高强度铸造锌合金在干摩擦条件下摩擦磨损特性之研究

本文在干摩擦条件下对高强度铸造锌合金ZA-12和ZA-27的摩擦磨损特性进行了研究,并以锡青铜ZQSn6-6-3进行了对比试验。结果表明,这3种合金与45~#钢配磨时的摩擦系数相差不大,但前两者的磨损率都比后者的低2～3个数量级,表明高强度铸造锌合金在润滑失效时仍具有良好的拉伤抗力。

Investigation on Friction and Wear Performances of High-Strength Zinc Foundry Alloys under Dry Friction Condition

The friction and wear performances of high-strength zinc foundry alloys (ZA-12 and ZA-27) were studied by comparing with that of bronze ZQSn6-6-3 under dry friction condit ion. The experiments were conducted on model MM-200 wear tester with a stationary specimen of alloys to be tested and a turning specimen of carbon steel 45, which has been quenched and tempered to HB 220-240. Under the conditions of 200rpm of speed, 500N of load and 10 minutes of time, the results are as follows: (1) The friction coefficient for the zinc alloy-15 steel pairs is close to that of the hronze-45 steel pairs. (2) Friction moment-time curves for the zinc alloy-45# steel pairs exhibit slight fluctuation, and the interfacial slip is smoothly whereas friction moment-time curves for the bronze-45# steel pairs show strong fluctuation, demonstrating severe stick-slip processes. (3) The wear rate of the zinc alloys is 2-3 orders of magnitude less than that of the bronze. This means that the zinc alloys may still safely work for a short time when an accidental failure of lubrication occurs.