Friction And Wear Properties Of Bionic Coupling Surface On Brake Disc

Brake disc is a key component in the braking system of the rail vehicle. Theperformance of the brake disc is related to the security and stability of the train, whichfurther influences the state property and personal safety. Gray cast iron brake disc iswidely used in rail vehicle braking system owing to its good casting properties,excellent vibration resistance, good abrasion resistance and low manufacturing cost.However, the development of the railway is developing to the direction of high-speed,heavy. So the traditional gray cast iron brake discs can’t meet the requirement of thetrain braking performance. For this reason, it is imperative to improve the brake disc’sabrasion resistance and the stability of its braking performance. In fact, it’s animportant direction to improve the friction, wear and working stability of rail vehiclebrake disc for domestic and foreign scholars.After nature biological selected and eliminated, some natural molds were foundin the diversity nature as their excellent performance which can be used to solve theengineering problems. For example, a white surface morphology of soft and hard toresist seawater and sediment erosion wear were formed on the surface of scallop andscapharca subcrenata which live in intertidal environment. So the soft and hard whitestructure is applied to the surface of brake disc to improve its performance, whileguaranteeing the performance of the substrate enhancing its service lives.This paper was based on the coupling of bionic, and the laser claddingtechnology was used as a basic means to manufacture different bionic samples whichhad material shape and structure three coupling elements. The duality bionic couplingsample which was prepared by laser re-melting, ternary bionic coupling sample whichprepared by laser cladding and normal sample were explored. The effects of couplingelement characteristics and working conditions on the friction and wear properties ofthe bionic coupling samples were studied comparatively. The effects of a variety ofcladding materials on the friction and wear properties of rail vehicle brake disc wereinvestigated and the influences of the mass fraction of ceramic particles contained inthe brake disc friction and wear were analyzed. According to the research, we havedrawn the following conclusions: i) the number of nucleation has increased and grains were refined with the addition of ceramics in formation of coupling-unit; ii) thefriction and wear properties of bionic samples have increased with addition ofceramics; iii) wear resistance of grid-shaped bionic coupling specimen was superior tostripe-shaped specimen, while coefficient of friction was low, otherwise, thecoefficient of friction of the stripe-shaped sample increased, but the wear resistancewas weakened; iv) wear performance of bionic sample reduced with the addition ofload, but it changed little with addition of speed. So the brake disc surface with bioniccoupling unit had a higher and more stable coefficient of friction, superior wearresistance.