Double Fine Particle Peening to Create Tribological Surface Enriched with Carbon-Black and Diamond

Author:  Yutaka Kameyama, Keisuke Inaba, Hideaki Sato, Ryokichi Shimpo
Source:  ICSP-13
Doc ID:  2017058
Year of Publication:  2017
Abstract:  
Introduction: Fine particle peening (FPP) is an advanced peening technology where the surfaces are bombarded by finer shot particles than conventional shot peening. FPP has been a practical technology to improve fatigue properties and tribological properties of the mechanical components. In addition to that, FPP has an alternative potential because it can transfer shot particle elements onto the treated surfaces [1]. By enriching surfaces with the shot particle elements, FPP can provide various effects such as enhancing coating adherence [2], improving biocompatibility [3] and so on. Thus, material transfer induced by FPP possibly plays a key role to create modified surfaces. To enhance benefits from FPP, the authors have been developed special fine particles to be transferred onto the FPP-treated surfaces. Transfer induced by FPP can be accelerated by employing hybridized particles that consist a core particle and overlying material to be transferred [4]. For tribological application, two types of hybridized particles have been proposed: carbonblack/steel (CBS) particle and diamond/steel (DS) one. FPP using the CBS hybridized particle can reduce and stabilize friction coefficient of the treated surface because transferred carbon-black acts as a lubricant [5]. FPP using the DS hybridized particle embeds diamond grains on the treated surface, increasing wear resistance [6]. It is supposed that reduced friction coefficient as well as enhanced wear resistance are simultaneously achieved by enriching the surface with both of carbon-black and diamond.