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Generation of Defined Tribofilms and Their Stability Under Slip-Rolling in a 2Disk Test Rig
Tribofilms formed by additives in lubricants represent a key mechanism for preventing wear but are difficult to investigate because of the complexity of the composition of lubricants, their small thickness, and their amorphous nature. The tribological profile of such tribofilms can be established based on a new test methodology described here. For a large range of additives, the corresponding chemically reactive tribofilms were generated in 2Disk test rigs on widely used reference steels, such as 100Cr6 (SAE52100), Cronidur 30 (AMS 5898), or 20MnCr5 Quenched & Tempered (Q&T) (SAE4820/SAE5120), during slip-rolling in the mixed/boundary lubrication regime at 120°C. The performance of the created tribofilms is compared to those created on alternative steels, such as 36NiCrMoV1-5-7, 45SiCrMo6, or even Diamond-Like Coating (DLC)-coated steels, using the same additives.
Automotive Lubricant Testing and Advanced Additive Development
"Twelve peer-reviewed papers focus on both the chemical and tribological aspects of automotive lubricant testing and additive development. In order to help the automotive industry meet lower emission standards, higher fuel economy goals, and longer drain intervals associated with a minimization of any adverse environmental effects, the petroleum industries and the additive suppliers are developing low SAPS (sulfated ash, phosphorus, and sulfur) and high tribological performance lubricants to meet these challenges. These papers cover: Impact of additive and base oil on engine oil characteristics Low SAPS lubricant development and testing Link between additive chemistry and emissions. Tribological performance issues such as fuel economy retention, wear protection, and friction reduction Powertrain developments Industrial standard tests methods for lubricant oxidation Various surface engineering applicators in practice."--Publisher's website.
Characterization and Control of Interfaces for High Quality Advanced Materials III
This proceedings volume features 59 peer-reviewed papers from ICCCI2009 on interface characterization and control technology, powder and composite processing, joining, the control of airborne particulates, new metallic glasses, and interface phenomena at high temperature. ICCCI2009 was supported by the Global COE Program “Center of Excellence for Advanced Structural and Functional Materials Design” lead by Professor Tomoyuki Kakeshita at Osaka University, the Project on Joining Technology for New Metallic Glasses and Inorganic Materials, the Institute of Materials Research (IMR) of Tohoku University, the Materials and Structures Laboratory (MSL) of the Tokyo Institute of Technology, Kobe Gakuin University, Hosokawa Powder Technology Foundation, the Japan JSPS 124th Committee, and the Joining and Welding Research Institute (JWRI) of Osaka University. Over 160 scientists and engineers from academia and industry from 18 different countries attended ICCCI2009 to see and discuss 140 invited and contributed presentations and posters on the state-of-the-art of interface characterization and control for particulate materials, joining, and nanotechnology.
Surface Modification and Mechanisms
Leading readers through an extensive compilation of surface modification reactions and processes for specific tribological results, this reference compiles detailed studies on various residual stresses, reaction processes and mechanisms, heat treatment methods, plasma-based techniques, and more, for a solid understanding of surface structural changes that occur during various engineering procedures. This unique book explores topics previously ignored in other texts on surface engineering and tribology, offers guidelines for the consideration and design of wear life and frictional performance, and sections on laser impingement and nanometer scale surface modification.
New Advances in Vehicular Technology and Automotive Engineering
An automobile was seen as a simple accessory of luxury in the early years of the past century. However, in the present days it's undeniable the amount of technology and human effort applied by the vehicular industry for developing high?quality vehicles, but still, cheap for the common person. In this context, this book tries not only to fill a gap by presenting new and updated subjects related to the vehicular technology and to the automotive engineering but also to provide guidelines for future research. This book is a result of many valuable contributions from worldwide experts of automotive's field. The amount and type of contributions were judiciously selected to cover as possible the widest range of research. The most recent and cutting?edge subjects can be found in this book, e.g., electronics, mechanics, materials, and manufacturing.
Mechanical Properties and Performance of Engineering Ceramics and Composites X
The Ceramic Engineering and Science Proceeding has been published by The American Ceramic Society since 1980. This series contains a collection of papers dealing with issues in both traditional ceramics (i.e., glass, whitewares, refractories, and porcelain enamel) and advanced ceramics. Topics covered in the area of advanced ceramic include bioceramics, nanomaterials, composites, solid oxide fuel cells, mechanical properties and structural design, advanced ceramic coatings, ceramic armor, porous ceramics, and more.
Stribeck-Type Curves of Alternative Engine Oils
Wear tests are often used in engine development in order to characterize the functional profile of surfaces interacting with lubricants. This paper proposes a new test procedure to determine Stribeck-type curves for the tribosystem piston ring/cylinder liner involving test pieces prepared from engine components. The variation of the friction coefficient with sliding speed depends on the structure and constitution of the base oil, the viscosity index, the surface topography of the liner and ring, and the friction modifiers used. Novel organic friction modifiers of low molecular mass not only reduce the friction coefficients under mixed / boundary lubrication, but also in the fluid film regime. In addition, the influence of surface roughness on the wettability of surfaces can be significant for both static and dynamic wetting. For this reason, the interaction of the lubricant with the surfaces was also investigated to enable a correlation between the surface properties of the liquid and solid phases and the tribological behavior.
Grease
Everybody has made use of grease in their daily lives. The word "grease" originates from the early Latin word "crassus," meaning fat. For our purposes, in this Special Issue, we will be focusing on lubricating grease, for publication in the eponymous journal Lubricants. According to ASTM, lubricating grease may be defined as "a solid-to-semi-fluid product of dispersed thickening agents in a liquid lubricant". Other functional ingredients, such anti-wear and extreme pressure additives, may be included, with the overall goal of inducing special properties/functionalities. Grease is a very complex lubricant. We have never had a Special Issue focusing on this key product, and lubricating greases...
