The Modification Study Of Anti-friction And Anti-wear UHMWPE For Marine Equipment

The rapid development of Marine economy has promoted the high-quality development of national economy.Therefore,the study of engineering equipment materials in ocean development has become one of the research hotspots at home and abroad.Among them,the friction pair materials used in Marine engineering equipment are of great significance to the long-term,safe and reliable operation of engineering equipment.In this paper,the anti-friction and anti-wear modification method of ultra-high molecular weight polyethylene(UHMWPE)is studied.The research contents and results are as follows:(1)The characteristics of UHMWPE/PAANa composite and the tribological properties of the composite sliding against GCr15 steel were studied.It was found that the surface hardness and crystallinity of UHMWPE/PAANa composite changed slightly compared with UHMWPE.When PAANa content is low,the friction coefficient is lower than UHMWPE,but the wear amount is almost the same.On the one hand,the dissolved layer formed by the hydrolysis of PAANa in seawater as a lubricating layer reduces the friction coefficient;on the other hand,Ca2+ and Mg2+in seawater are deposited on the surface of materials,forming the anti-wear layer of CaCO3 and Mg(OH)2.In addition,the charge action of the material can repel corrosive ions in water and reduce the corrosion of GCr15,thus reducing wear.Plastic deformation is the main wear mechanism of composite materials.However,when the content of PAANa is high,the friction coefficient of the material becomes unstable and the wear amount also increases sharply,and the wear mechanism turns to spalling.(2)The characteristics of UHMWPE/Ph4Sn composite and the tribological properties of the composite sliding against GCrl5 steel were studied.It was found that the surface hardness and crystallinity of UHMWPE/Ph4Sn composite decreased first and then increased with the increase of Ph4Sn content.The tribological results show that adding Ph4Sn can reduce the wear amount of composite,and the friction coefficient is almost unchanged.The composites with Ph4Sn content of 1-2%wear less.The Ph4Sn with rigid structure is beneficial to bear friction load and avoid plastic deformation,thus increasing the wear resistance of UHMWPE/Ph4Sn composite.With the increase of Ph4Sn content,the main wear mechanism of UHMWPE/Ph4Sn composites would change.The main wear mechanism of composite materials is changed from adhesive wear of UHMWPE to plastic deformation with low Ph4Sn content and finally to abrasive wear.(3)The preparation method of UHMWPE/PAANa/Ph4Sn composite was proposed,and the tribological properties of the composite sliding against GCr15 steel were studied.It was found that the surface hardness and crystallinity of UHMWPE/PAANa/Ph4Sn composite changed slightly.A lubrication layer was formed on the composite surface after immersing in artificial seawater.In seawater environment,the friction coefficient of UHMWPE/PAANa/Ph4Sn composite material significantly decreased with the increase of PAANa content.With the increase of Ph4Sn content,the wear resistance of UHMWPE/PAANa/Ph4Sn composite material was greatly improved compared with pure UHMWPE.