Study On The Properties Of Novel Self-lubricating Materials Used For Screw Pump

The MoS2-based and PTFE-based bonded coatings were prepared by air spraying, thefriction and wear behaviors of two types of bonded coatings under dry sliding condition wereevaluated using an MMW-10pin-on-disc tribometer. The worn surface morphologies of thebonded coatings were analyzed. The results showed that, the friction and wear behaviors ofMoS2-based epoxy resin bonded coatings were better than those of MoS2-based phenolic epoxyresin bonded coatings cured at the room temperature. Under the condition of the normal load of128N, at the sliding speed of180r/min, the wear mass loss of two types of PTFE-based bondedcoatings filled with Cu powder, SiC, c-BN, h-BN, T60decreased respectively, while theaverage friction coefficient had varying degrees of increasing, comparing with the unfilledcoatings. The worn surface morphologies analysis revealed that, the worn surface of the unfilledcoating appears rough, showing some obvious plucked marks caused by destruction, while acertain amount of ploughed marks have appeared on the worn surfaces of the filled coating.The Ni-based composite coatings were prepared by oxy-acetylene flame spraying. Thefriction and wear behaviors of Ni-based composite coatings under dry sliding condition wereevaluated using an MPX-2000A pin-on-disc tribometer. The worn surface morphologies ofcomposite coatings were analyzed. The results showed that, under the condition of the slidingspeed of200r/min, the average friction coefficient of the Ni-based composite coatings filledwith5wt.%WS2, graphite, h-BN, c-BN, SiC, Cu powder decreased with increasing of thenormal load. The wear mass loss of the composite coatings filled with SiC, graphite, c-BNshowed an increasing trend, while that of the composite coatings filled with WS2, h-BN, Cupowder decreased when the normal load increased from50N to100N. Moreover, the suitableamount of graphite and α-Al2O3, SiC or Cu powder showed a synergistic effect on wearresistance. The serious fatigue wear appeared on the surface of the ductile iron substrate, whilethe uniform scratches had appeared on the worn surface of the Ni-based composite coatings.The phenolic resin-based composites filled with Cu powder, alumina, graphite, MoS2wereprepared by compression molding. The friction and wear behaviors of composites under drysliding condition were evaluated using an MPX-2000A pin-on-disc tribometer. The wornsurface morphologies of composites were analyzed. The results showed that, under thecondition of the normal load of100N, at the sliding speed of500r/min, the wear mass loss ofcomposites had decreased in various degrees, respectively. Typically that of the composites filled with graphite decreased with the increasing of content of graphite, showing the best wear-resistant properties. An amount of drawn debris appeared on the worn surface of the purephenolic resin, while the obvious and uniform lubricating films presented on the worn surfacesof the composites filled with graphite.