表面微织构对WC-8Co在往复摩擦磨损中粘结-扩散磨损特性的影响

采用激光表面纹理化在WC-8Co上制备了微沟槽织构，通过往复式摩擦磨损试验对其与Ti6Al4V接触的耐磨性进行分析，并以无表面微沟槽织构的WC-8Co为对比样品，研究了表面微织构对WC-8Co粘结-扩散磨损特性的影响，揭示了摩擦过程中表面微织构的磨损机理. 结果表明:WC-8Co上的微沟槽对摩擦接触面具有抗粘结作用，在高接触载荷下，这种效应更为明显. 织构表面的抗粘结机制是由微沟槽包裹的碎屑产生的. 此外，与无表面微织构的WC-8Co不同，表面织构化的WC-8Co的磨损最初来源于微沟槽边缘的断裂，随后扩展到摩擦表面. 这种磨损特性归因于微沟槽边缘的高热载荷和机械应力集中，以及激光加工过程中WC晶粒长大与摩擦过程中粘结剂Co扩散的协同效应. 

Effect of Surface Micro-Texturing on Adhesion-Diffusion Wear Behavior of WC-8Co in Reciprocating Sliding

This study investigated the influence of surface micro-texturing on adhesion-diffusion wear behavior of the WC-8Co and revealed the wear mechanism of surface micro-texturing. The micro-grooved texture was prepared on WC-8Co by laser surface micro-texturing, and its wear resistance in contact with Ti6Al4V was evaluated through the reciprocating friction and wear test. The untextured WC-8Co was utilized as a control sample. The test results illustrated that the micro-groove on the WC-8Co was capable of anti-adhesion on the contact face, especially under high contact load. The anti-adhesion mechanism of the textured surface was resulted from the entrapment of debris by the micro-groove. Moreover, unlike the untextured WC-8Co, the wear of the textured WC-8Co initially derived from the breakage of the micro-groove edge, and subsequently propagated to the friction surface. This wear behavior was attributed to the high thermal load and mechanical stress concentration on the micro-groove edge, as well as the synergistic effects of WC grain growth during laser machining and element diffusion in the sliding friction process.