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The pulverizer blade in food and animal feed production is subjected to abrasive wear from agricultural produce such as millet, corn, beans, rice husk and hull, resulting in the contamination of food by the wear debris from the blade material. This work compares different surface treatment and coating techniques used in improving the abrasive wear resistance of the blade, thus reducing the amount...
Lubricated bearing surfaces like those in engine connecting rods commonly experience transient loading in service. These transients can affect friction, wear rate, and regime of lubrication. It was therefore of interest to investigate the effects of periodically-varying loads on candidate bearing materials under non-steady-state conditions and running-in. Light weight titanium alloys could be used...
Carbon fibre reinforced plastics (CFRPs) are intensively used in aerospace applications due to their good strength to weight ratio. However, when subjected to solid particle erosion, wear rates of CFRP are more than one order of magnitude higher than steel. Protective coatings produced by physical vapour deposition (PVD) can increase the lifetime of CFRP components. In this work magnetron sputtering...
Friction-induced stick–slip of brake friction materials was investigated by examining the correlation between contact stiffness (k n ) and surface topography changed by material wear at the sliding interface. By changing the surface roughness and thickness of the friction material, friction instability during sliding at low speeds was analyzed using a scale brake dynamometer. The results showed...
In this study, Mg–3Al–1Zn alloys containing small amounts of yttrium (<4wt%) were prepared using an induction furnace. The corrosion resistance of as-cast alloys in a 3.5% NaCl solution was investigated by electrochemical polarization testing and their corrosive wear resistances in the same solution were evaluated using a pin-on-disc tester. Microstructures and worn surfaces of the alloys were...
The texture change during running-in alters the performance and efficiency of a tribo-mechanical system. During mass production of cylinder liners, a final finishing stage known as “plateau honing” is commonly added to reduce the running-in wear process of the liner surface. The majority of researchers think that this operation improves the engine efficiency and decreases oil consumption. It was believed...
Effects of humidity on the friction coefficients of brake friction materials at slow sliding speeds were studied. By measuring the static and dynamic coefficients of friction (COF) at high and low humidity levels, the mechanism of humidity-induced friction instability was investigated as functions of exposure time, applied pressure, and sliding speed. Tribological properties were examined using a...
Ti3Al3N ternary coatings processed by Physical Vapor Deposition (PVD) are frequently used in machining inserts particularly for the automotive and aerospace industries. They possess many good qualities generally required in a cutting tool and high metal removal rates can be achieved with them. (Ti 1−x Al x )N ternary coatings may form different crystalline structures (single cubic...
The application of high-pressure coolant (HPC) in cutting processes can strongly influence the wear on the cutting tools providing a longer tool life. This is possible due to better penetration of the fluid into the tool–workpiece and tool–chip contact region, providing a better cooling effect and decreasing tool wear through lubrication of the contact areas. To better understand the effect on tool...
As 75 up to 85% of the exhausted energy in mining and mineral processing industries is used for comminution processes, more energy efficient crushing technologies such as high pressure grinding rolls (HPGR) can help to reduce the consumption. Differing chemical compositions and physical properties of minerals due to origin and pre-treatment aggravate a wear prediction of the roller material, a key...
This research addresses the application of friction stir welding (FWS) of titanium alloy Ti–6Al–4V. Friction stir welding is a recent process, developed in the 1990s for aluminum joining; this joining process is being increasingly applied in many industries from basic materials, such as steel alloys, to high performance alloys, such as titanium. It is a process in great development and has its economic...
A simple test method has been developed to quantify the response of metals and alloys to two-body wet abrasion. A metallographic polishing machine was modified to create a disk-on-flat sliding test rig. Adhesive-backed SiC grinding papers were used under fixed load and speed to rank the abrasive wear of seven alloy steels, some of which are candidates for drill cones for geothermal drilling. Standardized...
Wear and fatigue properties of power transmission components are usually improved by various surface engineering processes. One surface modification process is shot peening which is generally carried out to improve bending fatigue. However there are contrasting studies meant to investigating whether shot peening actually increases the sliding wear resistance of austempered ductile iron (ADI). Unlubricated...
In jet engines the blade resonant vibration amplitude is normally reduced by increasing the structural damping by using, for example, tip shrouds. These devices dissipate the energy generated at the contact surfaces between the relative motion and the friction force. Contact parameters, principally the friction coefficient and contact stiffness, are required to characterize the dynamics of shrouded...
This paper concentrates on the tribological performance of the polymer aqueous solution poly(propylene oxide)–poly(ethylene oxide)–poly(propylene oxide), PPO–PEO–PPO. The adsorption process on the metal surface is significantly influenced by the concentration and structure of copolymer, and interaction between the copolymer/substrate. Experiments have been carried out to investigate the tribological...
In machining, tool–chip interface parameters such as pressure, temperature, sliding velocity and friction are extremely difficult to estimate only by experimental means. Theoretical methods can then give important solutions for predicting these quantities required for the assessment of tool wear. This work deals with a multi-steps modelling strategy based on several numerical calculations. The first...
Ductile materials commonly exhibit plastic deformation at and near the contact surface and their flow behaviour at large strain has a clear effect on wear resistance. These materials almost always fail while under high levels of compression, but behaviour under these conditions cannot be investigated by standard materials tests at atmospheric pressure. In this work, the characteristics of the near-surface...
This study is an investigation of tool wear using a ball-type end mill. The primary purpose of this work is to examine the tool life and wear mechanism when machining Inconel 718 with a physical vapor deposition (PVD)-coated carbide tool and varying the cutting parameters. Notch wear and flaking near the depth of the cut zone were the predominant types of tool failure for the four round cutting tools...
Coatings are applied to protect surfaces subjected to fretting wear in many contacts under oscillating motions. Among these contacts, failure of the coating is a major concern. In most studies, durability and wear properties of coatings have been investigated on the coatings sliding against their metal counterfaces. However, few studies have been made on situations such that coating sliding against...
In this study, the double sided lapping behavior of sapphire substrate using fixed diamond abrasive pad was evaluated. For the lapping process, fixed diamond abrasive pad is used along with the alumina slurry. Triethanolamine (TEA) is used as a dispersant for the alumina slurry. Sapphire removal rate increases with increase in alumina particle to dispersant ratio, lapping pressure and platen speed...
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