Tungsten Ionizers with Controlled Porosity for Cesium-Ion Engines

  • Roger Turk


Porous tungsten of a predictable high pore density has been developed for use as a high-efficiency ionizer in cesium-ion engines. Fine spherical tungsten powder was separated into six narrow size fractions ranging from 2.4 to 6.9 p in diameter. These powders were warm-pressed, at 400°C and 75,000 psi, to 74% of theoretical density. At a sintered density of 80% of theoretical, pore counts showed surface pore densities of 8 × 106 to 1.4 × 106 pores/cm2, depending upon original particle size. Curves are shown for pressed density versus sintered density for several particle sizes.


Sintered Density Powder Size Pore Density Tungsten Powder Tungsten Ionizer 
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  1. 1.
    Turk, R. R., and W. E. McKee, “Ion Engine Supporting Research and Evaluation,” Volume I, Materials Studies, NASA CR-54411, Contract NAS 3–4110.Google Scholar
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    Semchysen, A., and J. Harwood, Refractory Metals and Alloys, Interscience Publishers (New York), 1960, p. 37.Google Scholar
  3. 3.
    Dalla Valle, J. M., Micromeritics, The Technology of Fine Particles, 2nd ed., Pitman (New York), 1948, pp. 123–149.Google Scholar

Copyright information

© Springer Science+Business Media New York 1966

Authors and Affiliations

  • Roger Turk
    • 1
  1. 1.Hughes Research LaboratoriesMalibuUSA

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