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Composite coating layer on surface of bipolar plate of aluminum-matrix fuel cell, and preparation method thereof

A fuel cell and surface recombination technology, which is applied in battery electrodes, metal material coating processes, coatings, etc., can solve the problems of differences in the crystal arrangement of the titanium nitride film, affecting the corrosion resistance of the film, and high contact resistance. , to achieve the effect of stable process, improved electrical conductivity and reduced contact resistance

Inactive Publication Date: 2018-05-11
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, because the titanium nitride film prepared by sputtering has defects and differences in crystal form arrangement, resulting in high contact resistance, it is necessary to dope silver in the titanium nitride coating to improve its conductivity and reduce Contact resistance
Doping metallic silver can improve the conductivity of titanium nitride coating, but a small amount of silver will escape spontaneously, which will affect the corrosion resistance of the film layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select an aluminum alloy as the base material, and deposit a silver-doped titanium nitride coating on the surface of the aluminum alloy base material. The specific steps are as follows:

[0027] (1) Sample pretreatment: Ultrasonic cleaning the aluminum alloy substrate in deionized water and absolute ethanol respectively, and drying with hot air;

[0028] (2) Pre-preparation for coating deposition: send the cleaned aluminum alloy substrate into the vacuum chamber equipped with Ti target and Ag target, and the target base distance is constant; vacuumize to 5×10 -3 After Pa, plasma cleaning was performed for 20 min under the condition that the Ti target current was 0.2A and the sample bias voltage was -400V.

[0029] (3) Preparation of Ti primer layer: Ti target current 5A, sample bias -100V, pure Ti coating was deposited for 8 minutes under sputtering conditions, argon gas was continuously flowed during the deposition process, and the pressure in the vacuum chamber was en...

Embodiment 2

[0035] Select an aluminum alloy as the base material, and deposit a silver-doped titanium nitride coating on the aluminum alloy base material. The specific steps are as follows:

[0036] (1) Sample pretreatment: Ultrasonic cleaning the aluminum alloy substrate in deionized water and absolute ethanol respectively, and drying with hot air;

[0037] (2) Pre-preparation for coating deposition: send the cleaned aluminum alloy substrate into the vacuum chamber equipped with Ti target and Ag target, and the target base distance is constant; vacuumize to 5×10 -3 After Pa, plasma cleaning was performed for 20 min under the condition that the Ti target current was 0.2A and the sample bias voltage was -400V.

[0038] (3) Preparation of Ti primer layer: Deposit a pure Ti coating for 8 minutes under the conditions of Ti target current 0.2A gradually changing to 5A and sample bias voltage -100V. During the deposition process, argon gas is continuously passed to ensure that the pressure in t...

Embodiment 3

[0044] Select an aluminum alloy as the base material, and deposit a silver-doped titanium nitride coating on the aluminum alloy base material. The specific steps are as follows:

[0045] (1) Sample pretreatment: Ultrasonic cleaning the aluminum alloy substrate in deionized water and absolute ethanol respectively, and drying with hot air;

[0046] (2) Pre-preparation for coating deposition: send the cleaned aluminum alloy substrate into the vacuum chamber equipped with Ti target and Ag target, and the target base distance is constant; vacuumize to 5×10 -3 After Pa, plasma cleaning was performed for 20 min under the condition that the Ti target current was 0.2A and the sample bias voltage was -400V.

[0047] (3) Preparation of Ti primer layer: Deposit a pure Ti coating for 8 minutes under the conditions of Ti target current 0.2A gradually changing to 5A and sample bias voltage -100V. During the deposition process, argon gas is continuously passed to ensure that the pressure in t...

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Abstract

The invention discloses a preparation method for a composite coating layer on the surface of a bipolar plate of an aluminum-matrix fuel cell. The preparation method comprises the following steps: (1)carrying out plasma cleaning on a matrix under a vacuum condition; (2) depositing a pure Ti coating layer on the cleaned matrix through ion sputtering; (3) depositing a TiN transition layer on the pure Ti coating layer through ion sputtering; (4) depositing a silver-doped TiN coating layer on the TiN transition layer; and (5) keeping the vacuum condition unchanged, and carrying out heat treatment,so that silver in the silver-doped TiN coating layer forms short and small silver wires at the interface of the TiN coating layer, and agglomeration is generated. Silver in the silver-doped TiN coating layer prepared through the method is prevented from spontaneously escaping onto the surface, and the short and small silver wires are formed at the interface of the TiN coating layer, so that the electrical conductivity of the TiN coating layer is improved, and the surface contact resistance of the TiN coating layer is reduced; and moreover, the corrosion resistance of the product is greatly improved, and theoretical basis and experimental evidence are provided for metallization for the polar plate of the fuel cell.

Description

technical field [0001] The invention relates to the field of metal surface treatment, in particular to a method for modifying the surface of an aluminum-based fuel cell bipolar plate, in particular to a method for preparing a silver-doped titanium nitride composite coating on the surface of an aluminum-based fuel cell bipolar plate . Background technique [0002] Proton exchange membrane fuel cell (PEMFC) is considered as the terminal power of new energy vehicles due to its advantages of high conversion efficiency, no pollution, and fast start-up. However, because most of the traditional PEMFC bipolar plates are graphite plates with a single plate thickness of 2mm, it is difficult to meet the requirements of small volume and high energy density for automotive battery packs. Therefore, substituting a metal plate with a thickness of less than 0.5 mm for a graphite plate with a thickness of 2 mm is an effective way to reduce the volume of fuel cells for vehicles. However, due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/34C23C14/16C23C14/06C23C14/58H01M4/86H01M4/88
CPCH01M4/86H01M4/88C23C14/0021C23C14/0641C23C14/0688C23C14/16C23C14/165C23C14/32C23C14/345C23C14/3464C23C14/5806H01M2004/8694Y02E60/50
Inventor 蒋百铃邵文婷马俊张新宇
Owner NANJING UNIV OF TECH
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