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Co-precipitation was employed to synthesize Ca-based, Al 2 O 3 -stabilized sorbents for CO 2 capture. The chemical composition and morphology of the sorbents were characterized using scanning electron microscopy, X-ray diffraction and N 2 adsorption analysis. The cyclic CO 2 uptake of the materials synthesized was studied in a thermo-gravimetric analyzer and...
Dispenser cathodes operate under ultra high vacuum and high temperature conditions. Because of these harsh conditions the tungsten rhenium heater coil is surrounded by a ceramic potting material to maintain a uniform temperature profile. Many cathodes are scrapped due to cracking in the potting which could lead to thermal hot spots. This study explores alternative ceramic potting materials that pass...
Calabazas Creek Research, Inc. (CCR) is developing controlled porosity cathodes by sintering tungsten wires to create a cap over a reservoir of barium oxide, calcium oxide, and aluminum oxide. The result is a uniform array of pores for uniform emission and a large supply of barium compound for long life operation. The barium diffusion rate can be controlled by the size of the pores and the thickness...
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