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A bipolar plate for conductive ceramics/graphite proton exchange membrane fuel cell and its manufacture method

A technology of proton exchange membranes and conductive ceramics, applied in fuel cells, fuel cell parts, battery electrodes, etc., can solve the problems of high price, high specific gravity, and no competitive advantage of conductive ceramics, and achieve excellent corrosion resistance and anti-corrosion Oxidation properties, good mechanical properties, and the effect of overcoming the problem of non-corrosion resistance

Inactive Publication Date: 2007-05-16
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of them can produce very high-purity bulk conductive ceramics through the traditional sintering process, but these conductive ceramics are relatively expensive and have a large specific weight. If they are directly used as bipolar plates for fuel cells, there is no great competitive advantage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The raw material is made of conductive ceramic titanium silicon carbon (Ti 3 SiC 2 ) powder, the purity is greater than 95wt%, and the particle fineness is less than 30μm; the artificial graphite powder, the purity is greater than 97wt%, and the particle fineness is less than 30μm. The volume percentage is 80% titanium silicon carbon (Ti 3 SiC 2 ) powder and artificial graphite powder with a volume percentage of 20% are mixed by mechanical stirring, and then fully mixed by ball milling; into a vacuum hot-press sintering furnace for hot-press sintering. During sintering, first pre-press to 4MPa, then heat up at a rate of 40°C / min. After the temperature rises to the sintering temperature of 1700°C, immediately pressurize to 30MPa, keep the temperature and hold the pressure for 1hr (hour), and pass argon gas during the whole sintering process In order to protect the gas; naturally cool to room temperature under pressure, then release the mold and polish the surface of ...

Embodiment 2

[0023] The preparation method is the same as in Example 1, and the hot-pressing sintering mixed powder is replaced with 70% titanium silicon carbon (Ti 3 SiC 2 ) powder and 30% by volume of artificial graphite powder. The test results of its basic physical properties are shown in Table 1.

Embodiment 3

[0025] The raw material is made of conductive ceramic titanium aluminum carbon (Ti 3 AlC 2 ) powder, the purity is greater than 95wt%, and the particle fineness is less than 30μm; the artificial graphite powder, the purity is greater than 97wt%, and the particle fineness is less than 30μm. Titanium aluminum carbon (Ti 3 AlC 2 ) powder and artificial graphite powder with a volume percentage of 15% are mixed by mechanical stirring, and then fully mixed by ball milling; into a vacuum hot-press sintering furnace for hot-press sintering. During sintering, first pre-press to 3MPa, then heat up at a rate of 40°C / min. After the temperature reaches the sintering temperature of 1800°C, immediately pressurize to 40MPa, keep the temperature and hold the pressure for 1 hour, and pass argon as the protective gas during the entire sintering process. ; naturally cool to room temperature under pressure, then release the mold and polish the surface of the sample with sandpaper to obtain tit...

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Abstract

The related preparation method for bipolar plate of proton exchange membrane fuel cell comprises: mixing 50-90vt% conductive ceramics and 10-50vt%graphite, hot pressing, and sintering. Wherein, the artificial graphite powder has purity over 97wt% and particle size less than 30 mum; while the conductive ceramics can be TiSiC, TiAlC, TiO2 or TiC every with purity over 95wt% and particle size less than 30 mum. This invention has well physical and chemical performances.

Description

technical field [0001] The invention relates to a bipolar plate used in a proton exchange membrane fuel cell and a preparation method thereof. Background technique [0002] Machined graphite bipolar plates are widely used as bipolar plates for proton exchange membrane fuel cells due to their good electrical and thermal conductivity and corrosion resistance. They are generally made of carbon powder or graphite powder and graphitizable resin. , the temperature of graphitization is usually higher than 2500°C, and graphitization needs to be carried out in accordance with a strict heating program, and the time is very long. In addition, after graphitization, 20%-30% of the surface of the graphite plate is generated due to the evaporation of ash impurities. stomata. Therefore, the graphite plate must be treated to reduce the porosity and improve the quality of the graphite plate. Otherwise, when it is used as a bipolar plate of a fuel cell, the fuel gas will undergo reverse osmo...

Claims

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Application Information

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IPC IPC(8): H01M4/86H01M8/02H01M4/88H01M8/04746
CPCY02E60/50Y02P70/50
Inventor 沈春晖竺兵周卫兵王玉成潘牧袁润章
Owner WUHAN UNIV OF TECH
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