【摘要】 针对柴油机连杆轴承表面耐磨性问题，采用火焰喷涂制备了CF/PEEK复合涂层，使用SprayWatch在线检测系统分析粒子温度速度优化喷涂工艺，并采用环-块式摩擦磨损实验机研究CF/PEEK复合涂层在油润滑下摩擦性能。结果表明：与100 μm PEEK粉末相比20 μm PEEK粉末熔化状态更好；粒子温度随乙炔流量增加0.125 m~3/h上升100 ℃，随喷涂距离增加40 mm降低350℃，粒子速度受乙炔流量和喷涂距离影响较小，在 PEEK粉末中加入CF能减少喷涂过程热降解。CF/PEEK和PEEK涂层与Stellite 12合金摩擦副在室温油润滑pv值0.625-5 MPa·m/s下，两种涂层摩擦系数均随pv值增加而降低。CF/PEEK涂层摩擦系数在0.625 MPa·m/s时更高为0.02，在5 MPa·m/s时更低为0.01，在5种pv值下均比PEEK涂层低，磨损表面犁沟程少于PEEK涂层。更多还原

【Abstract】 To improve the wear resistance of diesel engine bearing surface,CF/PEEK composite coating was prepared by flame spraying.Particle behavior in terms of temperature and velocity are measured by the SprayWatch particle imaging diagnostics system.Tribological properties of the CF/PEEK composite coating had been investigated in oil-lubricated condition.The results showed that the melting state of 20 μm PEEK powder is better than that of 100 μm PEEK powder.The particle temperature increases by 100 ℃ with the increase of acetylene flow rate by 0.125 m~3/h,and decreases by 350 ℃ with the increase of spraying distance by 40 mm.The particle velocity is less affected by the acetylene flow rate and spraying distance.The addition of CF in PEEK powder can reduce thermal degradation during spraying process.Friction pairs composed of CF/PEEK composite and PEEK coating against Stellite 12 alloy were used in oil with the pv value of 0.625-5 MPa·m/s.The friction coefficient of the two coatings decreases with the increase of pv value.The friction coefficient of CF/PEEK coating is 0.02 at 0.625 MPa·m/s,and 0.01 at 5 MPa·m/s,which is lower than PEEK coating at all 5 pv values.更多还原