Rolling contact fatigue of surface coatings—a review

Abstract

The aim of this review is to survey the state of the art relating to the rolling contact fatigue (RCF) investigation of various overlay coatings and also, to ascertain the influence of design parameters such as the type of deposition process, coating material and thickness on the RCF performance. Rolling contact fatigue is a significant factor in the failure of components in rolling/sliding contact. Although, sintered ceramics have provided improvements in RCF life of components in rolling/sliding contact, e.g. hybrid ceramic bearings, the economic and technological constraints associated have so far limited their use to specialist applications. Physical and chemical vapor deposition (PVD, CVD) as well as thermal spraying are methods of depositing overlay coatings. The designer must thus choose a deposition method based on economic and technical flexibility, e.g. material choice, functional grading, etc. Amongst this family of overlay coatings, PVD coatings are already finding commercial use whilst others are at a research and development stage. The available literature on the RCF testing of various types of overlay coatings is considerable, but it is generally difficult to synthesize all of the results to obtain a comprehensive understanding of the parameters which can have a significant effect on a coating's resistance to rolling contact fatigue. This review thus compares the RCF performance of these overlay coatings and discusses the results in terms of coating processes, materials, thickness, residual stress and tribological conditions of contact stress and lubrication.

Progress in Ultrasonic Spray Pyrolysis for Condensed Matter Sciences Developed From Ultrasonic Nebulization Theories Since Michael Faraday

“…A number of previous review articles have been presented on different forms of CVD: thermal CVD [2][3][4][5][6][7][8][9][10][11], plasma enhanced PE-CVD [12][13][14][15][16][17][18][19], hot-wire or hot filament (HWCVD or HFCVD) [20][21][22][23][24][25][26][27][28] and not many of them have been as exhaustive in their respective areas. Pyrolysis, although classified under CVD in some text, has become a wide area of research and technology covering synthesis of new products, qualitative and quantitative spectroscopic analysis of fluids and, lately, alternative route to production of debri-free x-ray sources; these aspects are elaborated further in the sections that follow.…”

The Use of Triboemission Imaging and Charge Measurements to Study DLC Coating Failure

“…It has been shown that hard coatings and other surface modification methods are able to improve the resistance of rolling elements (i.e., bearings) to friction, wear and corrosion [2,3]. Thin diamond-like-carbon (DLC) coatings, for instance, provide protective, low friction, wear resistant surfaces for numerous industrial applications such as invasive and implantable medical devices, razor blades, magnetic hard discs and microelectromechanical systems [4][5][6][7][8][9][10].…”

Effect of TiCN Coating on Tribological Properties of Astaloy CrL Sintered Steel

“…The vast majority of these coatings are used to improve the resistance of cutting tools [1][2], but also other engineering equipment, which use good resistance of these coatings e.g. to classical or contact fatigue [3][4]. TiCN coating has been known for several decades, and during that time numerous papers were published dealing with such coating and its properties.…”