WO2023087445A1

WO2023087445A1 - Method for preparing metal support plate for fuel cell

Info

Publication number: WO2023087445A1
Application number: PCT/CN2021/137651
Authority: WO
Inventors: 包崇玺; 陈志东; 颜巍巍; 童璐佳
Original assignee: 东睦新材料集团股份有限公司
Priority date: 2021-11-22
Filing date: 2021-12-14
Publication date: 2023-05-25
Also published as: CN114188561A

Abstract

The present invention relates to a method for preparing a metal support plate for a fuel cell. The method sequentially comprises the following steps: 1) selecting a metal wire mesh; 2) fold or stack the wire mesh in step 1); 3) rolling or pressing the folded or stacked wire mesh, and then sintering same; 4) cutting the sintered multi-layer wire mesh; 5) forming an anode layer on an upper surface of a metal substrate; 6) forming an electrolyte coating on an upper surface of the anode layer; and 7) forming a cathode layer on an upper surface of the electrolyte coating, thereby fabricating a metal support plate. A multi-layer wire mesh folded or stacked by using metal wire mesh is used as a metal connecting plate, thereby allowing the final prepared metal support plate to have high strength and small deformation.

Description

A kind of preparation method for the metal support plate of fuel cell

technical field

The invention belongs to the technical field of fuel cells, and in particular relates to a method for preparing a metal support plate for a fuel cell.

Background technique

The solid oxide fuel cell is an ideal fuel cell, which not only has the advantages of high efficiency and environmental friendliness of the fuel cell, but also has the following outstanding advantages: (1) The solid oxide fuel cell is an all-solid structure, and there is no liquid electrolyte band Corrosion problems and electrolyte loss problems in the future are expected to achieve long-life operation. (2) The operating temperature of the solid oxide fuel cell is 800-1000°C. Not only does the electrocatalyst not need to use noble metals, but it can also directly use natural gas, coal gas and hydrocarbons as fuel, which simplifies the fuel cell system. (3) Solid oxide fuel cells discharge high-temperature waste heat and can form a combined cycle with gas turbines or steam turbines to greatly improve the total power generation efficiency.

The current metal-supported solid oxide fuel cell is such as the Chinese invention patent application "A Preparation Method for a Metal Support Plate for Fuel Cell" previously applied by the applicant, whose patent application number is CN202110298584.5 (application publication number For CN113161566A) discloses a kind of preparation method for the metal supporting plate of fuel cell, comprises the following steps successively: 1) adopts in stainless steel, heat-resistant steel, nickel-based alloy, cobalt-based alloy, titanium alloy, chromium-based alloy A; 2) making the material in step 1) into a metal substrate; 3) processing micropore pores with a diameter of 0.005 to 0.5 mm on the metal substrate, and the area of the pores accounts for 3 to 70% of the total area of the plate; 4) making Cutting the plate containing the pores into the required size; 5) coating the anode slurry on the upper surface of the metal substrate to form an anode layer on the upper surface of the metal substrate; 6) coating the electrolyte slurry on the anode layer 7) coating the cathode slurry on the upper surface of the electrolyte coating to form a cathode layer on the upper surface of the electrolyte coating, thereby making a metal support plate. The metal support plate made of the above metal substrate is prone to deformation, uneven pore size, unstable gas flow and other defects.

Therefore, it is necessary to further improve the existing methods for preparing metal support plates for fuel cells.

Contents of the invention

The technical problem to be solved by the present invention is to provide a method for preparing a metal support plate for a fuel cell in view of the above-mentioned current state of the art, so that the prepared metal support plate is not easily deformed and has high tensile strength.

The technical solution adopted by the present invention to solve the above technical problems is: a method for preparing a metal support plate for a fuel cell, which is characterized in that it includes the following steps in sequence:

1) adopt mesh number to be 40～2000 mesh wire mesh, the material of described wire mesh is stainless steel and/or superalloy;

2) According to the thickness of the target metal support plate, the wire mesh in step 1) is folded or stacked to obtain a multi-layer wire mesh, and the number of folded or stacked layers is 2 to 100 layers;

3) rolling or pressing the screen layer in step 2), and then sintering;

4) cutting the sintered multi-layer screen to obtain a metal substrate;

5) coating the anode slurry on the upper surface of the trimmed metal substrate, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming an anode layer on the upper surface of the metal substrate;

6) coating the electrolyte slurry on the upper surface of the anode layer, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming an electrolyte coating on the upper surface of the anode layer;

7) coating the cathode slurry on the upper surface of the electrolyte coating, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming a cathode layer on the upper surface of the electrolyte coating, A metal support plate is thus produced.

Preferably, the sintering temperature in step 3) is 1000°C-1350°C, and the sintering holding time is 5-500min. After sintering, the metal support plate has high strength, and at the same time, the anode and the metal support plate are tightly bonded. The co-sintering of the anode, electrolyte and cathode can improve production efficiency, reduce production costs, and improve the bonding state of the three interfaces of the metal support plate-anode-electrolyte-cathode.

There are many ways of pressing, but preferably, the pressing in step 3) adopts: place a support plate under the multi-layer screen, place a ceramic pressing plate above the multi-layer screen, and place a heavy object on the top of the ceramic pressing plate to support The plate is ceramic support plate or graphite support plate, and the weight is heat-resistant steel or tungsten alloy. The use of heat-resistant steel or tungsten alloy for pressing can ensure that the bonding force between each layer of nets after sintering is strong and these materials can be reused to reduce sintering costs.

Further preferably, during sintering, the multi-layer wire mesh, support plate, ceramic pressing plate and weights are put together into a sintering furnace for sintering.

Preferably, the wire mesh is austenitic, or ferritic stainless steel, or heat-resistant stainless steel; the superalloy is GH3030, or GH4037.

Preferably, each layer of the folded multi-layer screen has the same mesh number.

Specifically, sintering is carried out after drying in step 5), step 6) and step 7), the sintering temperatures used in the sintering in step 5) and the sintering in step 6) are all 1050°C to 1400°C, and the sintering The time is 10-300 min. The sintering temperature used in step 7) is 800°C-1200°C, the sintering time is 5-300 min, and the vacuum degree is 10 ^-3 Pa-10 ² Pa.

In order to improve the strength and air permeability of the multi-layer wire mesh, in the stacked multi-layer wire mesh, the mesh numbers of each layer are different, and the materials of the wire mesh in at least two layers are different.

Preferably, the composition of the stainless steel includes the following components in terms of mass percentage: C: 0.01-0.08%, Cr: 15-25%, Al: 0-6.0%, Si: 0.2-1.2%, Ni: 0 ～11%, Mn: 0.4～0.8%, Mo: 0～3%, Iron: balance; the superalloy includes the following components in terms of mass percentage: C: 0.06～0.09%, Cr: 15～21% , Mo: 0-3%, W: 0-6%, Al: 0.1-2.2%, Ti: 0.1-2.5%, Fe: 1-5%, unavoidable impurities: less than 2%, nickel: balance. Containing chromium and other elements can ensure that the metal support plate has good corrosion resistance and mechanical properties at high temperatures, and at the same time ensure that the thermal expansion coefficient matches the electrolyte, cathode, and anode.

Preferably, the anode slurry contains NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT, and also includes yttrium oxide stabilized zirconia and One of Sr _2-x Ca _x Fe _1.5 Mo _0.5 O ₆ _-δ , where x=0, 0.1, 0.3, 0.5. Facilitate battery reaction.

Preferably, the electrolyte slurry includes butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG, glutamic acid PHT, and also includes yttria-stabilized zirconia, _LaGaO3- based electrolyte , Ba(Sr)Ce(Ln)O ₃ and CeO ₂ based solid electrolytes. The coefficient of thermal expansion of this electrolyte slurry is close to that of the anode and cathode, and the combination is better after sintering.

Preferably, the cathode slurry is Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ , LSM (La _1-x Sr _x Mn0 ₃ ), LSCF ((La, Sr)(Co, Fe)O ₃ ), pyrochlore-structured A ₂ Ru2O _7-x (A=Pb, Bi) ceramics, Ag-YDB composite ceramics and perovskite-structured L-type ceramics, where x=0, 0.1, 0.3, 0.5. This cathode material is tightly bonded to the electrolyte layer.

Compared with the prior art, the present invention has the advantages that: the metal support plate for the fuel cell adopts a folded or stacked multi-layer wire mesh as the metal support plate, and its surface is flat to ensure that the anode layer is evenly covered On the mesh metal support plate, the electrolyte layer and the cathode layer are also uniformly distributed, so that the final prepared metal support plate has high tensile strength, small deformation and easy to maintain the characteristics of the plate. Compared with support plates using metal plates, the density is lower and the weight is lighter, which is conducive to weight reduction. In addition, there is no need for adhesive and coating treatment, but the support plate made of metal plate needs to be subjected to multiple coating treatments, and the cost is high. In addition, the above preparation method has a simple process, can realize mass production of the metal support plate without a mold, reduces production cost, and improves production efficiency.

Description of drawings

Figure 1 is a cross-sectional view of the metal support plate fuel cell structure;

Fig. 2 is the pore morphology of the screen of step 1) in embodiment 1;

Fig. 3 is the topography of rolling surface after shearing in embodiment 1;

The morphology of cut section after shearing in Fig. 4 embodiment 1;

Fig. 5 is the topography of rolling surface after shearing in embodiment 2;

The morphology of the cut section after shearing in Fig. 6 embodiment 2;

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Example 1:

As shown in Fig. 2 to Fig. 4, it is the first preferred embodiment of the present invention.

The preparation method of the metal support plate for the fuel cell in this embodiment includes the following steps in sequence:

1) A wire mesh with a mesh number of 700 is used, as shown in Figure 2 for details. The material of the wire mesh is 304L austenitic stainless steel; in terms of mass percentage, the stainless steel includes the following components: C: 0.015%, Cr: 19.2%, Mn: 0.6%, Si: 0.8%, Ni: 10.3%, Iron: balance;

2) Folding the wire mesh in step 1) to obtain a multilayer wire mesh, the number of folded layers is 10 layers;

3) Roll the screen layer in step 2), then put it into a vacuum sintering furnace, sinter at a vacuum degree of 0.1Pa, a sintering temperature of 1300°C, and a sintering time of 60 minutes, and take out the multi-layer after sintering and cooling silk screen;

4) Cutting the sintered multi-layer screen into a metal substrate of 110mm×110mm×0.18mm;

5) The anode slurry is coated on the upper surface of the cut metal substrate, and then the uncoated lower surface of the metal substrate 4 is placed on the setter and dried, thereby forming the anode layer 2 on the upper surface of the metal substrate 4 ; The aforementioned anode slurry includes Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0), NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyethylene Diol PEG and glutamic acid PHT.

6) Coating the electrolyte slurry on the upper surface of the anode layer 2, then placing the uncoated lower surface of the metal substrate 4 on the setter, and drying, thereby forming an electrolyte coating on the upper surface of the anode layer 2. Layer 3: the aforementioned electrolyte slurry includes yttria-stabilized zirconia electrolyte, butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT.

7) Coating Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0) cathode slurry on the upper surface of the electrolyte coating, and then resting the uncoated lower surface of the metal substrate 4 on a support The plate was fired and dried to form the cathode layer 1 on the upper surface of the electrolytic coating, thereby producing a metal support plate.

Step 4) The appearance of the rolling surface after cutting is shown in FIG. 3 , and the sectioned appearance is shown in FIG. 4 . From this, it can be seen that the metal substrate 4 has a certain number of pores, the pores are uniform, and the gas flow rate is stable. The metal wires are distributed vertically and horizontally to ensure good strength.

The tensile strength of the sintered metal support plate of this embodiment is 150MPa, and the flatness of the support plate is 0.2mm, while the compressive strength of the metal support plate prepared by using the metal powder of the same material as in this embodiment is no more than 50MPa, and the flatness Above 0.5mm. Therefore, the tensile strength of the metal support plate prepared by using the above-mentioned multi-layer wire mesh is higher.

Example 2:

The difference between this embodiment and above-mentioned embodiment 1 is only:

The material of the wire mesh selected in step 1) is different, specifically, select 430L ferritic stainless steel wire mesh for use, and the mesh number of wire mesh is 700 orders; According to mass percentage, this stainless steel wire mesh includes the following components: comprising The following components: C: 0.010%, Cr: 17.4%, Mn: 0.8%, Si: 0.5%, Iron: the balance;

In step 2), the wire mesh is stacked. Stack the wire mesh 10 layers and place it on the corundum board. Then cover the stacked wire mesh with a corundum board of the same size. On the corundum board (ceramic board) No heavy objects placed;

Step 3) Put the above-mentioned ceramic plate and wire mesh together into a push boat type sintering furnace, and sinter at a sintering temperature of 1320°C and a sintering time of 40 minutes in high-purity hydrogen with a dew point lower than -40°C. After sintering and cooling, take out the multi-layer screen;

Step 4) Cutting: Cut the multi-layer screen in step 3) into a metal substrate of 110mm×110mm×0.45mm with a cutter;

The aforementioned anode slurry includes yttria-stabilized zirconia YSZ, NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT. The aforementioned electrolyte slurry includes yttria-stabilized zirconia electrolyte, butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT. The cathode material is Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0.5).

In this embodiment, the appearance of the rolled surface after cutting is shown in FIG. 5 , and the cut appearance is shown in FIG. 6 . It can be seen that the metal substrate has more pores, the pores are uniform, and the gas flow rate is stable. The metal wires are distributed vertically and horizontally to ensure good strength.

The tensile strength of the sintered metal support plate in this embodiment is 120 MPa, and the flatness of the support plate is 0.15 mm. The tensile strength of the metal support plate prepared by using the above-mentioned multi-layer wire mesh is higher.

Example 3:

The difference between this embodiment and the above-mentioned embodiment 2 is only that the material of the wire mesh selected in step 1) is different, specifically, FeCrAl heat-resistant steel wire mesh is selected, the mesh number of the wire mesh is 325 mesh, and the aforementioned heat-resistant steel wire Net, according to mass percentage, includes the following components: C: 0.08%, Cr: 18.7%, Al: 2.8%, Mn: 0.4%, Si: 1.1%, iron: the balance;

Step 2) The above-mentioned wire mesh is in the form of stacking. Stack the wire mesh 6 layers and place it on the corundum board, then cover the stacked wire mesh with the corundum board of the same size, and put it on the corundum board (ceramic board) Place a weight of 2kg;

Step 3) The sintering temperature is 1340° C., and the sintering time is 50 minutes;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.53mm.

The aforementioned anode slurry includes Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0.5), NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyethylene glycol Alcohol PEG and glutamic acid PHT. The aforementioned electrolyte slurry includes CeO ₂ -based solid electrolyte, butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT. The cathode material is Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0.3).

In this embodiment, the tensile strength of the metal support plate after sintering is 120MPa, and the flatness of the support plate is 0.18mm. However, the tensile strength of the same powder material used in this embodiment is not more than 50 MPa, and the flatness is above 0.4 mm. Therefore, the metal support plate prepared by using the above-mentioned multi-layer wire mesh has a higher tensile strength.

Example 4:

The difference between this embodiment and the above-mentioned embodiment 2 is that the material of the wire mesh selected in step 1) is different, specifically, FeCrAl heat-resistant steel wire mesh and 304L austenitic stainless steel wire mesh are selected. Among them, the mesh number of the FeCrAl heat-resistant steel wire mesh is 325 mesh, and the above-mentioned heat-resistant steel includes the following components in terms of mass percentage: C: 0.08%, Cr: 18.7%, Al: 2.8%, Mn: 0.4%, Si : 1.1%, iron: the balance; 304L austenitic stainless steel wire mesh, the mesh number of the wire mesh is 700 mesh, including the following components: C: 0.015%, Cr: 19.2%, Mn: 0.6%, Si: 0.8% , Ni: 10.3%, iron: balance;

Step 2) Stack the above-mentioned FeCrAl and 304L screens alternately, with 5 layers of screens of each material, and place them on the corundum board, then cover the stacked screens with a corundum board of the same size, place 4kg on the corundum board heavy objects;

Step 3) The sintering temperature is 1320° C., and the sintering time is 50 minutes;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.64mm.

The aforementioned anode slurry includes Sr _2-x Ca _x Fe _1.5 Mo _0.5 O _6-δ (x=0.3), NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyethylene glycol Alcohol PEG and glutamic acid PHT. The aforementioned electrolyte slurry includes Ba(Sr)Ce(Ln)O ₃ electrolyte, butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG and glutamic acid PHT.

The metal support plate prepared in this embodiment has uniform pores, small deformation and high tensile strength.

Example 5:

The difference between this embodiment and the above-mentioned embodiment 2 is only that: the material of the wire mesh selected in step 1) is different, specifically, select the superalloy (GH 3030) wire mesh for use, and the mesh number of the wire mesh is 200 orders, the aforementioned The high-temperature alloy includes the following components in terms of mass percentage: C: 0.09%, Cr: 20.7%, Al: 0.13%, Ti: 0.2%, Fe: 1.1%, nickel: the balance;

Step 2) stack 6 layers of the above-mentioned wire mesh, put it into a rolling mill and roll it to a thickness of 0.63mm;

Step 3) Put the rolled plate into a vacuum sintering furnace, sinter at a vacuum degree of 0.05Pa, a sintering temperature of 1310°C, and a sintering time of 30 minutes, and take out the screen after sintering and cooling;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.63mm.

Embodiment 6:

The difference between this embodiment and the above-mentioned embodiment 2 is only that the material of the wire mesh selected in step 1) is different, specifically, a superalloy (GH4037) wire mesh is selected, and the mesh number of the wire mesh is 400 mesh. In terms of mass percentage, the alloy includes the following components: C: 0.06%, Cr: 15.4%, Mo: 2.95%, W: 5.90%, Al: 2.04%, Ti: 2.2%, Fe: 4.3%, unavoidable impurities : less than 2%, nickel: balance;

Step 2) stack 8 layers of the above-mentioned wire mesh, put it into a rolling mill and roll it to a thickness of 0.51mm;

Step 3) Put the rolled plate into a vacuum sintering furnace, sinter at a vacuum degree of 0.05Pa, a sintering temperature of 1290°C, and a sintering time of 90 minutes, and take out the screen after sintering and cooling;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.51mm.

Embodiment 7:

The difference between this embodiment and the above-mentioned embodiment 2 is that the material of the wire mesh selected in step 1) is different, specifically, a superalloy (GH4037) wire mesh and a 434L ferritic stainless steel wire mesh are selected. Among them, the mesh number of GH4037 wire mesh is 400 mesh, and the above-mentioned superalloy includes the following components in terms of mass percentage: C: 0.06%, Cr: 15.4%, Mo: 2.95%, W: 5.90%, Al: 2.04%, Ti: 2.2%, Fe: 4.3%, unavoidable impurities: less than 2%, nickel: balance; 434L ferritic stainless steel wire mesh, the mesh number of ferritic stainless steel wire mesh is 600 mesh, the aforementioned ferritic stainless steel In terms of mass percentage, it includes the following components: C: 0.010%, Cr: 17.4%, Mn: 0.8%, Si: 0.5%, iron: the balance;

Step 2) 10 layers of the above two kinds of wire meshes are respectively stacked, in the form of alternately stacked, put into a rolling mill and rolled to a thickness of 0.95 mm;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.95mm.

Embodiment 8:

The difference between this embodiment and the above-mentioned embodiment 2 is that the material of the wire mesh selected in step 1) is different, specifically, a superalloy (GH4037) wire mesh and a 434L ferritic stainless steel wire mesh are selected. Among them, the mesh number of the superalloy (GH4037) wire mesh is 400 mesh, and the superalloy (GH4037) wire mesh includes the following components in terms of mass percentage: C: 0.06%, Cr: 15.4%, Mo: 2.95%, W: 5.90%, Al: 2.04%, Ti: 2.2%, Fe: 4.3%, unavoidable impurities: less than 2%, nickel: balance; 434L ferritic stainless steel wire mesh, the mesh number of the wire mesh is 600 mesh, including The following components: C: 0.010%, Cr: 17.4%, Mn: 0.8%, Si: 0.5%, iron: the balance; FeCrAl heat-resistant steel wire mesh, the mesh of the wire mesh is 325 mesh, 434L ferritic stainless steel according to In terms of mass percentage, it includes the following components: C: 0.08%, Cr: 18.7%, Al: 2.8%, Mn: 0.4%, Si: 1.1%, iron: the balance;

Step 2) The above-mentioned three kinds of wire meshes are stacked with 5 layers respectively, in the form of alternately stacked, put into a rolling mill and rolled to a thickness of 0.85mm;

Step 4) The size of the metal substrate obtained after cutting is 110mm×110mm×0.85mm.

Embodiment 9:

The difference between this embodiment and the above-mentioned embodiment 2 is only that: the material of the wire mesh selected in step 1) is different, specifically, the material of the wire mesh is 304L austenitic stainless steel and superalloy (GH4037) wire mesh; Among them, 304L austenitic stainless steel, in terms of mass percentage, the stainless steel includes the following components: C: 0.01%, Cr: 17%, Mn: 0.6%, Si: 0.2%, Ni: 11%, iron: the balance;

Superalloy (GH4037) wire mesh includes the following components in terms of mass percentage: C: 0.07%, Cr: 21%, Mo: 3%, W: 6%, Al: 2.2%, Ti: 2.5%, Fe: 5 %, unavoidable impurities: less than 2%, nickel: the balance.

The sintering temperature in step 3) is 1350° C., and the sintering holding time is 5 minutes.

In step 5), step 6) and step 7), sintering is carried out after drying, the sintering temperature adopted in the sintering in step 5) and the sintering in step 6) are all 1050° C., and the sintering time is 10 min. The sintering temperature in 7) is 800° C., the sintering time is 5 minutes, and the vacuum degree is 10 ⁻³ Pa.

Example 10:

The difference between this embodiment and the above-mentioned embodiment 2 is only that: the material of the wire mesh selected in step 1) is different, specifically, the material of the wire mesh is 304L austenitic stainless steel and superalloy (GH4037) wire mesh; Among them, 304L austenitic stainless steel, according to the mass percentage, the stainless steel includes the following components: C: 0.07%, Cr: 20%, Mn: 0.5%, Si: 1.2%, Ni: 5%, iron: the balance;

Superalloy (GH4037) wire mesh includes the following components in terms of mass percentage: C: 0.08%, Cr: 15%, Mo: 2%, W: 3%, Al: 0.1%, Ti: 0.1%, Fe: 1 %, unavoidable impurities: less than 2%, nickel: the balance.

The sintering temperature in step 3) is 1000°C, and the sintering holding time is 500min.

In step 5), step 6) and step 7), sintering is carried out after drying, the sintering temperature adopted in the sintering in step 5) and the sintering in step 6) are all 1400° C., and the sintering time is 300 min. The sintering temperature in 7) is 1200° C., the sintering time is 300 min, and the vacuum degree is 10 ² Pa.

Example 11:

The difference between this embodiment and the above-mentioned embodiment 2 is only: in step 5), step 6) and step 7) all carry out sintering after drying, the sintering in step 5) and the sintering in step 6) adopt the sintering The temperature is 1200° C., and the sintering time is 50 minutes. The sintering temperature used in step 7) is 900° C., the sintering time is 60 minutes, and the vacuum degree is 10 ² Pa.

Claims

A method for preparing a metal support plate for a fuel cell, characterized in that it includes the following steps in sequence:

1) The wire mesh with a mesh number of 40 to 2000 meshes is used, and the wire mesh is made of stainless steel and/or superalloy;

2) According to the thickness of the target metal support plate, the wire mesh in step 1) is folded or stacked to obtain a multi-layer wire mesh, and the number of folded or stacked layers is 2 to 100 layers;

3) rolling or pressing the screen layer in step 2), and then sintering;

4) cutting the sintered multi-layer screen to obtain a metal substrate;

5) coating the anode slurry on the upper surface of the trimmed metal substrate, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming an anode layer on the upper surface of the metal substrate;

6) coating the electrolyte slurry on the upper surface of the anode layer, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming an electrolyte coating on the upper surface of the anode layer;

7) coating the cathode slurry on the upper surface of the electrolyte coating, then placing the uncoated lower surface of the metal substrate on the setter and drying, thereby forming a cathode layer on the upper surface of the electrolyte coating, A metal support plate is thus produced.
The preparation method according to claim 1, characterized in that: the sintering temperature in step 3) is 1000°C-1350°C, and the sintering holding time is 5-500min.
The preparation method according to claim 1, characterized in that: the pressing in step 3) adopts: placing a support plate under the multilayer wire mesh, placing a ceramic pressing plate above the multilayer silk mesh, and placing a heavy weight on the top of the ceramic pressing plate. Objects, the support plate is a ceramic support plate or graphite support plate, and the heavy object is heat-resistant steel or tungsten alloy.
The preparation method according to claim 3, characterized in that: during sintering, the multi-layer wire mesh, support plate, ceramic pressing plate and weights are put together into a sintering furnace for sintering.
The preparation method according to claim 1, characterized in that: the wire mesh is austenitic, or ferritic stainless steel, or heat-resistant stainless steel; the superalloy is GH3030 or GH4037.
The preparation method according to claim 1, characterized in that: in step 5), step 6) and step 7) all carry out sintering after drying, the sintering in step 5) and the sintering in step 6) adopt The sintering temperature is 1050°C-1400°C, the sintering time is 10-300min, the sintering temperature used in step 7) is 800°C-1200°C, the sintering time is 5-300min, and the vacuum degree is 10 -3 Pa ~10 2 Pa.
The preparation method according to claim 1, characterized in that: in the stacked multi-layer wire mesh, the meshes of each layer are different, and the materials of the wire mesh in at least two layers are different.
[Corrected 25.01.2022 under Rule 91]
The preparation method according to claim 1, characterized in that: the components of the stainless steel include the following components in terms of mass percentage: C: 0.01-0.08%, Cr: 15-25%, Al: 0-6.0% , Si: 0.2-1.2%, Ni: 0-11%, Mn: 0.4-0.8%, Mo: 0-3%, iron: the balance; the superalloy includes the following components in terms of mass percentage: C: 0.06～0.09%, Cr: 15～21%, Mo: 0～3%, W: 0～6%, Al: 0.1～2.2%, Ti: 0.1～2.5%, Fe: 1～5%, unavoidable Impurities: less than 2%, nickel: balance.
According to the preparation method according to any one of claims 1 to 8, it is characterized in that: the anode slurry contains NiO, butanone, ethanol, triethanolamine, starch, polyvinyl butyral PVB, polyvinyl butyral Ethylene glycol PEG and glutamic acid PHT also include one of yttria-stabilized zirconia and Sr 2-x Ca x Fe 1.5 Mo 0.5 O 6-δ , where x=0, 0.1, 0.3, 0.5.
The preparation method according to claim 9, characterized in that: the electrolyte slurry includes butanone, ethanol, triethanolamine, polyvinyl butyral PVB, polyethylene glycol PEG, glutamic acid PHT, and There is one of yttria stabilized zirconia, LaGaO 3 based electrolyte, Ba(Sr)Ce(Ln)O 3 and CeO 2 based solid electrolyte.