Abstract: This paper investigated the effects of wear paramaters, such as sliding speed and load, on the wear properties of Fe-based nanostructured coating. A series of Fe-based nanostructured coatings were prepared by using wire arc spray. The microstructure of the coating was characterized by SEM, EDAX, XRD and TEM. The mechanical properties of the coating were measure d by nanoindention. The wear tests of coatings were conducted on a MM2OO wear tester. The microstructure of the coating consisted of amorphous phase and nanocrystalline (Fc, Cr) Phase. The nano-grains with an average size of 46 nm were homogenously dispersed in an amorphous phase matrix. The coating was nearly full-densed with a porosity of 1.7 % and high hardness. With the increase of sliding speed and load, the wear mass of the coating increased. The nanostructured coating had excellent wear resistance, i?e . the nanostructured coating was 2 . 6 times as high as that of the 3Crl3 coating. The failure mechanism of the coatings was brittle fracture.

Key words: nanocrystalline, coating, wear resistance, wire arc spraying

Author: Xu Binshi, Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiaotong University, Shanghai 200240, China

E-mail: xubinshi@sina.com

Tribology, Vol. 29, Issue 6, 2009, 600~605