High conductivity, corrosion resistance and long life max phase solid solution composite coating, its preparation method and application

A composite coating and long-life technology, which is applied in coatings, metal material coating processes, circuits, etc., can solve problems that affect battery life and performance, increase interface contact resistance, and insufficient target ionization rate, etc., to improve Corrosion resistance, high plasma density, and the effect of avoiding columnar defect penetration

Active Publication Date: 2021-09-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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Problems solved by technology

[0004] However, in the long-term working environment of proton exchange membrane fuel cells, the oxide film formed by the oxidation of the MAX phase coating will lead to an increase in the interface contact resistance after corrosion, which seriously affects the life and performance of the battery.
At the same time, the deposition of sputtering composite targets by DC magnetron sputtering technology is the main method to prepare solid solution MAX phase coatings, but the ionization rate of the targets is insufficient, the deposition rate is low, and the prepared coatings will have columnar structure defects, corrosion, etc. The ionic medium will corrode the substrate through the pores between the columnar structures, and accelerate the degradation of the performance of the plate

Method used

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  • High conductivity, corrosion resistance and long life max phase solid solution composite coating, its preparation method and application
  • High conductivity, corrosion resistance and long life max phase solid solution composite coating, its preparation method and application
  • High conductivity, corrosion resistance and long life max phase solid solution composite coating, its preparation method and application

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preparation example Construction

[0025] One aspect of the embodiments of the present invention provides a method for preparing a high-conductivity, corrosion-resistant, and long-life MAX phase solid-solution composite coating, comprising:

[0026] Provide metal bipolar plate substrate;

[0027] Using high-power pulsed magnetron sputtering technology, alternately deposit Ti-Al-C layers and Ti-Sn-C layers on the surface of the metal bipolar plate substrate, thereby forming an alternate stack of Ti-Al-C / Ti-Sn-C layer, wherein the Ti-Al-C / Ti-Sn-C alternate stacking layer includes 2 to 10 alternate stacking periodic layers, and each alternate stacking periodic layer includes a Ti-Al-C layer and a Ti-Sn-C layer ;

[0028] And, vacuum heat treatment is carried out on the Ti-Al-C / Ti-Sn-C alternate lamination to form Ti 2 (Al 1-x sn x ) CMAX phase solid solution composite coating, that is, high conductivity, corrosion resistance and long life MAX phase solid solution composite coating, where 0

[0029] In ...

Embodiment 1

[0053] In this embodiment, the substrate is a 316L stainless steel bipolar plate used in a proton exchange membrane fuel cell, and the Ti on the surface of the substrate is 2 (Al 0.5 sn 0.5 ) The preparation method of C MAX phase solid solution composite coating is as follows:

[0054] (1) The surface of the polished metal substrate is first ultrasonically cleaned with acetone and ethanol for 10 minutes and dried, then put into the cavity, and the vacuum pressure in the cavity is 3.0×10 -5 Below Torr, 50 sccm of argon gas is introduced into the vacuum chamber, the voltage of the linear anode ion source is set to 1200V, the bias voltage of the substrate is -200V, and the substrate is etched with ionized argon ions for 30 minutes;

[0055] (2) The Ti-Al-C layer was deposited by high-power pulsed magnetron sputtering technology, in which Ti 0.5 Al 0.5 Alloy target provides Ti source and Al source, gas CH 4 Provide C source, CH 4 Flow rate is 2sccm, argon flow rate is 100scc...

Embodiment 2

[0061] In this embodiment, the substrate is a 316L stainless steel bipolar plate used in a proton exchange membrane fuel cell, and the Ti on the surface of the substrate is 2 (Al 0.6 sn 0.4 ) The preparation method of C MAX phase solid solution composite coating is as follows:

[0062] (1) The surface of the polished metal substrate is first ultrasonically cleaned with acetone and ethanol for 10 minutes and dried, then put into the cavity, and the vacuum pressure in the cavity is 3.0×10 -5 Below Torr, 50 sccm of argon gas is introduced into the vacuum chamber, the voltage of the linear anode ion source is set to 1200V, the bias voltage of the substrate is -200V, and the substrate is etched with ionized argon ions for 30 minutes;

[0063] (2) The Ti-Al-C layer was deposited by high-power pulsed magnetron sputtering technology, in which Ti 0.3 Al 0.7 Alloy target provides Ti source and Al source, gas CH 4 Provide C source, CH 4 Flow rate is 2sccm, argon flow rate is 100scc...

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Abstract

The invention discloses a high-conductivity, corrosion-resistant and long-life MAX phase solid-solution composite coating, its preparation method and application. The preparation method comprises: adopting high-power pulsed magnetron sputtering technology to alternately deposit Ti-Al-C layers and Ti-Sn-C layers on the surface of the metal bipolar plate substrate, thereby forming Ti-Al-C / Ti-Sn ‑C alternate stacks; vacuum heat treatment is performed on the Ti‑Al‑C / Ti‑Sn‑C alternate stacks to form Ti 2 (Al 1‑x sn x ) C MAX phase solid solution composite coating. The MAX phase-solid composite solution coating provided by the invention has high electrical conductivity and excellent corrosion resistance, and Ti 2 (Al 1‑x sn x ) SnO formed after corrosion of C MAX phase solid solution composite coating 2 The passivation film has good electrical conductivity, which will effectively improve the long-term electrical conductivity and corrosion resistance of the metal bipolar plate material.

Description

technical field [0001] The invention belongs to the technical field of metal surface coating protection, and relates to a MAX phase solid-solution composite coating, its preparation method and application, in particular to a high-conductivity, corrosion-resistant and long-life Ti 2 (Al 1-x sn x ) C MAX phase solid solution composite coating and its preparation method and application. Background technique [0002] Hydrogen energy and fuel cells are listed as national strategic emerging industries, among which proton exchange membrane fuel cells (PEMFCs) account for 83% of fuel cells, becoming the key to technological competition in the battery industry. However, under the high-temperature and acidic working environment of PEMFCs, the high interface contact resistance and corrosion of the core component metal bipolar plate are the key technical bottlenecks that determine the battery life. The use of surface coating technology can improve the electrical conductivity and corr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/06C23C14/58C23C14/35H01M8/0228
CPCC23C14/0635C23C14/5893C23C14/5806C23C14/3485C23C14/352C23C14/0036C23C14/345H01M8/0228Y02E60/50
Inventor 汪爱英马冠水张栋王振玉李昊
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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