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Contribution of friction processes to the environmental pollution was proven in several studies, especially with respect to release of particulate emissions containing metals. Not too many researchers pay attention to volatile organic compounds formation during braking, although it is very relevant topic. When organic friction materials are used, the oxidative processes and thermal degradation always...
In nuclear power plants, tubes of the rod cluster control assemblies undergo impacts at low contact pressures against guides, causing specific wear on the contact surfaces. The present study investigates fretting wear behavior under variable loading, using an original double-actuator fretting wear system which allows independent control of tangential sliding and normal force fluctuation. Using this...
The present era is dominated by nano-materials. Researchers are keen to explore the potential of nano-particles (NPs) in composites because of their intensive interaction with the matrix and surfaces due to very large surface area.Potassium titanate (KT) is used as a filler in a good quality non-asbestos organic (NAO) friction materials (FMs). Based on a little information available in the literature,...
Pressure ulcers are a common injury of the skin which leads to pain and potential infection for patients and financial burden to the healthcare providers across the global due to treatment costs, litigation and extended hospital stays. The current study focuses on one of the causes of pressure ulcer formation, ischemia. Blood vessels are deemed to be deformed and blood flow restricted when skin is...
The damages of the surfaces of the hydraulic concrete structures are usually caused by abrasive action of the debris carried by the water. The action of the debris leads also to damages of the structural reinforcement. Therefore, selection of the repair materials is focused not only on the strength requirements, but also the abrasion resistance. On the other hand, there is very important that the...
It has been widely accepted that the microstructure and composition of human primary enamel differ from those of human permanent enamel. However, the difference of their erosion behaviour has not been fully understood. To extend the understanding of dental erosion, the surface properties of eroded human primary enamel and the possible remineralization influence of CPP-ACP were investigated in vitro...
Relevance of wear occurring in brakes increased with relation to the released chemicals and health and environmental hazards. Wear of brakes leads to formation of complex chemicals that are released into environment. Humidity can considerably modify the adhesion of surfaces by creating menisci and increasing the contact area. This paper addresses the impact of humidity on two commercial brake material...
The increasing demands for light-weight components in vehicles contribute to the global expansion of hot sheet metal forming technologies. Structural components are typically produced using hot stamping of ultra-high strength steel (UHSS). This process allows forming of complex shapes whilst enabling control of the mechanical properties of the end product. Interest in zinc coated UHSS has increased...
Metal-on-metal (MOM) hip joint bearings have demonstrated low wear rates. However, wear of MOM joints is a concern due to the toxicity and biological reaction of wear debris and dissolution by metallic corrosion. There is, therefore, considerable interest in further reducing the wear of MOM bearings for hip prostheses. The aim of the present study was to investigate the wear properties of surface...
Using a reciprocating ball-on-flat tribometer, the friction and wear behaviors of phosphate laser (PL) glass and BK7 borosilicate glass were investigated by rubbing against Al2O3 ball in dry air and liquid water to reveal the effect of water on the wear of the two glasses. In dry air, the wear of PL glass and BK7 glass shows a typical characteristic of mechanical wear. The damage of PL glass dominates...
In this work the influence of deep cryogenic treatment followed by a double tempering at 150°C on the erosive wear resistance of high velocity oxy-fuel (HVOF) WC-10Co-4Cr coating was evaluated. Cryogenically treated coatings exhibited a microstructural densification effect; more compact splats, lower porosity, and a clear redistribution of Co, enhancing its hardness with respect to that observed in...
The aim of the present study focuses on investigating the performance that sunflower and corn oils, added with 0.0125, 0.025, 0.05 and 0.1wt% of SiO2 nanoparticles, have when these are used as lubricants during Single Point Incremental Sheet Forming (SPIF) process of 6061 aluminum sheet alloys. In an attempt to explain the differences between friction conditions, the Stribeck curve was used to address...
The human body joint motion is very complicated, which mainly includes sliding, swing, rotation. Therefore, cartilage covering the joint surface bears the repeated friction which is caused by the different movements during the whole life. So sliding, swing and torsion friction behavior of hydrogels need to be researched as synthetic articular cartilage. In this paper, PVA/HA composite hydrogel is...
Continuous turning of Ti6Al4V with uncoated WC-Co cutting tool inserts mainly results in crater wear on the rake face of the tool. The crater is located close to the cutting edge and increases in size with increased time in cut. The flank wear remains minor until the point when the crater reaches a critical size so that the edge deforms plastically and edge breakage occurs. To understand the crater...
Sequentially crosslinked and annealed polyethylene (SXL) is a second generation highly crosslinked polyethylene that has been available for joint replacement with clinical success. The purpose of this study is to characterize SXL cups through an analysis of almost 14 years of historical in vitro wear simulation data. Three characteristics were evaluated in this study (1) Wear rate, (2) linear penetration...
The wear mechanism and life of the pivot jewel bearing in oil bath lubrication needs to be well understood. Forty five spinning wear test sets were built to reveal the wear behavior and wear life to achieve proper design of pivot bearing for high speed application such as in flywheels for energy storage, small centrifuges and fabric spindles. The ferrographic analysis of the used oil in wear test...
Extensive work was carried out to improve the performance of cast irons used for slurry transport in the oil sands industry. Because of complex condition of the multi-phase fluid containing oil sand particles, erosion-corrosion damage has long been an issue. High chromium cast irons (HCCIs) are currently used for slurry pumps, showing high resistance to sand-containing slurry erosion. However, further...
An artificial neural network (ANN) analysis is used to obtain a model to predict the rate of erosive wear of hard coatings deposited by two different kinds of thermal spray techniques. High Velocity Oxygen Fuel (HVOF) and Flame Spray FlexiCords (FS/FC) techniques were used under various operational conditions. Different microstructural features that control the mechanical and the tribological performances...
Aqueous suspensions containing different concentration of nano-TiO2 (50nm) are prepared, in which sodium polyacrylate (PAAS) as the dispersant is used. Their wettability and tribological properties are discussed with Dataphysics OCA50 contact angle measurement device and the MRS-10A four-ball tester, respectively. The rubbed surfaces after friction tests are also analyzed by scanning electron microscope...
Crystallization of carbides with high hardness in the matrix was proved to be effective to improve erosive wear characteristics under high temperature conditions. In the present study, molybdenum (Mo) with the ability to increase hardenability was added into high chromium cast iron. Erosive wear characteristics of six kinds of materials with 16, 26 mass % chromium (Cr) and 0, 1, 3 mass % Mo content...
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