Asymtek introduces new technologies

Asymtek has introduced two coating/dispensing technologies for applying catalyst inks onto membranes in electrode assemblies of proton exchange and direct methanol fuel cells. Pulse spray coating technology provides quick large area coverage, allowing for uniform film thicknesses. DispenseJet technology deposits the ink with a uniform

thickness and density so lines and patterns are smooth, even, and the same consistency throughout. The consistent and precision application of the ink increases the porosity of the film so fuel and byproducts can pass through the membrane efficiently. Asymtek offers fuel cell manufacturers two types of application technologies for increased dispensing flexibility: spray coating and discrete dot dispensing.

Spray coating is for large areas, for controlled thicknesses, and even film thicknesses. Discrete dot dispensing is used for specific patterns with high edge definition and exact film build up of highly volatile inks. Asymtek has a multiple array of coating and dispensing technologies for catalyst inks, polymer electrolytes, gasketing, and sealing depending on the application.

Catalyst inks are very expensive because of the platinum content. With the Asymtek jet, the ink is deposited precisely where it is programmed to be placed, so there is limited waste. The jet deposits discrete dots in whatever pattern is desired without masking. Asymtek's closed-loop system measures the exact amount of fluid that's deposited.

Process controls and Asymtek's Easy Coat(R) for Windows XP(R) (ECXP) software regulate the volume, size, shape, and viscosity of the dot. "The success of the catalyst ink depends 50% on its chemistry and 50% on its application," said Jim Klocke, Asymtek senior business development manager. "While most application methods use spray technology, the catalyst inks may vary in thickness and density. With Asymtek's jet dispensing, all those problems are eliminated and the ink is deposited precisely, with uniform thickness and density."

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