Tribological Properties of Aluminum Alloy treated by Fine Particle Peening/DLC Hybrid Surface Modification

Y Amano,Y Kameyama,H Nanbu,J Komotori

doi:10.1051/epjconf/20100626011

Y Amano, Y Kameyama + Show 2 more

Open Access

https://doi.org/10.1051/epjconf/20100626011

Copy DOI

Abstract

In order to improve the adhesiveness of the DLC coating, Fine Particle Peening (FPP) treatment was employed as pre-treatment of the DLC coating process. FPP treatment was performed using SiC shot particles, and then AA6061-T6 aluminum alloy was DLC-coated. A SiC-rich layer was formed around the surface of the aluminum alloy by the FPP treatment because small chips of shot particles were embedded into the substrate surface. Reciprocating sliding tests were conducted to measure the friction coefficients. While the DLC coated specimen without FPP treatment showed a sudden increase in friction coefficient at the early stage of the wear cycles, the FPP/DLC hybrid treated specimen maintained a low friction coefficient value during the test period. Further investigation revealed that the tribological properties of the substrate after the DLC coating were improved with an increase in the amount of Si at the surface.

Highlights

Aluminum alloys have been widely used in industrial applications because of their high strength-toweight ratio and good recyclability; their friction and wear behavior are unsatisfactory
These results show that a surface topography created by the Fine Particle Peening (FPP) treatment resulted in an increase in the surface roughness
We examined the possibility of improving the adhesiveness of the DiamondLike Carbon (DLC) coating on aluminum alloy by FPP treatment using SiC shot particles

Summary

Introduction

Aluminum alloys have been widely used in industrial applications because of their high strength-toweight ratio and good recyclability; their friction and wear behavior are unsatisfactory. One of the methods of improving the tribological properties of aluminum alloys is DiamondLike Carbon (DLC) coating. DLC films exhibit excellent tribological properties [1,2,3,4]; the practical applications of DLC coating have some limitations due to their low adhesion to aluminum alloy in general [5]. Previous studies have indicated that a Ti, W or SiC interlayer improved DLC/substrate interfacial adhesion, resulting in good tribological properties [6,7,8,9]. These methods are time consuming, increasing production cost

Objectives

Results

Discussion

Conclusion