Study on tribology of liquid-solid formed CuPb₂₀Sn₅/Carbon steel bimetal

Abstract

Taking CuPb20Sn5 as the research object, the CuPb20Sn5/Carbon steel bimetallic sample was prepared by the solid-liquid compound method, and the relationship between the microstructure and friction properties of the bimetallic CuPb20Sn5 layer. The results show that the Cu3P and δ (Cu31Sn8) phases in CuPb20Sn5 are distributed in the α-Cu to improve the wear resistance of the alloy. The friction coefficient fluctuates in the range of 0.057~0.093, when the load was 150 N-350 N. When the speed exceeds 3.86 m/s, as the load increases, the friction coefficient first increases and then decreases, and the wear rate increases. When the load was less than 250 N, the wear surface of CuPb20Sn5 was smooth, and the material was basically free of wear. When the load was 300 N, the friction coefficient reaches the lowest point, and the third body friction layer was formed in CuPb20Sn5 layer, and the wear mechanism was slight adhesive wear. When the load was greater than 300 N, Pb will fall off the CuPb20Sn5 surface, and the friction coefficient increase, causing abrasive wear.

Effect of Bi Content on the Microstructure, Mechanical and Tribological Properties of Cu-Sn Alloy

“…Figure 10 provides the elements distribution results of the worn surface of the Cu-7Bi-10Sn alloy. It can be seen that the elements of Sn and P are distributed around Bi phase, and it shows that the friction process also plays a role in reducing wear [30][31][32]. The above results indicate that the wear mechanisms of the Cu-10Pb-10Sn alloy and Cu-xBi-10Sn are mainly dominated by abrasive wear.…”

“…Figure 10 provides the elements distribution results of the worn surface of the Cu-7Bi-10Sn alloy. It can be seen that the elements of Sn and P are distributed around Bi phase, and it shows that the friction process also plays a role in reducing wear [30][31][32].…”