基于不同表面状态下的TC4钛合金螺栓摩擦机理研究

Research on friction mechanism of TC4 titanium alloy bolt based on different surface states

  • 摘要: 针对钛合金紧固件易发生的黏着和“咬死”等问题,文章研究在TC4表面未处理(LT)、脉冲阳极氧化(PA)、脉冲阳极氧化+涂铝(PA-Al)和脉冲阳极氧化+涂MoS2(PA-MoS2)等4种表面状态样品不同测试条件下的摩擦磨损特性,揭示不同表面状态条件对摩擦磨损机理的影响。选用摩擦磨损试验机(UMT-3)开展球–盘摩擦磨损实验,利用SEM-EDS、三维白光干涉形貌仪、光学显微镜仪器等对样品的磨痕形貌进行表征。通过对摩擦系数、磨损率、磨损形貌进行分析研究,探究不同表面状态下钛合金摩擦副的摩擦特性和磨损机理。研究结果表明,应避免TC4和TC4材料直接接触可以有效防止黏着磨损发生,脉冲阳极氧化(PA)样品减摩耐磨性最佳,阳极氧化涂MoS2样品次之。

     

    Abstract: Aiming at the problems of adhesion and “bite” that are prone to occur in titanium alloy fasteners, this study investigates the friction and wear characteristics of four surface state samples under different testing conditions: untreated TC4 surface (LT), pulse anodizing (PA), pulse anodizing+aluminum coating (PA-Al), pulse anodizing+MoS2 coating (PA-MoS2), and reveals the influence of different surface state conditions on the friction and wear mechanism. Using a friction and wear testing machine (UMT-3), a ball disc friction and wear experiment was conducted, and the wear morphology of the sample was characterized using SEM-EDS, three-dimensional white light interferometry, optical microscopy instruments, etc. By analyzing and studying the friction coefficient, wear rate, and wear morphology, this study explores the friction characteristics and wear mechanism of titanium alloy friction pairs under different surface states. The results show that the direct contact between TC4 and TC4 materials can effectively prevent adhesive wear. Pulse anodizing (PA) samples have the best friction and wear resistance, followed by anodized MoS2 coated samples.

     

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