β Scribed by E.L. Olcott
No coin nor oath required. For personal study only.
Experimentally derived empirical correlations will be presented which describe the influence of deposition parameters on the pyrolytic infiltration of woven and other fibrous carbon constructions of varying densities and geometries. Results are interpreted in terms of the influence of the above factors on gas phase reaction and diffusion rates within the porous structure.
W. Bradshaw (Lockheed Missiles and Space Co., Palo Alto, California). Alteration of the matrix precursor resin can be used to cause significant changes in the degree of graphitization, crystallite size and basal plane of orientation of the pyrolysed matrix in PHS carbon composites. Such changes in matrix morphology were utilized to obtain substantial improvement in the impulse threshold under dynamic loading. With respect to static mechanical properties, the most significant improvement was an increase in the amount of plastic strain-to-failure.
D. W. Bauer, W. V. Kotlensky, J. W. Warren and W. H. Smith (Super-Temp Company Santa Fe Springs, California) and Early Gray (Thiokol Chemical Corporation, Brigham City, Utah). Carbon and graphite yarns were dry wound on eleven 2 in. i.d. X 2.4 in. o.d. X 12 in. long graphite mandrels using a nominal 75" helical wind angle. The yarns were produced from three different precursors rayon, PAN and pitch. Variables investigated included yarn denier, ply, carbon and graphite states and high modulus graphite yarns and tow. Density for the as-wound cylinders varied from 0.51 g/cm3 to 0.92 g/cm3. Cylinders
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## PATENTS assembly provides a relatively high voltage at a given current density and gas flow rate.
This invention ensures sufficient gas diffusion and ion-conduction in a fuel cell catalyst electrode. This arrangement does not tequire a thick electrolyte layer to ensure sufficient transmission of ions, but enables sufficient oxygen to be fed to the catalyst.