Abstract
A manufacture of Cu-Sn-P-MoS2 type oil impregnated sintered bearing for high speed revolution applications was tried and the following results were obtained.
1) To obtaine a satisfactory yield of MoS2 added, sintering under about 750°C is necessary even in the case of large MoS2 particles (average particle size; 6μm) used in this experiment.
2) In the sintering of Cu-Sn-P compacts added MoS2, Cu-P-Mo-S compounds are formed at the surface of MoS2 particles in the range of 700-750°C. As the volume of the surface layer of MoS2 particles increases during the formation of these compounds, the adhesion between MoS2 particles and the matrix can be well improved.
It can be expected in this Cu-Sn-P-MoS2 type bearing that the thin layer of the reaction product formed around the MoS2 particles above mentioned acts as a kind of binder between the matrix and the MoS2 particles, thus prevents the solid lubricant (MoS2) from mixing into the lubricant oil under hydrodynamic condition of high speed revolutions; such an excessive mixing in general worsens the running performance under hydrodynamic lubrication of the bearing.
