain a finished titanium fiber felt of corresponding size.

[0033] In Comparative Example 1, no conductive silver wire layer was printed on both the front and back sides of the titanium fiber felt layer.

[0034] In comparative example 2, the conductive silver wire layer is printed on only one side of the titanium fiber felt layer.

[0035] Example 1 and Comparative Example 1 and Comparative Example 2 are placed in water electrolyzers 1#, 2#, and 3# in the same space, respectively, and form a one-to-one correspondence, that is, Example 1 is placed in water electrolyzer 1#, Comparative Example 1 is placed in water electrolyzer 2#, and Comparative Example 2 is placed in water electrolyzer 3#. Among them, the cathode and anode of the three water electrolyzers and other conditions such as the medium are the same, and only the diffusion material is replaced by the titanium fiber felt in Example 1, Comparative Example 1, and Comparative Example 2.

[0036] The comparison results of contact surface resistance, current density, and hydrogen output per unit time are shown in Table 1.

[0037] Table 1:

[0038]

[0039] It can be seen from Table 1 that the hydrogen output of the high conductivity titanium fiber felt of the present application is higher than that of the titanium fiber felt without a printed conductive silver wire layer, and the hydrogen output of the titanium fiber felt with a double-sided printed conductive silver wire layer is higher than that of a single-sided printed layer.

[0040] The above are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A high conductivity titanium fiber felt, characterized in that: It comprises a titanium fiber felt layer, on the outer surface of which a conductive silver wire layer is screen-printed, the screen wire diameter of the screen printing is 10-25 μm, the mesh number is 200-400 meshes, and the conductive silver wire layer is composed of a plurality of silver wires with a width of 25-65 μm which are evenly arranged on the titanium fiber felt layer.

2. The high conductivity titanium fiber felt according to claim 1, characterized in that: The thickness of the conductive silver wire layer is 10-35 μm.

3. The high conductivity titanium fiber felt according to claim 1, characterized in that: The titanium fiber felt layer is composed of 1 to 5 layers of titanium fiber felt matrix, and the wire diameter of the metal titanium fiber in each layer of titanium fiber felt matrix is ​​5 μm to 30 μm, and the wire length is 10 to 65 mm.

4. The high conductivity titanium fiber felt according to claim 3, characterized in that: The titanium fiber felt layer adopts three layers of titanium fiber felt matrix, namely the first titanium fiber felt matrix, the second titanium fiber felt matrix and the third titanium fiber felt matrix. The metal titanium fiber filaments in the first titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm, the metal titanium fiber filaments in the second titanium fiber felt matrix have a wire diameter of 7um and a wire length of 35mm, and the metal titanium fiber filaments in the third titanium fiber felt matrix have a wire diameter of 20um and a wire length of 55mm.

5. The high conductivity titanium fiber felt according to any one of claims 1 to 4, characterized in that: Conductive silver wire layers are screen-printed on both the front and back sides of the titanium fiber felt layer.

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