Wear and Compatibility Behavior of Liquid Metal Bearing Materials

[+] Author and Article Information
M. J. Wallace

Pratt & Whitney Aircraft, East Hartford, Conn.

J. of Lubrication Tech 89(4), 466-472 (Oct 01, 1967) (7 pages) doi:10.1115/1.3617031 History: Received August 04, 1966; Online July 11, 2011


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.

Copyright © 1967 by ASME
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