ALKALI METAL BEARING AND SEAL DEVELOPMENT AT SPACE POWER AND PROPULSION SECTION. Page: 4 of 48
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6.2.2
open to space and is based on the availability of zero leakage seals. The
generator is uncanned and its temperature distribution is so that no potassium
vapor condensation or accumulation of condensate within the generator housing
will take place.
Within SPPS, bearing and seal development is being carried out under
four different programs, three of which are basic, while the last one will
combine the knowledge gained in the three previous ones. Of the three basic
programs, the first one is devoted to the study of bearing stability which
implies the establishment of proper bearing geometries and the verification
of bearing rotor response behavior. This program is carried out under NASA
contract and uses water at 1200F as a lubricant (Appendix A and B).
The second program is devoted to the establishment and selection of
suitable bearing materials. Under this program (Contract No. NAS 3-2534,
Appendix C), accurate physical properties have been established for these
materials, such as hot hardness, compressive strength, modulus of elasticity,
thermal expansion, potassium wetting and dimensional stability at 16000F.
Also, corrosion resistance and compatibility in potassium. Friction testing
is being carried out in two highly sophisticated test rigs, one operating in
a vacuum and the other one in a potassium atmosphere. This program favors
extremely hard and stable refractory materials primarily Tungsten and Titanium
Carbides using special binders. This program will not be further discussed
here because of the limitation in time. It covered three years and is close
to its completion, so its results should be available in a reasonable
time.
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Schnetzer, E. ALKALI METAL BEARING AND SEAL DEVELOPMENT AT SPACE POWER AND PROPULSION SECTION., report, October 31, 1967; Country unknown/Code not available. (https://digital.library.unt.edu/ark:/67531/metadc1035214/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.