摘要:
An exemplary method of treating a material such as carbon or graphite to render at least some surfaces of the material hydrophilic includes coating at least a portion of the at least some surfaces with an oxygenated element and controlling a rate of a breakdown of the oxygenated element to leave a corresponding elemental oxide on the surfaces. In one example, the material is treated before being incorporated into an article comprising the material. Another example method includes treating an article comprising the material. Disclosed examples include precipitation or decomposition as the breakdown of the oxygenated element.
摘要:
An exemplary method of treating a material such as carbon or graphite to render at least some surfaces of the material hydrophilic includes coating at least a portion of the at least some surfaces with an oxygenated element and controlling a rate of a breakdown of the oxygenated element to leave a corresponding elemental oxide on the surfaces. In one example, the material is treated before being incorporated into an article comprising the material. Another example method includes treating an article comprising the material. Disclosed examples include precipitation or decomposition as the breakdown of the oxygenated element.
摘要:
A water transport plate assembly that is useful in fuel cells includes at least one hydrophilic article such as a flow field layer. A method of making the hydrophilic article includes establishing a hydrophilicity of the article by including a plurality of graphite particles (112) having a particular physical characteristic that imparts the hydrophilicity to the article. In one disclosed example, the selected graphite particles (112) have a wettability ratio of a hydrophilic surface area to a total surface area that is sufficient to make the article hydrophilic. In a disclosed example, the wettability ratio is more than 0.10. In a disclosed example, the graphite particles are selected based upon a percentage of prismatic surface area of the total surface area.
摘要:
An exemplary method of making a hydrophilic article includes controlling a rate of precipitation of titania from a titanate to allow coating at least a selected portion of the article with the titanate before the precipitation is complete.
摘要:
In one example, a fuel cell utilizes a non-carbonized, non-graphitized porous polymer water transport plate having a water permeability of less than 30×10−17 m2. The water transport plate is part of a fuel cell that employs an evaporative cooling loop. In one example, the water transport plate has a bubble pressure of less than 5 psig. The water transport plate is less costly and easier to manufacture.
摘要:
A process for making a hybrid ceramic article is disclosed. The process involves embedding an array of refractory ceramic tiles in a fiber reinforced glass-ceramic matrix composite substrate. The hybrid ceramic article so formed exhibits high thermal stability and elevated temperature load-bearing ability.
摘要:
Fiber reinforced glass or glass-ceramic matrix composite articles are described which comprise spaced apart face sheets connected by ribs which extend between the face sheets. The fibers in the ribs are interwoven with the fibers in the face sheets, thereby producing a structure having high shear strength.