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Coating for metal bipolar plates of fuel cells and preparation technology

A metal bipolar plate and fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve the problems of low manufacturing cost, poor mechanical strength, and low processing efficiency

Inactive Publication Date: 2019-08-16
北京中氢绿能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Bipolar plates made of traditional graphite exhibit excellent corrosion resistance and electrical conductivity, but their disadvantages such as poor mechanical strength, large volume, many defects, high processing costs, and low processing efficiency make it increasingly difficult to meet the needs of automotive applications. Requirements for fuel cells to be smaller in size, higher in power density, lower in manufacturing cost, higher in reliability, and easier for large-scale promotion
[0005] In contrast, bipolar plates made of metal have the advantages of thin volume, high mechanical strength, high gas resistance rate, good processing technology, and high resource recovery rate, but ordinary metal bipolar plates usually have the disadvantage of poor corrosion resistance. Although precious metals can also be made into thin, conductive, and corrosion-resistant bipolar plates, the cost is too high to achieve commercial large-scale applications.

Method used

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  • Coating for metal bipolar plates of fuel cells and preparation technology
  • Coating for metal bipolar plates of fuel cells and preparation technology
  • Coating for metal bipolar plates of fuel cells and preparation technology

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Embodiment Construction

[0030] In one embodiment, after the vacuum chamber is sealed, it is evacuated to 3×10 -3 Pa, the first step is argon ion etching (voltage 1000V, current 1A), time 3min; the second step is composite transition layer deposition, high-purity Ti target (≥99.5%, voltage 300-0V, current 30-0A), high-purity Nitrogen (≥99.99%, 100-0sccm), high-purity graphite target (≥99.5%, voltage 1200V, current 5-30A), time 1min, the third step uses HIPIMS sputtering high-purity graphite target (≥99.5%, voltage 1200V , current 30A), time 10min, the thickness of the formed coating is 0.2 microns.

[0031] In another embodiment, after the vacuum chamber is sealed, it is evacuated to 3×10 -3Pa, the first step is argon ion etching (voltage 1200V, current 1A), time 3min; the second step is composite transition layer deposition, high-purity Ti target (≥99.5%, voltage 600-0V, current 20-0A), high-purity Nitrogen (≥99.99%, 80-0sccm), high-purity graphite target (≥99.5%, voltage 1000V, current 5-30A), tim...

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Abstract

A conductive corrosion-resistant coating for metal bipolar plates of fuel cells and a preparation technology are provided. The conductive corrosion-resistant coating includes a metal substrate and a conductive corrosion-resistant coating which is deposited on the metal substrate and at least partially covers the metal substrate. A method for manufacturing a metal bipolar plate including the coating is also disclosed. The metal substrate is pure titanium, and the coating is made of a composite material composed of a composite transition layer containing Ti, C and N elements and a graphite-likecarbon (GLC) surface layer. The conductive corrosion-resistant coating is deposited by high-power impulse magnetron sputtering (HPIMS).

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to the manufacturing technology of fuel cell metal bipolar plates. [0002] technical background [0003] Proton exchange membrane fuel cell (abbreviated PEMFC) is a type of fuel cell. Its working principle is that hydrogen and oxygen are passed into the two sides of the proton exchange membrane with catalysts on both sides to form a potential difference. When the external circuit is connected , The reaction of gaining and losing electrons (oxidation-reduction reaction) occurs on the electrode (catalyst), respectively, thereby generating a current that can be used. Due to its operating temperature in the normal temperature range, wide sources of hydrogen, higher efficiency than traditional internal combustion engines, and relatively mature manufacturing technologies for various parts, it is considered to be the most suitable new power source for vehicles. [0004] The structure o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/0228
CPCH01M8/0228Y02E60/50Y02P70/50
Inventor 杜谦龚兴军胡玉凤
Owner 北京中氢绿能科技有限公司
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