A kind of sealing method of powder metallurgy chromium alloy fuel cell connector

A fuel cell and powder metallurgy technology, which is used in fuel cell parts, fuel cells, electrical components, etc., can solve the problem of inability to isolate oxidizing gas and fuel gas, the conductivity of the sealing hole needs to be improved, and the airtightness of the connection cannot be guaranteed. It can achieve the effect of good application prospect, simple sealing method and convenient operation.

Active Publication Date: 2022-08-05
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, porosity is an inherent feature of powder metallurgy products. Due to the existence of pores, the airtightness of the connecting parts cannot be guaranteed, and the oxidizing gas and fuel gas cannot be isolated. Therefore, it is necessary to seal the holes of the powder metallurgy connecting parts to obtain good airtightness. While ensuring the electrical conductivity of the connector
The working temperature of the connectors is 800-1000°C, which leads to the impregnation of powder metallurgy products with resin or inorganic sodium silicate and other sealing agents, which cannot be applied to battery connectors.
[0005] For example, the Chinese invention patent "A Method for Sealing Holes of Powder Metallurgy Chromium Alloy Fuel Cell Connectors" previously applied by the applicant, the patent number is ZL201410554424.2, and the authorized announcement number is CN 105562698B, which discloses a powder metallurgy chromium alloy The hole sealing method of alloy fuel cell connectors uses carburizing atmosphere to oxidize and carbonize the chromium-based connecting plate to seal the holes, but it needs to be treated at a high temperature above 800 degrees Celsius for 1 to 8 hours, which increases the cost and seals the holes. Conductivity needs to be improved

Method used

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  • A kind of sealing method of powder metallurgy chromium alloy fuel cell connector
  • A kind of sealing method of powder metallurgy chromium alloy fuel cell connector
  • A kind of sealing method of powder metallurgy chromium alloy fuel cell connector

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Embodiment 1

[0029] like Figure 1 to Figure 3 shown, is the first preferred embodiment of the present invention.

[0030] The sealing method of the powder metallurgy chromium alloy fuel cell connector of this embodiment includes the following steps in sequence:

[0031] 1) Prepare a suspension containing conductive particles: Dispose chromium powder suspended particles with an average particle size of 5 μm and a volume concentration of 1 vol% into water glass, and add aluminum tripolyphosphate with a volume concentration of 10% to the water glass and stir A suspension is uniformly obtained. The suspension is a pore sealing agent 1 in which chromium powder is suspended in water glass. The chromium powder is conductive and is not easily oxidized. The particle size of the suspended matter is less than 10 μm. The volume concentration of the suspended particles in the suspension is 10vol %;

[0032] 2) Place the connector to be sealed in a prepared suspension of 1 vol% chrome powder water gl...

Embodiment 2

[0039] The method for sealing holes of a powder metallurgy chrome alloy fuel cell connector in this embodiment includes the following steps in sequence:

[0040] 1) Configure a suspension containing conductive particles: configure the suspended particles of chromium powder with a volume concentration of 3 vol% into water glass, and add aluminum tripolyphosphate with a volume concentration of 0.5 vol% to the water glass and stir to obtain a suspension. , the suspension is a pore sealing agent in which chromium powder is suspended in water glass, the chromium powder is conductive and is not easily oxidized particles, the particle size of the suspended matter is less than 10 μm, and the volume concentration of the suspended particles in the suspension is 0.5vol%;

[0041] 2) Place the connector to be sealed in the prepared 3vol% chrome powder water glass suspension, then place the suspension with the connector in a vacuum with a pressure of 10000Pa and let stand for 60min at room ...

Embodiment 3

[0046] The method for sealing holes of a powder metallurgy chrome alloy fuel cell connector in this embodiment includes the following steps in sequence:

[0047] 1) Configure a suspension containing conductive particles: configure 1.5vol% of 434 stainless steel powder suspended particles into water glass, and add 0.5vol% of calcium tripolyphosphate to the water glass and stir to obtain a suspension. It is a pore sealing agent for 434 stainless steel powder suspended in water glass. 434 stainless steel powder is conductive and is not easy to be oxidized. The particle size of the suspended matter is less than 10μm, and the volume concentration of the suspended particles in the suspension is 7vol%;

[0048] 2) The connector to be sealed is placed in a prepared suspension of 1.5vol% 434 stainless steel powder water glass, and then the suspension with the connector is placed in a vacuum with a pressure of 40000Pa and kept at room temperature. Set for 60min, at this time the connect...

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Abstract

The invention relates to a method for sealing a connecting piece of powder metallurgy chromium alloy fuel cell. And cleaning—the cleaned connector is cured, the sealing method of the present invention is simple, and the operation is convenient; through dipping, cleaning and curing, the pores of the connector can be sealed, the air tightness of the connector is improved, and the reduction of In addition, because the filler in the pores contains a certain amount of conductive particles, the pores have a certain conductivity without changing the performance of the matrix, so the air tightness and conductivity of the connector are effectively improved, Has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of energy production, and in particular relates to a method for sealing holes of a powder metallurgy chrome alloy fuel cell connector of a solid oxide fuel cell stack. Background technique [0002] The working principle of solid oxide fuel cells is that fuel gas, such as hydrogen (H2), methane (CH4), city gas, etc., is continuously fed into the anode side. The catalytic anode surface adsorbs fuel gas and passes through the porous structure of the anode. Diffusion to the interface between the anode and the electrolyte; oxygen or air is continuously introduced on the cathode side, and the surface of the cathode with a porous structure adsorbs oxygen. Due to the catalytic effect of the cathode itself, O2 gets electrons and becomes O2-, under the action of chemical potential , O2- enters the solid oxygen ion conductor that acts as an electrolyte, diffuses due to the concentration gradient, and finally reaches th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/24B22F3/26H01M8/0208H01M8/0223
CPCB22F3/24B22F3/26H01M8/0223H01M8/0208Y02E60/50
Inventor 包崇玺张辰秦晓冬
Owner NBTM NEW MATERIALS GRP
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