·Self-lubricating mechanism:
I. Embedded solid lubricant (metal-based):
Material: bronze/iron-based powder metallurgy + graphite/molybdenum disulfide (MoS₂)/PTFE
Principle: Frictional heat is generated when the shaft rotates → lubricant seeps out from the pores of the matrix → a transfer film is formed on the friction surface
Lubricant ratio: usually 5%~30% (affects life and load-bearing capacity)
II. Engineering plastic self-lubricating:
Material: PTFE (polytetrafluoroethylene), POM (polyoxymethylene), nylon + glass fiber/carbon fiber
Principle:
PTFE molecular chain slippage → ultra-low friction coefficient (0.04~0.1)
Fiber reinforcement → improved compressive strength (up to 200MPa)