Tribological Propties Of Au Film Plated On The Modified Surface By Shot Peening In Bounadry Lubrication

Author:  H Usami, K Chou, M Ando, M Morikawa
Source:  Conf Proc: ICSP-10 Tokyo, Japan 2008
Doc ID:  2008061
Year of Publication:  2008
Abstract:  
ABSTRACT: The present study describes applicability of fine particle peening on substrate treatment of gold (Au) plating. Aluminum alloy (A6063s), recognized as difficult for plating due to the coverage of the dense oxide film was selected as the substrate. Two spherical fine particles (silica glass and fly-ash), and conventional grade abrasives (silicon carbide, black silicon carbide and white alumina) were used for impact media. These impact media were collided to the target surface with developed peening apparatus. The surface after the peening was evaluated with SEM/EDX, stylus profile meter and an atomic force microscope (AFM). In order to estimate the tribological properties including adhesion strength of the Au film in actual operating conditions, face-to-face contact friction experiment was carried out using a ring on disc type testing apparatus in boundary lubricated condition. Results of the peened surface characterization showed that the surface roughness depended on not only the size but also shape of the media and that migration of the fragment of the impact media occurred at collision to the target surface had significant influenced on the adhesion strength. In the friction experiment, it was confirmed that the lower and stable friction resistance with sufficient adhesion strength of Au film was confirmed on the peened surface containing the media migration. Therefore, it was concluded that the optimization of the peening condition including the impact media was available to increase in the adhesion strength of the Au plating. KEY WORDS Fine particle peening, Friction and wear, Migration, Adhesion strength, Aluminum alloy, Au plating, Substrate treatment