Behavior of Detergent-Dispersant in Lubricant Oil during Sliding Process and Its Effect on Frictional Properties of Fe₅Si₃-Particles Dispersed-Si₃N₄

Abstract

Frictional properties of Fe₅Si₃ dispersed Si₃N₄ were investigated using polyolester and normal oil with additives as lubricants; the following results were obtained: 1) when polyolester was used, Fe₅Si₃ dispersed Si₃N₄ showed obviously lower friction coefficient than cast iron while friction coefficient of both materials were almost the same under normal oil testing conditions; 2) chemical analysis proved that a relatively high amount of calcium-sulphonate as detergent-dispersant existed on wear track of Fe₅Si₃ dispersed Si₃N₄, while oiliness-agent was not detected. Those results suggested that adhering of calcium-sulphonate to the surface of Fe₅Si₃ dispersed Si₃N₄ reduced oiliness and raised the friction coefficient.