Tribology performances of molybdenum disulfide reinforced thermoplastic polyimide under dry and water lubrication conditions

摘要

Purpose - To provide some useful information on tribology performances of molybdenum disulfide (MoS{sub}2) reinforced thermoplastic polymide under dry and water lubrication conditions. Design/methodology/approach - The effect of MoS{sub}2 content on composites' mechanical and tribological performances was investigated and worn morphologies, elements distribution and wear mechanisms under dry and water lubricant condition were also analyzed. Findings - As a result, the composites' main mechanical performances decreased partly compared with pure PI and it became more stable with MoS{sub}2 content unceasingly increasing (up to 20wt%). In the dry sliding condition, the friction coefficient decreased obviously by filling MoS{sub}2. The wear of composites which filled 10-15 wt% MoS{sub}2 was less than other composites in which MoS{sub}2 content was below to 5wt% or high than 20wt%. It was found that materials wear happened mainly at initial stages of tribology test which the temperature was so high and the adhesive wear had a dominant place during the test process. While in the water lubrication condition, the composites tribological performances were improved evidently and MoS{sub}2 was still an effective lubricant and the fatigue wear was the main factor during the tribology process. Originality/value - The paper analyzed the MoS{sub}2's effect on materials mechanical and tribological performances and divided the tribology process into two parts according to materials friction and wear.