Study On Friction And Wear Of Compacted Graphite Iron With Biomimetic Coupling By Cast-in Process

High speed train arrester is key part that assure operation performance and transportation safety. Conveyance is under high speed development, the existing arrester can't satisfy with request of high speed about operation performance and life time. Hereby, It is imperative that develop new kind of economical and durable material use for arrester.During the study of biology coupling phenomena in nature,we find: the organism formed the biomaterial in the long time evolvement which have perfect structure and special capability. The difform biomimetic coupling units were designed through imitating the shell and the dung beetle configuration and structure . With a degree of depth and a wearable bionic cover the inlay-casting bionic coupling sample was made by the combination of coupling unit and the compacted graphite iron used foundry technics .The conclusion is made by the observation of the microstructure and the microhardness test and the wear and tear test.And then we get the conclusion below:1. The joining is metallurgy join between substrates and biomimetic coupling units that we made. According to the different microstructure and shape mechanism, inlay-casting bionomic coupling sample can divided in 5 parts :unit1,unit2 interface, shock chilling zone,and substrate. Unit is un-melted H13;The form of the Interface was that melted H13 on the boundary and little high temperature molten iron jion together,and then they curdle in a very short time.Because of the high crudling speed,the microstructure was martensite in the interface;Because of shock chlling effect that the unit affords, the high temperature molten iron curdle rapidly.We call this zone the shock chilling zone which microstructure is Ld; The substrate is compacted graphite iron.when the two units come closer enough, the two shock chilling zones of their own will superpose-superposition domino offect,we define the zone between the two units influence zone. The range of the superposition will enlarge whe the unit closer.2. Due to the difference of each area's micro hardness, it present hard and soft interfaced bionic structure on the surface of inlay-casting bionic coupling. In the different form unit samples, the microhardness of the stria unit in its interface and chock chilling zong was bigger .The microhardness of interface zone will become larger when the space between the two units become closer.3. Put Si iron element on the inlay-casting bionic coupling is make for good controlling the structure of shock chilling zone, because white microstructure is reduding,the microstructure of the shock dchilling zone is optimized, and its integration performance is improved.4. Due to possess anti-wear bionic structure and thickness layer, under the same condition, inlay-casting bionic coupling wear grade is much less than normal compacted graphite iron, show good anti-wear performance.In the different shape units, strip unit is better than circle unit in anti-wear performance. In the different space units, the sampe that space is 2mm better, namely, the less space, the better anti-wear performance. under the different load, the wear loss of the foundry biomimetic coupling is larger when the load larger.5.Along the fiction direction,the substrate of the inlay-casting biomimetic coupling has a mass of wear loss and the property of adhesion obviously.The unit,interface and the shock chilling zone have a spot of wear loss and the property of adhesion unconspicuously.In the fiction and wear process of the biomimetic coupling sample, the substrate was abraded firstly and the wear loss is larger.And the other zone will higher than substrate in period of time.The surface became non-smooth surface.The wear is going unitl the non-smooth surface was rubdown .The succedent process of the sample will repeat the process before .