ISSN: 1003-6326
CN: 43-1239/TG

Vol. 27    No. 6    June 2017

Tribological performance of lead-free Ni-contained copper-steel bimetal bearing materials
YIN Yan-guo, TANG Hong-yue, JIAO Ming-hua, ZHANG Guo-tao, XUE Lu, TIAN Ming
(Institute of Tribology, Hefei University of Technology, Hefei 230009, China)
Abstract: Lead-free Ni-contained copper-steel bimetal bearing material (CuNi9Sn6) was prepared by powder metallurgy method, its friction and wear tests were conducted by using the HDM-20 tribometer under oil lubrication condition, the corrosion resistance test was carried out under the deteriorated lubricating oil of CD15W-40 which total acid value reached 1.185×10-3 (KOH). The tribological and corrosion resistance properties were compared with those of the typical copper-lead bearing materials (CuPb10Sn10, CuPb24Sn1). The results show that the tribological properties of lead-free copper-nickel bearing material are close to those of the typical copper-lead bearing materials under the condition of low load and abundant lubrication. However, it does not include soft antifriction phase, the friction pair is prone to adhesion failure when under high load and poor lubrication conditions. And its load carrying capacity is lower than two copper-lead bearing materials. In the process of deteriorated lubricating oil corrosion, the surface of lead-free Ni-contained copper based bearing material forms a layer of protective oxide film which can prevent matrix further destruction. So, it has better corrosion resistance, the friction and wear properties decrease less. The corrosion resistance of two typical copper-lead bearing materials are worse due to the lead element is selectively corroded and dissolved, so, the tribological characteristics are greatly weakened.
Key words: Ni-contained copper; copper; lead; bearing material; tribological property; corrosion resistance
Superintended by The China Association for Science and Technology (CAST)
Sponsored by The Nonferrous Metals Society of China (NFSOC)
Managed by Central South University (CSU)