Manufacturing method of metal supporting plate for fuel cell

Abstract

The invention relates to a manufacturing method of a metal supporting plate for a fuel cell. The manufacturing method sequentially comprises the following steps: 1) adopting one of sintered stainless steel, heat-resistant steel, nickel-based alloy, cobalt-based alloy, titanium alloy and chromium-based alloy; 2) screening the powder in the step 1), wherein the particle size of the selected powder is 13-250 microns; 3) placing the powder in an inner hole of a measuring vessel, removing a redundant powder, and placing the measuring vessel on a load bearing plate; 4) sintering the load bearing plate on which the measuring vessel is placed; 5) coating an anode slurry on the upper surface of a metal substrate so as to form an anode layer on the upper surface of the metal substrate; 6) coating an electrolyte slurry on the upper surface of the anode layer to form an electrolyte coating on the surface of the anode layer; and 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 so as to produce a metal support plate. Sintering deformation is eliminated, and the combination tightness between the anode layer and the metal substrate is improved.

Description

technical field [0001] The invention belongs to the technical field of fuel cells, and in particular relates to a method for manufacturing a metal support plate used in fuel cells. Background technique [0002] Solid oxide fuel cell is an ideal fuel cell, which not only has the advantages of high efficiency and environmental friendliness of fuel cell, but also has the following outstanding advantages: [0003] (1) The solid oxide fuel cell is an all-solid structure, and there are no corrosion problems and electrolyte loss problems caused by the use of liquid electrolytes, and it is 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 ...

AI Technical Summary

Problems solved by technology

Due to the thin metal support layer, the thickness of the metal support plate is prone to unevenness after dry pressing, resulting in inconsistent sintering deformation and affecting the bonding between the anode, electrolyte, etc. , affecting the combination with the anode etc.

[0007] Fe-based alloys and Ni-based alloys are used as MS-SOFC metal supports. Due to the large difference between the thermal expansion coefficient of Ni-based alloys and the electrolyte material, during the operation of the battery, the internal thermal stress is too large, and cracks are prone to occur, and even the electrolyte layer peels off. ; The pure Ni support body has poor oxidation resistance, and is easy to agglomerate and coarsen, which makes the SOFC performance decline sharply

These shortcomings of Ni-based alloys seriously hinder its application in SOFC supports; Fe-based alloys are used as supports, especially ferritic stainless steel, although the high-temperature thermal expansion coefficient CTE of ferritic stainless steel (11×10 -6 ~13×10 -6 K -1 ) with YSZ (yttria stabilized zirconia) and GDC (Gd 2 o 3 Doped CeO 2 )(13×10 -6 ~14×10 -6 K -1 ) The electrolyte is very close, but long-term work in a medium-high temperature and humid atmosphere can easily lead to the oxidation of metal materials and the interdiffusion of elements between Fe and Cr elements in the stainless steel support and Ni-based anodes

During the preparation or operation of MS-SOFC, the Fe and Cr elements in the support diffuse into the anode, forming oxides during the operation of the battery, resulting in rapid degradation of battery performance; at the same time, the Ni element in the anode diffuses into the stainless steel support In the middle, the thermal expansion coefficient of the support changes, the internal stress of the battery increases, and the structural stability decreases.

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