The Tribological Behavior of ZSnSb11Cu6 Babbitt Alloy and ZSnSb12Cu6Cd1 Babbitt Alloy under Oil Lubrication Condition
摘要
The mechanical property and especially tribological property of ZSnSb11Cu6 Babbitt alloy and ZSnSb12Cu6Cd1 Babbitt alloy against different counterbody materials under oil lubrication condition were compared. Compared with ZSnSb11Cu6, HBW, σ0.2, σb and τb of ZSnSb12Cu6Cd1 increases by 29.6, 40.6, 55.6 and 35.7%, respectively. However, the tribological property of ZSnSb12Cu6Cd1 is inferior. The friction coefficient and wear rate of ZSnSb11Cu6 against 35CrMoA are 85.9 and 80.1% of ZSnSb12Cu6Cd1, respectively. The friction coefficient and wear rate of ZSnSb11Cu6 and ZSnSb12Cu6Cd1 against 18Mn12Cr18Ni2N are 5.1 times and 6.2 times higher than those against 35CrMoA, respectively. SnSb phase and Cu6Sn5 phase have important effects on the hardness, strength, anti-friction property and wear resistance, which are determined by the synthetic effect of adding Cd, Ni and using high pouring temperature. Although it was reported that Cd addition helps to refine SnSb phase, high pouring temperature of ZSnSb12Cu6Cd1 conversely makes SnSb cuboids larger and sharper. Besides, Ni addition reduces the amount of Cu6Sn5 phase. SnSb particles with large size and sharp corner are detached from the matrix easily. The crushing and spalling of Cu6Sn5 particles lead to the formation of some pits, peelings and cracks. Among three kinds of counterbody materials, 35CrMoA steel is the most suitable to be used as the counterbody material of ZSnSb11Cu6 alloy and ZSnSb12Cu6Cd1 alloy. In order to take advantage of Cd in ZSnSb12Cu6Cd1 alloy, the optimization of casting parameters especially the pouring temperature is needed.