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利用销盘式干滑动摩擦磨损试验机,研究了石墨铸铁在不同工况下的磨损行为,并利用XRD、SEM和EDS分析探讨了磨损机制。结果表明,不同环境温度下磨损时,随着磨损载荷的增加,石墨铸铁的磨损率变化均表现出先缓慢增大,转而快速增加,最后增加速度又明显变缓,平均摩擦因数则表现出先快速下降随后趋于某一稳定值的变化规律。常温下磨损机制主要是粘着磨损和磨粒磨损;200℃下磨损机制主要为粘着磨损和轻微氧化磨损,当载荷很大时还会出现块状剥落;400℃下磨损载荷较小时,以轻微氧化磨损和磨粒磨损机制为主;随载荷增加,磨损机制转变为严重氧化磨损和疲劳磨损,载荷继续增大则会发生块状剥落和塑性挤出。
The wear behavior of graphite cast iron under different working conditions was studied by pin-plate dry sliding friction and wear tester. The wear mechanism of graphite cast iron was studied by XRD, SEM and EDS. The results show that with the increase of the wear load, the wear rate of graphite cast iron increases slowly at first and then increases rapidly with the increase of the wear load, and finally the increase speed obviously slows down. The average friction coefficient shows the first fast Decline then tends to a stable value of the law of change. The wear mechanism at room temperature is mainly adhesive wear and abrasive wear; wear mechanism mainly at 200 ℃ adhesive wear and slight oxidation wear, when the load is large, there will be massive exfoliation; 400 ℃ lower wear load, with a slight oxidation Wear and abrasive wear mechanism mainly; with the increase of load, the wear mechanism changes into severe oxidative wear and fatigue wear, the load continues to increase the occurrence of massive spalling and plastic extrusion.