Comparative evaluation of MoS2 and WS2 as powder lubricants in high speed,multi-pad journal bearings

As part of a program to develop solid/powder-lubricated journal bearings, a comparative evaluation has been performed to aid in determining whether Mo S2 and WS2 powder are suitable lubricants for high-speed, extreme-environme nt multi-pad-joumal bearings. Plots of traction coefficients, friction, fri ctional power loss, and bearing pad temperature are presented as a means fo r comparing various powder lubricants. This paper primarily focuses on expe riments carried out on a three-pad journal bearing and a disk-on-disk tribo meter. Results showed that MoS2 traction curves resemble that of SAE 10 syn thetic oil. Unlike liquid lubricants, powder films have a limiting shear st rength property. Once the powder reaches this limiting value, the maximum t raction coefficient is limited and the powder essentially shears along slid ing walls. Experimental traction data shows evidence of this property in va rious powders. The thermal performance of the bearing was evaluated at spee ds up to 30,000 rpm and loads up to 236 N. Although WS2 displayed constant friction coeffi cient and low temperature with increasing dimensionless loa d, MoS2 exhibited frictional behavior resembling that of a hydrodynamic lub ricating film. In this paper, an attempt has been made to provide a criteri on for the selection of solid lubricants for use in those tribosystems that may be operated in a high speed/load regime (i.e., high strain rates) as a n alternative yard stick to conventional comparative approaches.