A water transport plate is provided with optimized physical characteristics to greatly improve fuel cell operation. In a preferred method of manufacturing, graphite powder, reinforcing fibers, cellulosic fibers, and a thermosetting resin are mixed with a liquid to form a slurry and showered onto a s
A water transport plate is provided with optimized physical characteristics to greatly improve fuel cell operation. In a preferred method of manufacturing, graphite powder, reinforcing fibers, cellulosic fibers, and a thermosetting resin are mixed with a liquid to form a slurry and showered onto a screen to form a planar sheet which is dried to form paper. The paper is cut into the desired size and is laid-up. The lay-up is laminated with pressure and heat, carbonized, and graphitized to form a water transport plate for later machining as desired. The finished water transport plate exhibits optimal physical characteristics for bubble pressure, water permeability, median pore size, porosity, thru-plane resistivity and compressive yield strength.
대표청구항▼
What is claimed is: 1. A method of using a water transport plate in a fuel cell, comprising the steps of: providing a porous water transport plate having a maximum thru-plane resistivity of 0.04 ohm-cm, a minimum compressive yield strength of 750 psi, maximum id="INS-S-00001" date="20061017" median
What is claimed is: 1. A method of using a water transport plate in a fuel cell, comprising the steps of: providing a porous water transport plate having a maximum thru-plane resistivity of 0.04 ohm-cm, a minimum compressive yield strength of 750 psi, maximum id="INS-S-00001" date="20061017" median id="INS-S-00001" pore size of 3.0 microns and minimum open porosity of 30 volume percent; filling said porous water transport plate with water; and employing said porous water transport plate in a fuel cell for management of water therein. 2. The method of claim 1, further comprising the steps of: creating bubble pressure in said porous water transport plate in the range of 5 to 15 psig; and providing water permeability of said porous water transport plate in the range of 30횞10-17 m2 to 2,000횞10-17 m2. 3. The method of claim 1, wherein said thru-plane resistivity of said porous water transport plate is approximately 0.02 ohm-cm. 4. The method of claim 1, wherein said compressive yield strength of said porous water transport plate is approximately 1,050 psi. 5. The method of claim 1, wherein said id="INS-S-00002" date="20061017" median id="INS-S-00002" pore size of said porous water transport plate is approximately 1.9 microns. 6. The method of claim 1, wherein said open porosity of said porous water transport plate is approximately 40 volume percent. 7. The method of claim 2, wherein said bubble pressure within said porous water transport plate is approximately 10.5 psig. 8. The method of claim 2, wherein said water permeability through said porous water transport plate is approximately 200횞10-17 m2. 9. A method of using a porous water transport plate in a fuel cell, comprising the steps of: providing a porous water transport plate having a maximum thru-plane resistivity of 0.04 ohm-cm, a minimum compressive yield strength of 750 psi, maximum id="INS-S-00003" date="20061017" median id="INS-S-00003" pore size of 3.0 microns and a minimum open porosity of 30 volume percent; filling said porous water transport plate with water; creating bubble pressure in said porous water transport plate in the range of 5 to 15 psig; and providing water permeability of said porous water transport plate in the range of 30횞10-17 m2 to 2,000횞10-17 m2; employing said porous water transport plate in a fuel cell for management of water therein. id="INS-S-00004" date="20061017" 10. A method of using a porous water transport plate in a fuel cell, comprising the steps of: filling said porous water transport plate with water; providing water permeability of said porous water transport plate in the range of 30횞10(-17) meters squared to 2,000횞10(-17) meters squared; and employing said porous water transport plate in a fuel cell for management of water therein. id="INS-S-00004" id="INS-S-00005" date="20061017" 11. The method of claim 10 comprising creating bubble pressure in said porous water transport plate in the range of 5 to 15 psig. id="INS-S-00005" id="INS-S-00006" date="20061017" 12. The method of claim 11 comprising providing said porous water transport plate with a minimum open porosity of 30 volume percent. id="INS-S-00006" id="INS-S-00007" date="20061017" 13. The method of claim 11 comprising providing said porous water transport plate with a density of 1.00-1.40 gm/cubic cm. id="INS-S-00007"
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