| The watertight door of the ship can resist the inflow of seawater when the hull is broken,which provides an important guarantee for the normal operation of the cabin equipment and the safety of personnel when the ship is in distress.But the lubricating oil/grease inside its hinge bushing is easy to oxidize and deteriorate,which brings serious safety hazards to equipment operation.Due to the excellent self-lubricating property of steel-backed composite,it can still exert the superior properties of the materials themselves under the common extreme environmental conditions of ships such as oil-less and oil-free,so it has received extensive attention in the design,preparation and performance of ship-related friction components optimization.In this study,steel-backed ultra-high molecular weight polyethylene(UHMWPE)fabric composite was prepared by hot pressing method,and the basic characters were tested to ensure that the preparation effect reaches the expectation.Tribological tests were carried out to discover the effect of fabric layers to the composites.The results show that the fabric structure can greatly improve the friction and wear characteristics of the material,and the coefficient of friction and volume wear rate are both less than0.2 and 35×10-5 mm~3/(N·m)under the test conditions.Combining wear surface morphology analysis,the comprehensive friction performance of the steel-backed composite with one layer of fabric behaved the best,mainly expericened abrasive wear.The steel-backed composites with two and three layers of fabric can maintain good tribological properties at high speed due to the support of the lower layer of fabric,and mainly experience adhesion and fatigue wear.The graphite,molybdenum disulfide and polytetrafluoroethylene(Poly tetra fluoroethylene,PTFE)particles with 10wt.%were added as self-lubricating additives in the resin,then mixed with one layer of UHMWPE fabric to prepare steel-backed composites respectively.Tribological tests were carried out to discover the effect of self-lubricating additives to the composites.The results show that the steel-backed composite material with PTFE self-lubricating modification beahaves the best anti-friction performance under all test conditions,with coefficient of friction 41%lower than pure steel-backed composite.Better anti-wear performance shown under the rotating speed of 200r/min,the average wear rate is 62%reduced compared to pure steel-backed composite.The content of PTFE self-lubricating additives with 1,3,5,10,15wt.%were added to the resin and steel-backed composites with one layer of UHMWPE fabric were prepared respectively,the effect of self-lubricating additives on the tribological properties of steel-backed composites were studied.The results show that:1wt.%PTFE-filled steel-backed composite behaves the best comprehensive friction performance,and the lowest coefficient of friction is only 0.06 under the working condition of 350r/min,mainly experienced abrasive wear.With the increase of PTFE content,the tribological performance of the composites decreases due to agglomeration,which resulting in the loose and crush of resin layer of the composites and producing resin abrasive particles,mainly experience adhesive and fatigue wear at high speed.The tribological properties of steel-backed UHMWPE fabric composites were compared and analyzed through experiments,and the mechanism of the number of fabric layers,types and contents of self-lubricating additives on the tribological properties of steel-backed UHMWPE fabric composites were revealed.Providimg data support for the application of steel-backed UHMWPE fabric composites in ship-related harsh conditions. |
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