CN111633211B - Hole sealing method for powder metallurgy chromium alloy fuel cell connecting piece - Google Patents

Hole sealing method for powder metallurgy chromium alloy fuel cell connecting piece Download PDF

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CN111633211B
CN111633211B CN202010430053.2A CN202010430053A CN111633211B CN 111633211 B CN111633211 B CN 111633211B CN 202010430053 A CN202010430053 A CN 202010430053A CN 111633211 B CN111633211 B CN 111633211B
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connecting piece
powder
suspension
particles
sealing method
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CN111633211A (en
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包崇玺
张辰
秦晓冬
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Mbtm New Materials Group Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0206—Metals or alloys
    • H01M8/0208—Alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/02—Details
    • H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
    • H01M8/0204—Non-porous and characterised by the material
    • H01M8/0223—Composites
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Fuel Cell (AREA)

Abstract

The invention relates to a hole sealing method of a powder metallurgy chromium alloy fuel cell connecting piece, which is characterized in that the hole sealing method is simple and convenient to operate by preparing suspension containing conductive particles, placing the connecting piece in the suspension and standing the connecting piece at the room temperature in a vacuum chamber, taking out and cleaning the soaked connecting piece and solidifying the cleaned connecting piece; the pores of the connecting piece can be sealed through dipping, cleaning and curing, so that the air tightness of the connecting piece is improved, and the cost is reduced; in addition, as the filler in the pores contains a certain amount of conductive particles, the pore parts have certain conductivity without changing the performance of the matrix, thus effectively improving the air tightness and conductivity of the connecting piece and having good application prospect.

Description

Hole sealing method for powder metallurgy chromium alloy fuel cell connecting piece
Technical Field
The invention belongs to the technical field of energy production, and particularly relates to a hole sealing method for a powder metallurgy chromium alloy fuel cell connecting piece of a solid oxide fuel cell stack.
Background
The operating principle of the solid oxide fuel cell is that fuel gas is continuously introduced into the anode side, for example: hydrogen (H2), methane (CH4), city gas and the like, and the fuel gas is adsorbed on the surface of the anode with the catalytic action and is diffused to the interface of the anode and the electrolyte through the porous structure of the anode; oxygen or air is continuously introduced to one side of the cathode, oxygen is adsorbed on the surface of the cathode with a porous structure, O2 obtains electrons to become O2-due to the catalytic action of the cathode, O2 enters a solid oxygen ion conductor which plays a role of an electrolyte under the action of chemical potential, the electrons finally reach the interface of the solid electrolyte and the anode due to diffusion caused by concentration gradient, the solid oxygen ion conductor reacts with fuel gas to generate water, and the lost electrons return to the cathode through an external circuit, so that current is generated.
When the solid oxide fuel cell is used for generating electricity, a new material which can resist high-temperature oxidation, has good electric and thermal conductivity and thermal expansion characteristics matched with electrode ceramic and can stably work for a long time is needed to be used as a connecting piece for connecting a single cell into a high-power electric pile. The cell connecting piece is used as a main component of the cell stack to play a role in isolating oxidizing gas and fuel gas between different solid oxide fuel cells, and is also used as an electric connector of a single solid oxide fuel cell to guide current generated by electrochemical reaction out.
Research has found that chromium-based alloy materials can meet the requirements of connectors of fuel cells. Because the battery connector usually has a complex surface shape, and the chromium has a high melting point (about 1900 ℃), high activity and easy brittle fracture, the traditional method (fusion casting and machining) is difficult to prepare and has high cost. In recent years, due to the development of refining and powder metallurgy processing technology, the chromium-based connecting plate can be used for obtaining a connecting piece with a complex surface type by one-step forming-sintering by adopting a powder metallurgy method. However, the pores are inherent characteristics of the powder metallurgy product, and due to the existence of the pores, the air tightness of the connecting piece cannot be ensured, and the oxidizing gas and the fuel gas cannot be isolated, so that the hole sealing treatment needs to be carried out on the powder metallurgy connecting piece, the good air tightness is obtained, and the electric conductivity of the connecting body is ensured. The working temperature of the connecting piece is 800-1000 ℃, so that the common method for sealing holes by using hole sealing agents such as powder metallurgy products impregnated with resin or inorganic sodium silicate and the like cannot be applied to the battery connecting piece.
For example, the Chinese invention patent of ZL201410554424.2 and CN 105562698B in patent number of Chinese invention patent of the applicant's prior application discloses a hole sealing method of a powder metallurgy chromium alloy fuel cell connecting piece, which is used for sealing a chromium-based connecting plate through oxidation-carbonization heat treatment in carburizing atmosphere, but needs high temperature treatment at the temperature of more than 800 ℃ for 1-8 h, so that the cost is increased, and the conductivity of the hole sealing part needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for sealing a powder metallurgy chromium alloy fuel cell connecting piece, which has low cost, increases the air tightness of the connecting piece and simultaneously increases the conductivity, aiming at the current situation of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a hole sealing method for a powder metallurgy chromium alloy fuel cell connecting piece is characterized by sequentially comprising the following steps:
1) preparing a suspension containing conductive particles: preparing suspended particles into an inorganic solvent to obtain a suspension, wherein the suspended particles are conductive and difficult to oxidize;
2) placing a connecting piece to be sealed in the prepared suspension, and then placing the suspension in which the connecting piece is placed in vacuum and standing at room temperature;
3) taking out the soaked connecting piece and cleaning the surface of the connecting piece by water;
4) and (3) preserving the heat of the cleaned connecting piece for 2-200 minutes at 200-400 ℃ for curing treatment.
One of the preferred ways to suspend the particles: the suspended particles in the step 1) are metal particles, and the metal particles comprise one of chromium powder, nickel powder, stainless steel powder, iron powder, cobalt powder, molybdenum powder and tungsten powder.
The second preferred mode of suspending particles: the suspended particles in step 1) are metal oxide particles comprising Cr 2 O 3 And Al 2 O 3 One of them.
The third preferred mode of suspending particles: the suspended particles in step 1) are carbide particles, and the carbide particles comprise one of SiC powder and BC powder.
Four preferred modes of suspending the particles: the suspended particles in step 1) are boride particles comprising CrB 2 Powder and TiB 2 One of the powders.
Preferably, the suspended particles have a particle size of less than 10 μm and the volume concentration of suspended particles in the suspension is 0.5 to 15 vol%.
In order to enable the connecting piece to be soaked, in the step 2), standing for 2-200 minutes at room temperature under vacuum.
Preferably, the inorganic solvent in step 1) comprises water glass.
In order to increase the thermal stability, aluminum tripolyphosphate or calcium tripolyphosphate with the volume concentration of 0.5-10 vol% can be added into the inorganic solvent. The solidified sealant is likely to be pulverized after long-term use, the sealing performance is lost, and aluminum tripolyphosphate or calcium tripolyphosphate with the volume concentration of 0.5-10 vol% is added, so that the connecting piece still keeps a low-temperature form during long-term use at high temperature, is not easy to be pulverized, and keeps better sealing performance.
Preferably, the relative density of the connector is less than 85%. The density is low, and the intercommunication hole is many, and suspension easily gets into the hole inside, and the hole sealing effect is more obvious.
In order to improve the compactness of the connecting piece, after the step 4), the steps 2) to 4) are repeated
Compared with the prior art, the invention has the advantages that: the hole sealing method is simple and convenient to operate; the pores of the connecting piece can be sealed through dipping, cleaning and curing, so that the air tightness of the connecting piece is improved, and the cost is reduced; in addition, as the filler in the pores contains a certain amount of conductive particles, the pore parts have certain conductivity without changing the performance of the matrix, thus effectively improving the air tightness and conductivity of the connecting piece and having good application prospect.
Drawings
FIG. 1 is a diagram illustrating the pore morphology of the edge portion after sealing according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the pore morphology of the middle portion after sealing the pores according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating distribution of elements after hole sealing according to an embodiment of the present invention;
FIG. 4 shows the morphology of the fracture after sealing.
Detailed Description
The invention is described in further detail below with reference to the following examples of the drawings.
The first embodiment is as follows:
as shown in fig. 1 to 3, a first preferred embodiment of the present invention is shown.
The hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece of the embodiment sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: preparing chromium powder suspended particles with the average particle size of 5 mu m and the volume concentration of 1 vol% into water glass, adding aluminum tripolyphosphate with the volume concentration of 10% into the water glass, and then uniformly stirring to obtain a suspension, wherein the suspension is a hole sealing agent 1 with the chromium powder suspended in the water glass, the chromium powder is conductive particles which are not easily oxidized, the particle size of the suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 10 vol%;
2) placing a connecting piece to be sealed in a prepared suspension of 1 vol% chromium powder water glass, then placing the suspension with the connecting piece in a vacuum with the pressure of 5000Pa, and standing at room temperature for 20min, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate at 250 ℃ for 40 minutes for curing treatment.
Fig. 1 and 2 are respectively a surface and internal pore morphology diagram of a connection plate after being sealed, and as can be seen from fig. 1 and 2, the interior of the pores is filled with a sealing agent 1; as can be seen from fig. 3, the silicon element 2 is distributed in the pores in a concentrated manner, so that the pores can be filled with the sealant 1; the conductivity and the air tightness of the connecting plate after the sealing holes are fully improved.
Fig. 4 shows the appearance of the fracture of the connection plate after sealing, and it can be clearly seen that the particles 3 of the complete metal Cr are stored in the cured sealing agent.
In addition, the conductive suspension particles may be metal particles including one of nickel powder, stainless steel powder, iron powder, cobalt powder, molybdenum powder, and tungsten powder, or may include Cr 2 O 3 And Al 2 O 3 The metal oxide particles of one of (1) may also be carbide particles including one of SiC powder and BC powder; may also be CrB 2 Powder and TiB 2 Boride particles of one of the powders.
The second embodiment:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: preparing chromium powder suspended particles with the volume concentration of 3 vol% into water glass, adding aluminum tripolyphosphate with the volume concentration of 0.5 vol% into the water glass, and uniformly stirring to obtain a suspension, wherein the suspension is a hole sealing agent with the chromium powder suspended in the water glass, the chromium powder is conductive particles which are not easily oxidized, the particle size of the suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 0.5 vol%;
2) placing a connecting piece to be sealed in a prepared suspension of 3 vol% chromium powder water glass, then placing the suspension with the connecting piece in a vacuum with the pressure of 10000Pa, and standing at room temperature for 60min, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate at 300 ℃ for 70 minutes for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example three:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: 1.5 vol% of 434 stainless steel powder suspended particles are prepared into water glass, 0.5 vol% of calcium tripolyphosphate is added into the water glass, the mixture is stirred uniformly to obtain a suspension, the suspension is a hole sealing agent with the 434 stainless steel powder suspended in the water glass, the 434 stainless steel powder is conductive particles which are not easy to oxidize, the particle size of the suspended particles is less than 10 micrometers, and the volume concentration of the suspended particles in the suspension is 7 vol%;
2) placing a connecting piece to be sealed in a prepared suspension of 434.5 vol% stainless steel powder water glass, and then placing the suspension with the connecting piece in a vacuum with the pressure of 40000Pa and standing at room temperature for 60min, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate at 300 ℃ for 70 minutes for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example four:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: 3 vol% of 410 stainless steel powder suspended particles are prepared into water glass, 5 vol% of aluminum tripolyphosphate is added into the water glass and then the mixture is stirred uniformly to obtain suspension, the suspension is a hole sealing agent with 410 stainless steel powder suspended in the water glass, the 410 stainless steel powder is conductive particles which are not easy to oxidize, the particle size of the suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 10 vol%;
2) placing a connecting piece to be sealed in a prepared suspension of 3 vol% 410 stainless steel powder water glass, then placing the suspension with the connecting piece in a vacuum with the pressure of 60000Pa, and standing at room temperature for 20min, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate at 210 ℃ for 50 minutes for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example five:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: chromium oxide (Cr) with a volume concentration of 5 vol% 2 O 3 ) Preparing powder suspension particles into water glass, adding calcium tripolyphosphate with volume concentration of 5 vol% into the water glass, and uniformly stirring to obtain suspension, wherein the suspension is Cr 2 O 3 Sealing agent with powder suspended in water glass, Cr 2 O 3 The powder is conductive particles which are not easy to be oxidized, the particle size of suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 0.5 vol%;
2) placing a connecting piece to be sealed in the prepared 5 vol% Cr 2 O 3 Putting the suspension with the connecting piece in a suspension of powdered water glass in a vacuum with the pressure of 70000Pa, and standing for 100min at room temperature, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate for 90 minutes at 350 ℃ for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example six:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: preparing silicon carbide (SiC) powder suspended particles with the volume concentration of 7 vol% into water glass, adding calcium tripolyphosphate with the volume concentration of 10 vol% into the water glass, and then uniformly stirring to obtain a suspension, wherein the suspension is a hole sealing agent with the SiC powder suspended in the water glass, the SiC powder is conductive particles which are not easily oxidized, the particle size of the suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 5 vol%;
2) placing a connecting piece to be sealed in a prepared suspension of 7 vol% of SiC powdered water glass, then placing the suspension with the connecting piece in a vacuum with the pressure of 30000Pa, and standing for 40min at room temperature, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate for 10 minutes at 400 ℃ for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example seven:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: 2 vol% of boron chromide (CrB) 2 ) Preparing powder suspended particles into water glass, adding calcium tripolyphosphate with the volume concentration of 2 vol% into the water glass, and uniformly stirring to obtain a suspension which is CrB 2 Sealing agent with powder suspended in water glass, CrB 2 The powder is conductive particles which are not easy to be oxidized, the particle size of suspended particles is less than 10 mu m, and the volume concentration of the suspended particles in the suspension is 10 vol%;
2) placing a connecting piece to be sealed in the prepared 2 vol% CrB 2 Putting the suspension with the connecting piece in a suspension of powdered water glass in a vacuum with the pressure of 3000Pa, and standing for 30min at room temperature, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate for 40 minutes at 220 ℃ for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example eight:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: 0.5 vol% of Al 2 O 3 The powder suspended particles are prepared into water glass and evenly stirred to obtain suspension, and the suspension is Al 2 O 3 Sealing agent with powder suspended in water glass, CrB 2 The powder is conductive particles which are not easy to be oxidized;
2) placing the connecting piece to be sealed in the prepared 0.5 vol% Al 2 O 3 Putting the suspension with the connecting piece in a suspension of powdered water glass in a vacuum with the pressure of 3000Pa, and standing for 30min at room temperature, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate for 2 minutes at 200 ℃ for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example nine:
the hole sealing method for the powder metallurgy chromium alloy fuel cell connecting piece sequentially comprises the following steps of:
1) preparing a suspension containing conductive particles: mixing 15 vol% of TiB 2 The powder suspended particles are prepared into water glass and evenly stirred to obtain suspension which is TiB 2 Sealing agents, TiB, in which the powder is suspended in water glass 2 The powder is conductive particles which are not easy to be oxidized;
2) placing the connecting piece to be sealed in the prepared TiB with the volume percent of 15 2 Putting the suspension with the connecting piece in a suspension of powdered water glass in a vacuum with the pressure of 3000Pa, and standing for 30min at room temperature, wherein the connecting piece is soaked by the suspension; the connecting piece is a connecting plate;
3) taking out the soaked connecting plate and washing the water glass suspension on the surface of the connecting plate by water;
4) and (4) preserving the heat of the cleaned connecting plate at 220 ℃ for 200 minutes for curing treatment.
In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example ten:
the present embodiment is different from the first embodiment only in that: the suspension uses iron powder to suspend particles. In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example eleven:
the present embodiment is different from the first embodiment only in that: the suspension uses cobalt powder to suspend particles. In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example twelve:
the present embodiment is different from the first embodiment only in that: the suspension adopts molybdenum powder to suspend particles. In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example thirteen:
the present embodiment is different from the first embodiment only in that: the suspension adopts tungsten powder to suspend particles. In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.
Example fourteen:
the present embodiment is different from the first embodiment only in that: suspension the particles were suspended using BC powder. In the embodiment, the holes of the sealed connecting plate are filled with the sealing agent, so that the conductivity and the air tightness of the sealed connecting plate are fully improved.

Claims (9)

1. A hole sealing method for a powder metallurgy chromium alloy fuel cell connecting piece is characterized by sequentially comprising the following steps:
1) preparing a suspension containing conductive particles: preparing suspended particles into an inorganic solvent to obtain a suspension, wherein the suspended particles are conductive and difficult to oxidize, and the inorganic solvent is water glass;
2) placing a connecting piece to be sealed in the prepared suspension, and then placing the suspension in which the connecting piece is placed in vacuum and standing at room temperature;
3) taking out the soaked connecting piece and cleaning the surface of the connecting piece by water;
4) and (3) preserving the heat of the cleaned connecting piece for 2-200 minutes at 200-400 ℃ for curing treatment.
2. The pore sealing method according to claim 1, characterized in that: the suspended particles in the step 1) are metal particles, and the metal particles comprise one of chromium powder, nickel powder, stainless steel powder, iron powder, cobalt powder, molybdenum powder and tungsten powder.
3. The pore sealing method according to claim 1, characterized in that: the suspended particles in step 1) are metal oxide particles comprising Cr 2 O 3 And Al 2 O 3 One of them.
4. The pore sealing method according to claim 1, characterized in that: the suspended particles in step 1) are carbide particles, and the carbide particles comprise one of SiC powder and BC powder.
5. The pore sealing method according to claim 1, characterized in that: the suspended particles in step 1) are boride particles comprising CrB 2 Powder and TiB 2 One of the powders.
6. The pore sealing method according to claim 1, characterized in that: in the step 1), the particle size of the suspended particles is less than 10 μm, and the volume concentration of the suspended particles in the suspension is 0.5-15 vol%.
7. The pore sealing method according to claim 1, characterized in that: and adding the aluminum tripolyphosphate or the calcium tripolyphosphate with the volume concentration of 0.5-10 vol% into the inorganic solvent.
8. The pore sealing method according to claim 1, characterized in that: the relative density of the connecting piece to be sealed is less than 85%.
9. The pore sealing method according to claim 1, characterized in that: after the step 4), repeating the steps 2) to 4).
CN202010430053.2A 2020-05-20 2020-05-20 Hole sealing method for powder metallurgy chromium alloy fuel cell connecting piece Active CN111633211B (en)

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