Comparison of the wear properties of modified ZA-8 alloys and conventional bearing bronze

• Published in: Materials in engineering 2007, Vol.28 (6), p.1889-1897
• Main Authors: Türk, Ahmet, Kurnaz, Can, Şevik, Hüseyin
• Format: Article
• Language: English
• Subjects: Friction; Wear resistance; ZA-8; Zn–Al alloys
• ISSN: 0261-3069
• DOI: 10.1016/j.matdes.2006.04.010

In this study, an attempt has been made to examine the wear response of some modified Zn–Al based alloys and a conventional bearing bronze (SAE 660) at the sliding speeds of 0.5 ms −1, 1 ms −1, 1.3 ms −1, 1.7 ms −1 and 2 ms −1 using applied load of 30 N and 45 N. The standard ZA-8 alloy and modified with 1% Pb, 1% Sn and 1% Cd alloys have been subjected to a pin-on-disc wear test under dry condition. A conventional bearing bronze has also been subjected to identical tests with a view to assess the working capability of the modified Zn–Al based alloys with respect to existing ones. The results have shown that the ZA-8 alloy and modified with Pb, Sn and Cd alloys revealed higher wear resistance when compared with bearing bronze. In addition, wear resistance of ZA-8 based alloys increased with increasing sliding speed up to 1.7 ms −1 for 30 N and 1.3 ms −1 for 45 N, respectively. But it decreased with increasing sliding speed. The addition of Pb to the ZA-8 alloy increased wear resistance of the alloy for all of the sliding speeds at 30 N and 45 N, while the addition of Cd increased wear resistance of the ZA-8 at 45 N. But Sn alloying element caused worse wear resistance for ZA-8 alloy. On the other hand, the friction coefficients of ZA-8 and modified alloys are higher than that of the bearing bronze. Metallographic studies showed that the addition of Pb, Sn and Cd resulted in modifying on the microstructure of ZA-8 alloy.