The Experts below are selected from a list of 309 Experts worldwide ranked by ideXlab platform
Lin Hua - One of the best experts on this subject based on the ideXlab platform.
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fabrication of metallic bipolar plate for proton exchange membrane fuel cells by rubber pad forming
Journal of Power Sources, 2010Co-Authors: Yanxiong Liu, Lin HuaAbstract:In this paper, the rubber pad forming process is used to fabricate the metallic bipolar plate for a proton exchange membrane (PEM) fuel cell, which has multi-array micro-scale flow channels on its surface. The rubber pad forming process has the following advantages: high surface quality and dimensional accuracy of the formed parts, low cost of the die because only one rigid die is required, and high efficiency. The process control parameters (rubber hardness, internal and outer radii, Draft Angle) of the rubber pad forming are analyzed by the finite element method using the commercial software Abaqus. After that, the rubber pad forming process is used to manufacture a metallic bipolar plate of SS304 stainless steel with perfect flow micro-channels. The results of this effort indicated that the rubber pad forming process is a feasible technique for fabricating the bipolar plates of PEM fuel cells.
C G Kang - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of titanium bipolar plates by rubber forming and performance of single cell using TiN-coated titanium bipolar plates
International Journal of Hydrogen Energy, 2014Co-Authors: Mingeun Jeong, C G KangAbstract:Abstract In this study, a rubber forming method is used to fabricate titanium bipolar plates for proton exchange membrane fuel cells. A titanium blank with a thickness of 0.1 mm is compressed using a stamping mold equipped with a 200-ton hydraulic press to fabricate bipolar plates. A forming experiment is carried out by changing different parameters such as the punch velocity, punch pressure, rubber thickness, rubber hardness, and Draft Angle of the channel. The optimum forming conditions are found to be a rubber thickness of 10 mm, rubber hardness equivalent to that of Shore A 20, punch velocity of 30 mm s−1, punch pressure of 55 MPa, and punch Draft Angle of 30°. The fabricated titanium bipolar plate is coated with a TiN layer. A single cell with a TiN-coated titanium bipolar plate is examined and compared to those with uncoated titanium and graphite bipolar plates. The initial performances (in terms of current densities) of the single cells with the uncoated titanium, TiN-coated titanium, and graphite bipolar plates are 396, 799, and 1160 mA cm−2, respectively, at a cell voltage of 0.6 V.
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Effect of process parameters on forming depth of channels in fuel cell bipolar plates fabricated using rubber forming process
Materials Research Innovations, 2014Co-Authors: Mingeun Jeong, C G KangAbstract:For this study, a rubber forming process was used to fabricate the aluminium bipolar plates with microchannels that are used in proton exchange membrane fuel cells. The aluminium bipolar plates were fabricated using a 200 ton hydraulic press. The forming depth of the channels was investigated for three different Draft Angles of the upper die by using a range of parameters (punch speed, compression pressure, rubber thickness and rubber hardness). The depths that could be formed under the above conditions were 0·188 mm at a Draft Angle of 10°, 0·447 mm at a Draft Angle of 20° and 0·453 mm at a Draft Angle of 30°. The rate at which the material thinned also increased as the Draft Angle was increased from 10 to 30°.
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formability evaluation of stainless steel bipolar plate considering Draft Angle of die and process parameters by rubber forming
International Journal of Precision Engineering and Manufacturing, 2014Co-Authors: Mingeun Jeong, Gyuwan Hwang, C G KangAbstract:In this study, the rubber pad forming process is used to fabricate bipolar plates with stainless steel SUS304 for the proton exchange membrane (PEM) fuel cell. The metallic bipolar plates have received considerable attention because of their low cost, excellent mechanical, electrical, and thermal properties, and simplified fabrication techniques. The thin plate with micro channels was fabricated using a hydraulic press with a capability of 200 ton according to the process parameters of the rubber forming (punch speed, plate pressure, rubber thickness, rubber hardness) considering the Draft Angle of the die and its formability was evaluated.
Yanxiong Liu - One of the best experts on this subject based on the ideXlab platform.
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fabrication of metallic bipolar plate for proton exchange membrane fuel cells by rubber pad forming
Journal of Power Sources, 2010Co-Authors: Yanxiong Liu, Lin HuaAbstract:In this paper, the rubber pad forming process is used to fabricate the metallic bipolar plate for a proton exchange membrane (PEM) fuel cell, which has multi-array micro-scale flow channels on its surface. The rubber pad forming process has the following advantages: high surface quality and dimensional accuracy of the formed parts, low cost of the die because only one rigid die is required, and high efficiency. The process control parameters (rubber hardness, internal and outer radii, Draft Angle) of the rubber pad forming are analyzed by the finite element method using the commercial software Abaqus. After that, the rubber pad forming process is used to manufacture a metallic bipolar plate of SS304 stainless steel with perfect flow micro-channels. The results of this effort indicated that the rubber pad forming process is a feasible technique for fabricating the bipolar plates of PEM fuel cells.
Kaikai Huang - One of the best experts on this subject based on the ideXlab platform.
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investigation of stamping process of metallic bipolar plates in pem fuel cell numerical simulation and experiments
International Journal of Hydrogen Energy, 2014Co-Authors: Qinghui Hu, Dongming Zhang, Hao Fu, Kaikai HuangAbstract:Abstract Flow channel in bipolar plate for PEMFC has the function of transporting the fuel and oxygen and water. Stamping process for flow channel on metallic bipolar plates is an economic and convenient method for mass production. It is extremely important to predict and prevent the tearing, wrinkling, thinning, skid mark and spring back in stamping process. In this study, finite element method is used to predict the imperfection and analyze thickness variation during the stamping process. Dynaform software is employed to predict the performance of a stamping process. Forming Limit Diagrams are used to determine the safe limit of the metallic bipolar plates. In simulation, the dimension of flow channels, punch speed, radius of punch and die and Draft Angle were selected as variable process parameters. Experiments were conducted to compare with the simulation results. It is demonstrated that the simulation results are in good agreement with the experimental ones for ss304 metal sheets. So simulation model could be employed as a predictive tool to provide optimal parameters for better performance of the stamping process.
Mingeun Jeong - One of the best experts on this subject based on the ideXlab platform.
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Fabrication of titanium bipolar plates by rubber forming and performance of single cell using TiN-coated titanium bipolar plates
International Journal of Hydrogen Energy, 2014Co-Authors: Mingeun Jeong, C G KangAbstract:Abstract In this study, a rubber forming method is used to fabricate titanium bipolar plates for proton exchange membrane fuel cells. A titanium blank with a thickness of 0.1 mm is compressed using a stamping mold equipped with a 200-ton hydraulic press to fabricate bipolar plates. A forming experiment is carried out by changing different parameters such as the punch velocity, punch pressure, rubber thickness, rubber hardness, and Draft Angle of the channel. The optimum forming conditions are found to be a rubber thickness of 10 mm, rubber hardness equivalent to that of Shore A 20, punch velocity of 30 mm s−1, punch pressure of 55 MPa, and punch Draft Angle of 30°. The fabricated titanium bipolar plate is coated with a TiN layer. A single cell with a TiN-coated titanium bipolar plate is examined and compared to those with uncoated titanium and graphite bipolar plates. The initial performances (in terms of current densities) of the single cells with the uncoated titanium, TiN-coated titanium, and graphite bipolar plates are 396, 799, and 1160 mA cm−2, respectively, at a cell voltage of 0.6 V.
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Effect of process parameters on forming depth of channels in fuel cell bipolar plates fabricated using rubber forming process
Materials Research Innovations, 2014Co-Authors: Mingeun Jeong, C G KangAbstract:For this study, a rubber forming process was used to fabricate the aluminium bipolar plates with microchannels that are used in proton exchange membrane fuel cells. The aluminium bipolar plates were fabricated using a 200 ton hydraulic press. The forming depth of the channels was investigated for three different Draft Angles of the upper die by using a range of parameters (punch speed, compression pressure, rubber thickness and rubber hardness). The depths that could be formed under the above conditions were 0·188 mm at a Draft Angle of 10°, 0·447 mm at a Draft Angle of 20° and 0·453 mm at a Draft Angle of 30°. The rate at which the material thinned also increased as the Draft Angle was increased from 10 to 30°.
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formability evaluation of stainless steel bipolar plate considering Draft Angle of die and process parameters by rubber forming
International Journal of Precision Engineering and Manufacturing, 2014Co-Authors: Mingeun Jeong, Gyuwan Hwang, C G KangAbstract:In this study, the rubber pad forming process is used to fabricate bipolar plates with stainless steel SUS304 for the proton exchange membrane (PEM) fuel cell. The metallic bipolar plates have received considerable attention because of their low cost, excellent mechanical, electrical, and thermal properties, and simplified fabrication techniques. The thin plate with micro channels was fabricated using a hydraulic press with a capability of 200 ton according to the process parameters of the rubber forming (punch speed, plate pressure, rubber thickness, rubber hardness) considering the Draft Angle of the die and its formability was evaluated.