The wear and compatibility characteristics of selected bearing materials, including surface coatings and cemented refractory carbides were investigated in support of a pump development program for advanced Rankine cycle space power plants employing high temperature lithium and NaK. Compatibility of candidate materials with 1100-deg lithium in Cb-1 Zr alloy was studied in tilting capsule tests for durations to 7000 hr. The wear behavior of material combinations was evaluated with a rotating disk-static shoe assembly in lithium and NaK to 1000 deg. The best compatibility and wear characteristics were exhibited by high density molybdenum cemented carbides. Carburized Cb-1 Zr alloy wear resistance was inconsistent but, under the best conditions, was nearly equivalent to that of the cemented carbides. Plasma sprayed coatings of tungsten carbide and WC-Co gave encouraging results in NaK, but additional development of the coating process appeared necessary to assure reliable control of adhesion and performance.
Wear and Compatibility Behavior of Liquid Metal Bearing Materials
M. J. Wallace
Pratt & Whitney Aircraft, East Hartford, Conn.
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Wallace, M. J. (October 1, 1967). "Wear and Compatibility Behavior of Liquid Metal Bearing Materials." ASME. J. of Lubrication Tech. October 1967; 89(4): 466–472. https://doi.org/10.1115/1.3617031
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