在氮气介质中WC-Co/Ti6Al4V摩擦副的摩擦磨损性能研究

在THT07-135型高温摩擦磨损试验机上采用销-盘式接触形式,研究了WC-Co硬质合金/Ti6Al4V钛合金摩擦副在氮气介质中的摩擦磨损性能,并与空气介质中的摩擦磨损性能进行对比.结果表明:与空气介质相比,在氮气介质中WC-Co/Ti6Al4V摩擦副的摩擦系数稍低;WC-Co硬质合金比Ti6Al4V钛合金的磨损量低得多,氮气介质具有一定的减磨作用;钛合金材料的主要磨损机理为摩擦副之间产生较强的犁沟与挤压撕裂,而硬质合金的主要磨损机理为磨粒磨损与粘结剥落.

Friction and Wear Properties of WC-Co Cemented Carbide Sliding Against Ti6Al4V Alloy in Nitrogen Gas

Rotating pin-on-disc friction test were carried out at room temperature in ambient air and nitrogen gas to investigate the friction and wear behavior of WC-Co cemented carbide sliding against Ti6Al4V alloy. Scanning electron microscope(SEM) and Energy dispersive x-ray spectroscopy(EDS) were used to examine the worn surfaces of the WC-Co pin and Ti6Al4V disc.Result shows that,compared to air,nitrogen gas brings a slight decrease in coefficient of friction,but a significant reduction in wear rate of both pin and disc.SEM observation and EDS analysis indicate a distinct difference in wear mechanism between the pin and disc.Severe grooving,squeezing,adhering and tearing interactions are the main mechanisms causing the extensive wear of disc.Abrasion,adhesion and 'pulling out' are the main mechanisms resulting in the wear of pin.